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Bhattacharya, D.

• Three-Phased Temporal Evolution of the Jhirgadandi Granite Complex, Sonbhadra District, Uttar Pradesh

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Authors

Anand Kumar Srivastava ¹, Gopendra Kumar ², D. Bhattacharya ³

Affiliations
1 Department of Geology, Lucknow University, Lucknow, IN
2 48 Pandariba, Lucknow - 226 004, IN
3 AMD/DAE, NR, West Block - 7, R K Puram, New Delhi - 110 066, IN

Source

Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 72, No 2 (2008), Pagination: 281-282

Abstract

No Abstract.

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• A Note on Carbonate Rock with Igneous Affinity from Jungel Valley, Sonbhadra District, Uttar Pradesh, Central India

Abstract Views :221  |  PDF Views:3

Authors

D. Bhattacharya ¹, Madhuparna Roy ¹, Dhirendra Kumar ², Pawan Misra ¹

Affiliations
1 Atomic Minerals Directorate for Exploration and Research, NR, New Delhi - 110 066, IN
2 Flat No. B-170, Kendnya Vihar, Sector-51, Noida, IN

Source

Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 71, No 6 (2008), Pagination: 808-814

Abstract

The Lower Proterozotc (1800-2400 Ma) Jungel Valley mafic-ultramatic complex (JVMUC) is an integral pait of Mahakoshal greenstone belt in district Sonbhadra. The complex is known for its diversity of locks like alkali olivine basalt, kimbeihte and ultramalic lamprophyre. In addition to these, a carbonate rich rock having igneous affinity is being reported for the first time from this complex High CaO, CO₂, Sr and Ce with low SiO,, A1₂O₈ and TiO₂ characterise this rock. However, these rocks are not significantly enriched in incompatible elements and REE, implying that these may have possibly formed by partial melting of a depleted mantle at shallow depth. The geochemical characters combined with association of mantle derived rocks, presence of high level of carbonate in the lamprophyre and absence of sedimentary limestone in the area point towards an igneous origin, probably as a residual concentrate of a differentiated Kimberlite-Ultramahc lamprophyre sequence Sr isotope data, which fall well within the range of reported carbonatites of India, suggest moderate crustal contamination. The mafic-ultramafic suite together with the carbonate rocks developed in Son-Naimada nit zone are interpreted to be coeval with the intrusive syenite pluton, alkali gabbio and lamprophyres of the adjoining areas and is related to the development of Mahakoshal greenstone belt.

Keywords

Jungel Valley, Caibonate Lamprophyre, Mahakoshal Greenstone Belt, Uttar Pradesh.

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• Three-Phased Temporal Evolution of the Jhirgadandi Granite Complex, Sonbhadra District, Uttar Pradesh

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Authors

D. Bhattacharya ¹, Madhuparna Roy ¹, G. B. Joshi ¹

Affiliations
1 Atomic Minerals Directorate for Exploration and Research, New Delhi-11 0066, IN

Source

Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 70, No 5 (2007), Pagination: 730-744

Abstract

Field observations, petromineralogical and geochemical studies on the locks of Jhirgadanpdi pluton indicate three phases of igneous activity, compositionally ranging from gianodiorite, Quartz-Monzonite to granite. The wide spread intermediate phase of this suite shows anomalous concentration of U, Ce and Th as compared to average granite and enrichment of K, Rb, Ba relative to Zr, Nb and Y. The radioactive minerals identified are thorite, uranothorite, allanite monazite and samaiskite Molybdenite and chalcopyite are the other are minerals Presence of REE (1 are earth element) minerals, distibution pattern of LIL (large Ion lithophile) elements, various elemental ratios and increasing metaluminous tendency indicate moderate degree of differentiation Petromineralogical study of rocks suggests partial melting of a magic source of lower crustal rocks Geochemical data suggests that the granitic rocks of the three phases are comagmatic. Available age data together with tectonic considerations indicate that the magmatic activity is relaled to the development of Mahakoshal greenstone belt which might have culminated with the emplacement of Post-Tectonic Jhirgadandi sulte (∼ 1800 Ma), possibly under the influence of a mantle plume.

