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KRISHNAN, ANU G.
- Assessment of Physico-Chemical Properties of Jackfruit Collections from Kuttanad Region of Kerala
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Authors
Affiliations
1 Regional Agricultural Research Station (K.A.U.), Kumarakom, Kottayam (Kerala), IN
2 Krishi Vigyan Kendra (K.A.U.), Kumarakom, Kottayam (Kerala), IN
1 Regional Agricultural Research Station (K.A.U.), Kumarakom, Kottayam (Kerala), IN
2 Krishi Vigyan Kendra (K.A.U.), Kumarakom, Kottayam (Kerala), IN
Source
The Asian Journal of Horticulture, Vol 10, No 2 (2015), Pagination: 262-266Abstract
Artocarpus heterophyllus Lam (Jackfruit) which belongs to the family Moraceae, is believed to be indigenous to the south western rain forest of India. It is an important component of homestead gardens in Kerala. A lot of variability exists among jack trees as most of them are raised from seedlings. Hence, a study was conducted at Regional Agricultural Research Station, Kumarakom during 2011-14 to assess the variation in fruit quality and bearing habit of jack trees grown under the agro climatic conditions of Kuttanad and to recommend the promising types of jack types suitable to this region. To identify the superior indigenous jackfruit types a survey work has been carried out in Kuttanad region and identified 21 firm fleshed jack types. Organoleptic test was conducted for these genotypes and selected 10 promising types with good sensory quality. Physico-chemical properties of these genotypes were evaluated. A significant variation in physico-chemical characters of jackfruit were observed among these jack selections. The physical characters of fruit such as individual fruit weight ranged from 1.69 to17.50 kg, bulb mass 0.80 - 10.25 kg, flake mass 0.64 – 6.62 kg, single bulb weight 13.20 - 48.36 g and flake thickness 0.31 - 0.63 cm. Similarly, the chemical parameters also varied significantly among these selections. The TSS varied from 12.60 - 31.80 °Brix, ascorbic acid 1.50 - 10.55 mg/ 100g, acidity 0.20 - 1.02 per cent, total sugar 20.84 - 61.88 per cent and reducing sugar 3.18 - 9.39 per cent. The selected superior jack types met the standard parameters for high quality fruits, and can be recommended for their performance and sustainable yield in such type of environment. These promising selections were propagated through patch budding and are maintained in our station as part of our germplasm conservation. The result of this study is a useful information for further crop improvement programmes in jack.
Keywords
Artocarpus heterophyllus Lam., Jack Fruit, Physico Chemical Properties.
- Estimation of Genetic Diversity in Nutmeg (Myristica fragrans Houtt.) Selections Using RAPD Markers
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Authors
Affiliations
1 Regional Agricultural Research Station (KAU), Kottayam (Kerala), IN
1 Regional Agricultural Research Station (KAU), Kottayam (Kerala), IN
Source
International Journal of Plant Sciences, Vol 12, No 2 (2017), Pagination: 102-107Abstract
Nutmeg (Myristica fragrans Houtt.) is an evergreen tree and popular spice. In the present study, Random Amplified Polymorphic DNA (RAPD) analysis was performed to assess the genetic diversity among the 19 superior accessions of nutmeg collected from different geographic locations and maintained in the germplasm collections of Regional Agricultural Research Station, Kumarakom, Kerala. This included one released variety IISR Viswasree. Out of 28 RAPD primers tested, 20 were amplified. Out of the 109 loci amplified, 82 were polymorphic with an average polymorphism rate of 72.74 per cent. The number of bands for each primer ranged from 2 to 8. The markers which produced maximum number of polymorphic bands were BB-18 and PO-5. PIC value of the markers ranging from 0.09 (OPA 11) to 0.48 (W-15) with an average of 0.31. The marker index (MI) varied between 0.09 and 2.08 with an average of 1.25. Jaccard’s similarity co-efficient of the genotypes ranged between 0.34-0.93. Dendrogram constructed based on UPGMA analysis grouped the 19 selected genotypes into two major clusters. The knowledge on genetic diversity of nutmeg can be used for further breeding programmes for getting higher nut and mace yield.Keywords
Nutmeg, Genetic Diversity, RAPD, Dendrogram.References
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- Sheeja, T.E., Sabeesh, C., Shabna, O.V., Shalini, R.S. and Krishnamoorthy, B. (2013). Genetic diversity analysis of Myristica and related genera using RAPD and ISSR markers. J. Spices Aromatic Crops, 22 (1) : 38-46
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- Tharachand, C., Immanuel, S.C. and Abraham, Z. (2015). Molecular insights into the genetic diversity of Garcinia cambogia germplasm accessions. Braz. Arch. Boil. Technol., 58(2):765-772.
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- Antagonistic Efficacy of Trichoderma Isolates Against Soil-Borne Plant Pathogens, Pythium Aphanidermatum and Rhizoctonia Solani
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Authors
Affiliations
1 Department of Plant Pathology, College of Agriculture, Vellayani, Thiruvanathapuarm – 695522, Kerala, IN
2 Regional Agricultural Research Station, Kumarakom, Kottayam – 686563, Kerala, IN
3 Department of Plant Pathology, College of Agriculture, Padannakkad, Kasaragod – 671 314, Kerala, IN
1 Department of Plant Pathology, College of Agriculture, Vellayani, Thiruvanathapuarm – 695522, Kerala, IN
2 Regional Agricultural Research Station, Kumarakom, Kottayam – 686563, Kerala, IN
3 Department of Plant Pathology, College of Agriculture, Padannakkad, Kasaragod – 671 314, Kerala, IN
Source
Journal of Biological Control, Vol 35, No 2 (2021), Pagination: 48-56Abstract
Trichoderma spp. are long been recognized as efficient fungal biocontrol agents for the control of plant disease and for their ability to increase plant growth and development. Management of soil borne diseases has become very much important since it causes high crop yield losses. The present study was carried out to isolate Trichoderma spp. from soil samples collected from different locations of Kerala and to test their in vitro efficacy against soil borne pathogens viz., Pythium aphanidermatum and Rhizoctonia solani. The Trichoderma spp. was isolated on Trichoderma Selective Medium (TSM) and observed that the isolates differed in radial growth and colony characters such as colony colour, texture and sporulation. In vitro studies revealed the potential of Trichoderma isolates against soil borne pathogens. Isolates TRPN3 and TRPN7 exhibited no sporulation and white mycelial colour. Isolates which completed their growth at four days after inoculation include TRKR1, TRPN3, TRPN7, TRPN10 and TRPN18. Biocontrol activities against different pathogens resulted in inhibition of pathogens. Maximum inhibition percentage was observed by the isolates TRPN7, TRPN15 and TRKR2 against both the pathogens. The maximum inhibition exhibited against both the pathogens is due to the antagonistic property displayed by the isolates.Keywords
Antagonistic Activity, Inhibition, Soil Borne Pathogens, Trichoderma Spp.Full Text
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