Mitigating heat stress through plant growth regulators in tomato (Solanum lycopersicum L.)

dc.contributor.advisorGhai, Navita
dc.contributor.authorBhatia, Jaya
dc.date.accessioned2022-07-30T13:11:31Z
dc.date.available2022-07-30T13:11:31Z
dc.date.issued2021
dc.description.abstractThe present investigation was carried out to study the effect of GA3 and 4-CPA in mitigating heat stress in tomato (Solanum lycopersicum L.). Three cultivars of tomato viz. Punjab Ratta, Punjab Varkha Bahar-4 and LST-6 were selected for the study. Plant growth regulators are known to ameliorate the effects of elevated temperature through improving fruit set% and pollen viability thereby enhancing yield. Foliar application of GA3 (10, 20 and 30µg/ml) was done after three weeks of transplanting and application of 4-CPA (15, 45 and 75 µg/ml) was done at anthesis stage. Observations on morphy-physiological parameters, biochemical parameters and yield attributes were recorded at the interval of 10 days after treatment i.e between 30 to 70 days after transplanting (DAT). Application of GA3 and 4-CPA helped the plant to survive in heat stress by imparting thermo tolerance. Improvement in plant height, leaf area, chlorophyll content, carotenoid content, