Physiological and reproductive behaviour of summer Mungbean [Vigna radiata (L.) Wilczek] under terminal heat stress

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dc.contributor.advisorNandwal, A.S.
dc.contributor.authorChand, Gurdev
dc.date.accessioned2017-06-03T04:04:20Z
dc.date.available2017-06-03T04:04:20Z
dc.date.issued2015
dc.description.abstractThe present investigation was carried out on three mungbean genotypes viz. MH 421, MH 318 and Basanti in the screen house during 2012-13 and 2013-14. High temperature induced changes for plant water status i.e. water potential (yw), osmotic potential (ys) and relative water content (RWC %), relative stress injury (RSI %), physiological parameters viz. total chlorophyll, chlorophyll stability index (CSI), chlorophyll fluorescence and canopy temperature depression (CTD), biochemical like malondialdehyde (MDA), total soluble carbohydrate (TSCs), proline accumulation, nitrogen content, antioxidant enzymes and protein profile were studied 3 and 7days after exposure (DAE) to high temperature (>35oC) and reproductive changes, yield attributing character, seed quality studies were taken at harvesting stage. The yw and ys of leaves became more negative from -0.66 to -1.97 and -1.01 to -1.87 MPa respectively, with increasing the days after exposure (DAE) to high temperature (>35°C). In the genotype MH 421, the value of yw (-1.59) and ys (-1.69) of leaf were more negative than MH 318 and Basanti. With the increased DAE, RWC of leaf declined from 73.65% to 63.41%. Total chlorophyll content (17.27 to 11.31 mg g-1 DW), SPAD (48.64 to 46.02) readings, CTD (-5.78 to -4.37: °-C) and CSI (81.01% to 67.36%) decreased with increased DAE to high temperature and decrease was more in Basanti and MH 318 than MH 421. RSI increased with increased DAE to high temperature; the increase more in Basanti (41.34%) followed by MH 318 (40.72%) than MH 421 (34.88%). MDA (21.75 to 34.44), TSCs (23.58 to 33.65 g g-1 DW) and proline content (3.11 to 17.77 mg g-1 DW) increased in all genotypes with increased DAE; the increase MDA, being more in leaves of Basanti (30.66 μ mol g-1DW) followed by MH 318 (28.97) than MH 421 (28.26). The TSCs and proline content were maximum in MH 421 (33.83 mg g-1 DW and 25.21 mg g-1 DW) followed by MH 318 (30.08 and 23.75) than Basanti (28.26 and 22.19) respectively. Moreover the RWC (%) and Osmotic adjustment (OA) were also better in MH 421under high temperature stress. High temperature induced the specific activity of antioxidant enzymes such as superoxide dismutase (SOD) (3.37 to 5.67), catalase (CAT) (7.40 to 11.48), peroxidase (POX) (10.09 to 21.95), ascorbate peroxidase (APX) (0.35 to 1.56), Glutathione peroxidase (GPX) (0.39 to 0.61), Glutathione transferase (GST) (0.22 to 0.80). The antioxidant i.e. total glutathione (409.49 to 513.09) and hydrogen peroxide (H2O2) (1.53 to 1.82) were enhanced while ascorbic acid (AAC) (25.20 to 16.88) and caroteonoid content (4.61 to 2.30) were decreased with increased DAE to high temperature. The specific activity of above said enzymes was maximum in MH 421 followed by MH 318 and minimum in Basanti at all the DAE to high temperature. The total glutathione, ascorbate and caroteonoid content were higher in MH 421 as compared to other genotypes while reverse trend was seen for H2O2 content.en_US
dc.identifier.urihttp://krishikosh.egranth.ac.in/handle/1/5810014706
dc.language.isoenen_US
dc.publisherCCSHAUen_US
dc.subPlant Physiology
dc.subjectgenotypes, planting, biological phenomena, proteins, tolerance, enzymes, irrigation, developmental stages, yields, sowingen_US
dc.these.typePh.D
dc.titlePhysiological and reproductive behaviour of summer Mungbean [Vigna radiata (L.) Wilczek] under terminal heat stressen_US
dc.typeThesisen_US
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