Keywords

Jhirgadandi Granite Post-Tectonic, Mantle Plume Radloactive Minerals Sonbhadra District, Uttar Pradesh

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• Geochronology of the Granitoids of the Kunjar Area, Sundergarh District, Orissa: Implications to the Regional Stratigraphy

Abstract Views :214  |  PDF Views:4

Authors

A. Chaki ¹, D. Bhattacharya ², J. S. Rao ³, A. K. Chaturvedi ³, A. K. Bagchi ³

Affiliations
1 Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy Bangalore - 560 072, IN
2 Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy NewDelhi - 110 066, IN
3 Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy Hyderabad 500 016, IN

Source

Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 65, No 4 (2005), Pagination: 428-440

Abstract

Rb-Sr isotopic data for the Tamparkola granite, northwest of Bonaigarh, and Bamra granite, southeast of Barnra, Sundergarh district, Orissa have yielded similar ages of 2746&#177144 Ma and 2738±28 Ma, respectively. Small granite exposures intruding the Iron Ore Group in the southern part of Tamparkola granite, have also indicated similar Whole Rock Rb-Sr age of 2867&#17786 Ma. These may be correlated with the Bonai granite. Significant crustal component was involved in the generation of these granites, as indicated by high initial Sr ratio, and their emplacement probably marks a major terminal cratonisation event in northwestern part of the Singhbhum-North Orissa Craton.

Ths study does not support the view that the Tamparkola Granite is equivalent to the Itrna/Ekma granites that are intrusive into the Gangpur Group. These age results call for a revision of the stratigraphy of the Bonai-Gangpur tract, in that the Darjing Group unconformably overlies both the Bonai granite and Tamparkola granite, with the Mesoproterozoic Kunjar sedimentary sequence representing the youngest of the regional succession.

Keywords

Rb-Sr isotopics, granites, stratigraphy, Kunjar basin, Darjing Group, Gangpur Group, Sundergarh District, Orissa.

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• On the Occurrence of Rocks of Lamproitic Affinity in Singhbhum Granite, near Rajnagar-Tiring Area, District East Singhbhum, Jharkhand

Abstract Views :178  |  PDF Views:130

Authors

Aniruddha Basu ¹, L. K. Das ¹, M. Moitra ¹, D. Bhattacharya ¹, A. K. Lahiri ¹

Affiliations
1 Marine Wing (HQ). GSI, Kolkata, Bhubijnan Bhawan, Karunamoyee, Salt Lake, Kolkata - 700 091, IN

Source

Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 66, No 1 (2005), Pagination: 15-16

Abstract

This note records the occurrence of a lamproitic body traversing the Archaean greenstone belt in Singhbhum craton near Rajnagar-Tiring area in east Singhbhum district of Jharkhand. This discovery opens up new vistas of search for similar rocks in this region.

Keywords

Lamproites, Singhbhum Granite, Rajnagar Tiring Area, Jharkhand.

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• Three-Phased Temporal Evolution of the Jhirgadandi Granite Complex, Sonbhadra District, Uttar Pradesh

Abstract Views :194  |  PDF Views:115

Authors

S. Viswanathan ¹, D. Bhattacharya ²

Affiliations
1 Flat B-203, Block-B, Unite Avenue Apts, South End, 7-1-29, Ameerpet, Hyderabad - 500 016, IN
2 AMD/DAE, NR West Block-7, R K Puram, New Delhi - 66, IN

Source

Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 71, No 3 (2008), Pagination: 437-438

Abstract

No Abstract.

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• A Note on the Uranium Mineralisation along Jamual-markundi Fault, Sonbhadra and Sidhi Districts, Uttar Pradesh and Madhya Pradesh

Abstract Views :188  |  PDF Views:2

Authors

D. Bhattacharya ¹, G. B. Joshi ¹, G. S. Sharma ², D. B. Sen ³

Affiliations
1 Atomic Minerals Directorate for Exploration and Research, New Delhi-110066, IN
2 Atomic Minerals Directorate for Exploration and Research, Jaipur -302030, IN
3 Atomic Minerals Directorate for Exploration and Research, 313/4, Sector-56, Rail Vihar, Gurgaon, Haryana, IN

Source

Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 71, No 1 (2008), Pagination: 125-128

Abstract

Surface indications of uranium mineralisation associated with ferruginised brecciated rocks is traceable, intermittently, over a strike length of 25 km, exposed along the Jamual -Markundi Fault (JMF), at the tectonic contact of Neo- to Meso-Proterozoic Vindhyan Supergroup and Paleo-Proterozoic Mahakoshal Group between Gurdah and Mohariya, Sonbhadra and Sidhi districts of U.P. and M.P. respectively. Preliminary investigations reveal uranium (U₃O_g) content upto 610 ppm with little or no ThO₂. Uranium occurs in adsorbed state in the ferruginised groundmass of brecciated rock and probably related to hydrothermal activity. This is the first reported uranium occurrence from this unconformity related geological set up in the Son valley.

