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Blaise, D.
- Allelopathic Potential and Allelochemicals in Different Intercrops for Weed Management in Rainfed Cotton
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Authors
Affiliations
1 ICAR-Central Institute for Cotton Research, Nagpur 440 010, IN
1 ICAR-Central Institute for Cotton Research, Nagpur 440 010, IN
Source
Current Science, Vol 120, No 6 (2021), Pagination: 1035-1039Abstract
Allelochemicals released by plants serve as the primary defence by targeting the establishment of weeds and other plants. In this study, 12 different intercrops were assessed over five seasons for total phenol and terpenoid content. A detailed analysis on allelochemi-cals produced was also done using gas chromatog-raphy–mass spectrometry (GC–MS) to correlate with their weed suppression efficiency. Total phenol con-tent of intercrops ranged from 6.5 to 17.6 mg g–1 tissue dry wt, with the highest value in carom followed by sorghum, sunnhemp and marigold. Total terpenoid content of leaf extracts of the intercrops varied from 14.5 to 35.9 μg g–1 tissue dry wt, wherein pearl millet had maximum terpenoid content (35.9 μg g–1 tissue dry wt) followed by sunnhemp and sesame. Analysis using GC–MS indicated the presence of some unique as well as common allelochemicals in the experimental intercrops. To correlate the abundance of these allelo-chemicals released from intercrops with their weed suppression competence, relative neighbour effect (RNE) value was determined for each intercrop. Posi-tive RNE values for sunnhemp, pearl millet and sesame indicate their efficiency in effectively reducing weed population than the other intercrops. Thus, in-tercrops with high phenolic, terpenoid and other alle-lochemicals specific to sunnhemp, pearl millet and sesame can be correlated well with weed suppression as perceptible from their RNE values.Keywords
Allelochemicals, Allelopathic Potential, In-Tercrops, Rainfed Cotton, Relative Neighbour Effect.Full Text
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- Nitrogen loss from plants – an ignored aspect
Abstract Views :161 |
PDF Views:70
Authors
Affiliations
1 ICAR-Central Institute for Cotton Research, Nagpur 441 108, IN
1 ICAR-Central Institute for Cotton Research, Nagpur 441 108, IN
Source
Current Science, Vol 121, No 5 (2021), Pagination: 613-614Abstract
No Abstract.Full Text
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- Physiological, biochemical and molecular manifestations in response to seed priming with elicitors under drought in cotton
Abstract Views :150 |
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Authors
Affiliations
1 ICAR-Central Institute for Cotton Research, Nagpur 441 108, India; Sam Higginbottom University of Agriculture, Technology and Sciences, Allahabad 221 007, India
2 ICAR-Central Institute for Cotton Research, Nagpur 441 108, India
3 Sam Higginbottom University of Agriculture, Technology and Sciences, Allahabad 221 007, India
1 ICAR-Central Institute for Cotton Research, Nagpur 441 108, India; Sam Higginbottom University of Agriculture, Technology and Sciences, Allahabad 221 007, India
2 ICAR-Central Institute for Cotton Research, Nagpur 441 108, India
3 Sam Higginbottom University of Agriculture, Technology and Sciences, Allahabad 221 007, India
Source
Current Science, Vol 123, No 5 (2022), Pagination: 658-666Abstract
Water stress has a detrimental effect on growth and development, which alters physio-biochemical activities. Seed priming with elicitors such as methyl jasmonate and paclobutrazol can mitigate the impact of drought stress. Therefore, pot-culture studies were conducted with drought-tolerant (DTS-155) and drought-susceptible (IC-357055) cotton genotypes to assess the seed priming effects of elicitors (methyl jasmonate and paclobutrazol) on the physio-biochemical changes and gene expression. The dose (50, 100, 150 and 200 mM) and time interval (1.5 and 2.5 h) experiments of both the elicitors were performed separately. On the basis of germination, seedling growth and vigour, a 150 mM elicitor for 1.5 h time interval was found to be the best. Biochemical and physiological parameters confirmed an increase in relative water content, total antioxidant activities, chlorophyll, superoxide dismutase, catalase and proline under drought stress in both the genotypes, but a decrease in lipid peroxidation. Among the elicitors, methyl jasmonate improved drought tolerance as compared to paclobutrazol. Gene expression studies with Rub-S, Rub-L and Osmotin confirmed the results. Transcript abundance of Osmotin and Rub-L was upregulated under drought stress in both the genotypes and was highest in methyl jasmonate primed samples. These findings suggest that priming with methyl jasmonate enhances drought tolerance in cottonKeywords
Drought responsive gene, Gossypium hirsu-tum, methyl jasmonate, paclobutrazol, seed primingFull Text
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Abstract Views :143 |
PDF Views:83
Authors
Affiliations
1 Department of Crop Production, ICAR-Central Institute for Cotton Research, Nagpur 440 010, India, IN
1 Department of Crop Production, ICAR-Central Institute for Cotton Research, Nagpur 440 010, India, IN
Source
Current Science, Vol 123, No 7 (2022), Pagination: 874-880Abstract
Soil compaction is a major physical constraint in cotton production. At present, no information is available on the effects of compaction on the root growth and root anatomy of cotton (Gossypium hirsutum L.). Therefore, we studied the effects of subsoiling (shallow (SSS) and deep (DSS)) and crop rotation (pigeon pea (Cajanus cajan) – cotton (PCR) and radish (Raphanus sativus) – cotton (RCR)) on the root growth of cotton in deep Vertisols during 2017–19. Subsoiling significantly increased the shoot and root length. The root-to-shoot ratio was maximum in DSS (33%), followed by PCR (29%) at the vegetative stage. Scanning electron microscopy analysis of the roots indicated a large number of pores and less contraction of xylem and phloem in the subsoiled and rotation treatments than in the control. Furthermore, the SEM-EDAX spectra indicated a greater abundance of major, secondary and micronutrients in subsoiling and crop rotations compared to the control treatmentFull Text
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