Physiological and biochemical basis of high temperature stress tolerance and its amelioration in bell pepper (Capsicum annuum L. var. grossum)

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dc.contributor.advisorGhai, Navita
dc.contributor.authorTejinder Preet
dc.date.accessioned2021-02-09T07:24:41Z
dc.date.available2021-02-09T07:24:41Z
dc.date.issued2020
dc.description.abstractThe present investigation was carried out to evaluate the role of plant growth regulators viz. Salicylic acid (SA) and 24-epibrassinolide (EBR) on the physiological and biochemical parameters of bell pepper (Capsicum annuum L.). Two cultivars of bell pepper viz. hybrid Indra and variety Royal Wonder were selected for the study along with Punjab Sindhuri (hot pepper) used as a tolerant check for heat tolerance. Three concentration of each growth regulator, SA (0.10 mM, 0.20 mM and 0.50 mM) and EBR (0.05 µM, 0.10 µM and 0.20 µM) were applied in the form of foliar spray to both the cultivars at three growth stages, vegetative bud stage (30 DAT), reproductive stage (60 DAT) and post-reproductive stage (90 DAT). All the concentrations of PGRs were effective in imparting thermotolerance in terms of improved growth parameters (plant height, plant spread and leaf area), membrane thermostability, photosynthetic parameters (total chlorophyll content, carotenoid content and hill reaction activity), levels of total soluble sugars, starch, proteins, proline, enhanced antioxidant system (CAT, APX, POX, SOD and GR), fruit parameters (fruit length, fruit width, pericarp thickness and fruit chlorophyll). Application of SA and EBR resulted in reduced lipid peroxidation in leaf tissue and cellulase activity in pedicel of flowers, causing more retention of flowers, increased pollen viability and fruit set percent even at high temperature ultimately resulting in improved yield. Appearance of some new bands during SDS-PAGE of proteins in treated plants pointed towards the foundation of HSPs which helped the plants to survive under stressful conditions. Foliar spray of 0.10 µM EBR in hybrid Indra and 0.20 mM in variety Royal Wonder done at reproductive stage (60 DAT) and vegetative bud stage (30 DAT), respectively, were most effective in ameliorating the effects of high temperature stress.en_US
dc.identifier.citationTejinder Preet (2020). Physiological and biochemical basis of high temperature stress tolerance and its amelioration in bell pepper (Capsicum annuum L. var. grossum) (Unpublished Ph.D. Dissertation). Punjab Agricultural University, Ludhiana, Punjab, India.en_US
dc.identifier.urihttps://krishikosh.egranth.ac.in/handle/1/5810161048
dc.keywordsBell pepper, 24-Brassinolide, Salicylic acid, High temperature, Yield.en_US
dc.language.isoEnglishen_US
dc.pages100en_US
dc.publisherPunjab Agricultural University, Ludhianaen_US
dc.research.problemPhysiological and biochemical basis of high temperature stress tolerance and its amelioration in bell pepper (Capsicum annuum L. var. grossum)en_US
dc.subBotanyen_US
dc.themePhysiological and biochemical basis of high temperature stress tolerance and its amelioration in bell pepper (Capsicum annuum L. var. grossum)en_US
dc.these.typePh.Den_US
dc.titlePhysiological and biochemical basis of high temperature stress tolerance and its amelioration in bell pepper (Capsicum annuum L. var. grossum)en_US
dc.typeThesisen_US
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