Keywords

Uranium mineralisation, Unconformity, Jamual-Markundi fault, Son-valley, U.P., M.P.

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• Growth of Population of India and Pakistan, 1801-1961

Abstract Views :448  |  PDF Views:0

Authors

P. C. Mahalanobis , D. Bhattacharya

Source

Artha Vijnana: Journal of The Gokhale Institute of Politics and Economics, Vol 18, No 1 (1976), Pagination: 1-10

Abstract

Undivided India in 1941 had an area of 1,582,989 square miles. The share of India and Pakistan together in 1941 was 3.03 per cent of the area and 17.30 per cent of the population of the world, and 15.9 per cent of the area and 32.10 per cent of the population of Asia. The share of area remained much the same, but the share of population had decreased slightly to 16.92 per cent of the world, and 31.14 per cent of Asia in 1961.

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• Trend of Wages in India (1873-1900)

Abstract Views :327  |  PDF Views:0

Authors

D. Bhattacharya

Source

Artha Vijnana: Journal of The Gokhale Institute of Politics and Economics, Vol 7, No 3 (1965), Pagination: 202-212

Abstract

The purpose of this paper is to show the trend of money-wages and real-wages in India during the last quarter of the nineteenth century. The bulk of the data used here are those obtained in the official series of prices and wages in India issued from 186l. Wage rates for three undermentioned categories of workers are available systematically from 1873 onward.

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• Efficacy of Certain Species of Trichoderma against Blight of Vigna radiata

Abstract Views :168  |  PDF Views:2

Authors

D. Bhattacharya ¹, M. R. Chakraborty ², N. C. Chatterjee ³, C. Sengupta ¹

Affiliations
1 Department of Botany, Kalyani University, Kalyani (W.B.), IN
2 Department of Botany, Bankura Christian College, Bankura (W.B.), IN
3 Department of Botany, Burdwan University, Burdwan (W.B.), IN

Source

International Journal of Plant Protection, Vol 9, No 1 (2016), Pagination: 8-14

Abstract

Alternaria sp attacks Vigna radiata causes many losses in yield. The antagonistic efficiency of Trichoderma spp evaluated in in vitro and in in vivo study against blight disease of Vigna. Trichoderma had shown significant antagonistic activity against Alternaria. Trichoderma species were capable of producing some volatile and nonvolatiles substances which inhibit the growth of the pathogen. Effect of non-volatile substances seems to be more effective on mycelial growth of the pathogen. T. viride was most promising to check the radial growth of the pathogen (100%) wherein T. harzianum exhibited 97.78 per cent inhibition. Studies on the production of hydrolytic enzymes viz., β-1, 3 glucanase and chitinase by four Trichoderma spp were also studied. Field trials with the application of two Trichoderma species were made where T. viride caused reduction of infection of plants to 54.11per cent.

Keywords

Alternaria, Chitinase, Laminarinase, Non-Volatile, Volatile, Trichoderma spp. Vigna.

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• Cadmium-Zinc-Telluride Imager On-Board Astrosat:A Multi-Faceted Hard X-Ray Instrument

Abstract Views :229  |  PDF Views:83

Authors

A. R. Rao ¹, D. Bhattacharya ², V. B. Bhalerao ², S. V. Vadawale ³, S. Sreekumar ⁴

Affiliations
1 Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005, IN
2 Inter-University Centre for Astronomy and Astrophysics, Pune 411 007, IN
3 Physical Research Laboratory, Ahmedabad 380 009, IN
4 Vikram Sarabhai Space Centre, Thiruvananthapuram 695 024, IN

Source

Current Science, Vol 113, No 04 (2017), Pagination: 595-598

Abstract

The AstroSat satellite is designed to make multi-waveband observations of astronomical sources and the Cadmium-Zinc-Telluride Imager (CZTI) instrument of AstroSat covers the hard X-ray band. CZTI has a large area position-sensitive hard X-ray detector equipped with a coded aperture mask, thus enabling simultaneous background measurements. Ability to record simultaneous detection of ionizing interactions in multiple detector elements is a special feature of the instrument, and this is exploited to provide polarization information in the 100-380 keV region. CZTI provides sensitive spectroscopic measurements in the 20-100 keV region, and acts as an all-sky hard X-ray monitor and polarimeter above 100 keV. During the first year of operation, CZTI has recorded several gamma-ray bursts, measured the phase-resolved hard X-ray polarization of the Crab pulsar, and the hard X-ray spectra of many bright galactic X-ray binaries. The excellent timing capability of the instrument has been demonstrated with simultaneous observation of the Crab pulsar with radio telescopes like Gaint Metrewave Radio Telescope and Ooty Radio Telescope.

Keywords

All-Sky Hard X-Ray Monitor, Gamma-Ray Bursts, Neutron Stars, X-Ray Polarization.

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References

• Singh, K. P. et al., AstroSat mission. In Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series: Space Telescopes and Instrumentation 2014: UV to Gamma Ray, at Montreal, 2014, vol. 9144, 91441S (p. 15).
• Bhalerao, V. et al., The Cadmium–Zinc–Telluride Imager on AstroSat. JAA, 2017, 38, 31.
• Bhalerao, V., Bhattacharya, D., Rao, A. R. and Vadawale, S., GRB151006A: AstroSat CZTI detection. GRB Coordinates Network, 2015, 18422, 1.
• Rao, A. R. et al., AstroSat CZT Imager observations of GRB151006A: timing, spectroscopy, and polarization study. ApJ, 2016, 833, 86.
• Bhalerao, V. et al., LIGO/Virgo G211117: AstroSat CZTI upper limits. GRB Coordinates Network, 2016, 19401, 1.
• Bhalerao, V., Bhattacharya, D., Rao, A. R. and Vadawale, S., GRB170105A: AstroSat CZTI localisation. GRB Coordinates Network, 2016, 20412, 1.
• Chattopadhyay, T., Vadawale, S. V., Rao, A. R., Sreekumar, S., and Bhattacharya, D., Prospects of hard X-ray polarimetry with AstroSat–CZTI. Exp. Astron., 2014, 37, 555.
• Vadawale, S. V. et al., Hard X-ray polarimetry with AstroSat–CZTI. Astron. Astrophys., 2015, 578, A73.
• Buhler, R. and Blandford, R., The surprising Crab pulsar and its nebula: a review. Rep. Prog. Phys., 2014, 77(6), 066901.
• Lyne, A. G., Pritchard, R. S. and Graham-Smith, F., Twenty-three years of Crab pulsar rotational history. MNRAS, 1993, 265, 1003.

• Multi-Colour Hues of the Universe Observed with AstroSat

Abstract Views :214  |  PDF Views:77

Authors

K. P. Singh ¹, D. Bhattacharya ²

Affiliations
1 Department of Astronomy and Astrophysics, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005, IN
2 Inter-University Centre for Astronomy and Astrophysics, Post Bag 4, Ganeshkhind, Pune 411 007, IN

Source

Current Science, Vol 113, No 04 (2017), Pagination: 602-609

Abstract

India's space astronomy observatory AstroSat was launched on 28 September 2015, carrying instruments to observe cosmic sources over a large spectral band, from optical/UV to hard X-rays. The mission, with all its payloads, has been operating successfully since its launch. After an initial period of performance verification and calibration, the satellite is now in full science operation. This article gives a brief introduction about the capabilities of the mission and presents some of the early science results.

Keywords

Active Galaxies, Cosmic Sources, Multi-Wavelength Astronomy, Multi-Colour Hues, Supernova Remnants.

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References

• Singh, K. P. et al., ASTROSAT mission. In Proceedings of SPIE, Space Telescopes and Instrumentation 2014: UV to Gamma Ray (eds Takahashi, T., den Herder, J.-W. A. and Bautz, M.), 2014, vol. 9144, pp. 91441S-1 to S-15 Montreal; doi: 10.1117/12.2062667.
• Bhalerao, V. et al., The cadmium zinc telluride imager on AstroSat. JApA, 2017, 38, 31–40.
• Ramadevi, M. C. et al., Early in-orbit performance of scanning sky monitor onboard AstroSat. J. Astrophys. Astr, 2017, 38, 32–34.
• Singh, K. P. et al., In-orbit performance of SXT aboard AstroSat. In Proceedings of SPIE, Space Telescopes and Instrumentation 2016: Ultraviolet to Gamma Ray (eds den Herder, J.-W. A., Takahashi, T. and Bautz, M.), 2016, vol. 9905, pp. 99051E-1 to E-10; doi:10.1117/12.2235309.
• Singh, K. P. et al., Soft X-ray focusing telescope aboard AstroSat: design, characteristics and performance. J. Astrophys. Astr., 2017, 38, 29.
• Subramaniam, A. et al., In-orbit performance of UVIT on ASTROSAT. In Proceedings of SPIE, Space Telescopes and Instrumentation 2016: Ultraviolet to Gamma Ray (eds den Herder, J.-W. A., Takahashi, T. and Bautz, M.), 2016, vol. 9905, pp. 99051F-1 to F-10; doi:10.1117/12.2235271 (arxiv: 1608.01073).
• Tandon, S. N. et al., In-orbit performance of UVIT and first results. J. Astophys. Astr., 2017, 38, 28.
• Vadawale, S. V. et al., In-orbit performance AstroSat CZTI. In Proceedings of SPIE, Space Telescopes and Instrumentation 2016: Ultraviolet to Gamma Ray (eds den Herder, J.-W. A., Takahashi, T. and Bautz, M.), 2016, vol. 9905, pp. 99051G-1 to G-11.
• Yadav, J. S. et al., In Proceedings of SPIE Space Telescopes and Instrumentation 2016a: Ultraviolet to Gamma Ray (eds den Herder, J.-W. A., Takahashi, T. and Bautz, M.), 2016, vol. 9905, pp. 99051D; doi:10.1117/12.2231857.
• Subramaniam, A. et al., A hot companion to a blue straggler in NGC 188 as revealed by the ultra-violet imaging telescope (UVIT) on AstroSat. ApJL, 2016, 833, L27–L31.
• Tandon, S. N., Ghosh, S. K., Hutchings, J., Stalin, S. and Subramaniam, A., Ultraviolet Imaging Telescope (UVIT) on AstroSat. Curr. Sci., 2017, 113(4), 583–586.
• Chattopadhyay, T., Vadawale, S. V., Rao, A. R., Sreekumar, S. and Bhattacharya, D., Prospects of hard X-ray polarimetry with Astrosat-CZTI. Experiment. Astr., 2014, 37, 555–577.
• Rao, A. R. et al., AstroSat CZT imager observations of GRB 151006A: timing, spectroscopy, and polarization study. ApJ, 2016, 833, 86–95.
• Yadav, J. S. et al., AstroSat/LAXPC reveals the high-energy variability of GRS 1915+105 in the X class. ApJ, 2016, 833, 27–35.
• Misra, R. et al., AstroSat/LAXPC observation of Cygnus X-1 in the hard state. ApJ, 2017, 835, 195–200.
• Singh, K. P., Dewangan, G. C., Chandra, S., Bhattacharayya, S., Chitnis, V., Stewart, G. C. and Westergaard, N. J., Soft X-ray focusing telescope aboard AstroSat: early results. Curr. Sci., 2017, 113(4), 587–590.
• Buhler, R. and Blandford, R., The surprising Crab pulsar and its nebula: a review. Rep. Prog. Phys., 2014, 77, 066901 (pp. 15).
• Fabian, A. C., Willingale, R., Pye, J. P., Murray, S. S. and Fabianno, G., The X-ray structure and mass of the Cassiopeia A supernova remnant. MNRAS, 1980, 193, 175–188.
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• Levenson, N. A., Graham, J. R. and Snowden, S. L., The Cygnus loop: a soft-shelled supernova remnant. ApJ, 1999, 526, 874–880.

• Design Antenna Using Fractal Geometries & Conductive Thin Films

Abstract Views :94  |  PDF Views:0

Authors

D. Bhattacharya ¹, R. Prasanna ¹

Affiliations
1 School of Electrical Engineering, Vel Tech Dr. RR & Dr. SR Technical University, IN

Source

International Journal of Engineering Research, Vol 2, No 4 (2013), Pagination: 278-281

Abstract

The use of fractal geometries has significantly impacted many areas of science and engineering; one of which is antenna. Designing antenna using fractal geometries has been shown to improve several antenna features. Moment method based simulation code was applied to perform a detailed parametric study for H-Shape model. The use of this model reduces the size of a resonant antenna compared with square antenna. This model is studied as single element and arrays which shows improvement in antenna gain.

Keywords

Fractal, H-Shaped, Conductive Thin Film, Polyacetylene Polypyrrole and Poly P-Phenylene-Benzobis-Thiazole.

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• Bandwidth Enrichment for Micro-Strip Patch Antenna Using Pendant Techniques

Abstract Views :104  |  PDF Views:0

Authors

D. Bhattacharya ¹, R. Prasanna ¹

Affiliations
1 School of Electrical Engineering, Vel Tech Dr. RR & Dr. SR Technical University, IN

Source

International Journal of Engineering Research, Vol 2, No 4 (2013), Pagination: 286-289

Abstract

A probe feed, slotted hexagonal patch antenna has been proposed. Bandwidth enhancement has been improved by suitably cutting slots into hexagonal patch. Proposed antenna is suitable for various telecoms, LAN, Wi-Fi applications in ISM-band. It is demonstrated that the proposed antenna exhibits resonance in ISM-Band and a peak gain of 6dBi. The antenna structure is described and simulated results are presented.

Keywords

Microstrip Patch Antenna, Band Width Enhancement, Gain, Dielectric Substrate, Simulation.

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• Nanowired Polymer Thin Film Solar Cells

Abstract Views :119  |  PDF Views:0

Authors

K. Siddappa Naidu ¹, D. Bhattacharya ¹, Vijay Albert William ¹

Affiliations
1 School of Electrical Engineering, Vel Tech Dr. RR & Dr. SR Technical University Avadi, Chennai-600062, Tamil Nadu, IN

Source

International Journal of Scientific Engineering and Technology, Vol 2, No 12 (2013), Pagination: 1198-1203

Abstract

The aspiration of the paper is to build up materials and processing techniques that will allow the production of low-cost multi-junction solar cells entirely by solution-processing or other low-cost techniques amenable to roll-to-roll (R2R) fabrication such as lamination. Device modeling will help identify the best device structural design. Amalgamation of different types of materials (metals, oxides, semiconductors, polymers) is one of the goals of this project.

Keywords

Photothermal Deflection Spectroscopy (PDS), Nanowire, Nanopyramids, Heterojunction Solar Cells.

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• Diversity and Ecology of Plant Mites and Damages Caused by them on Ornamental and Garden Plants in South Bengal

Abstract Views :241  |  PDF Views:108

Authors

A. K. Sanyal ¹, S. K. Gupta ², B. J. Sarkar ¹, D. Bhattacharya ¹

Affiliations
1 Zoological Survey of India, Kolkata 700053, IN
2 Anandam Housing Complex, 1C/10, 7, K. B. Sarani, Kolkata-700080, IN

Source

Records of the Zoological Survey of India - A Journal of Indian Zoology, Vol 113, No 3 (2013), Pagination: 109-112

Abstract

Flowers and leafy ornamentals have in India immense values in socio-cultural-religious aspects apart from having a good deal of commercial values both in domestic and export markets. India has 2,32,540 ha under flower cultivation with production of 4,59,156 tonnes of loose flowers and 1,15, 613 cut flowers (Chadha, 2010 and Gupta, 2012).

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• Unusually High Frequency of Cross-Pollination Between Rice Landraces Shiuli and Kharah with Coincident Flower-Opening Times

Abstract Views :201  |  PDF Views:85

Authors

Debal Deb ¹, D. Bhattacharya ¹

Affiliations
1 Centre for Interdisciplinary Studies, 186A Kalikapur Canal Road, Kolkata 700 099, IN

Source

Current Science, Vol 121, No 1 (2021), Pagination: 121-126

Abstract

Cross-pollination in cultivated rice (Oryza sativa L.) is rarely reported to exceed 2%. This low cross-pollination frequency (CPF) is conducive to success-fully maintaining the purity of rice landraces for many generations. We were therefore surprised to notice a dramatic loss of genetic purity in some of the pure line landraces in many farmers’ fields. Having ruled out the possibility of mixing of seeds from dif-ferent varieties, we surmised this rapid loss of genetic purity to be due to a somewhat higher degree of cross-pollination, and conducted a carefully designed expe-riment with suitably chosen pairs of landraces. We report here an unusually high (>81%) CPF seen in a pair of landraces whose flower opening times (FOTs) were coincident. Our control experiment on a pair of landraces with non-overlapping FOTs failed to detect any cross-pollination. This preliminary report sug-gests that the crucial importance of FOT diversity in landraces in determining CPF has not been recognized in designs of previous reports of crossing experiments, resulting in a severe underestimation of CPF in cultivated rice under natural conditions.

Keywords

Cross-Pollination Frequency, Flower Opening and Closing Times, Genetic Purity, Pollen Viability, Rice Landraces.

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References

• Endo, T., Sato, H., Yamaguchi, M., Kataoka, T., Nakagomi, K., Ito, T. and Mori, K., Estimate of outcrossing rates in a rice plant (Oryza sativa L.) under field conditions using a purple grain rice cultivar, Okunomurasiki. Breed. Sci., 2009, 59, 195–202.
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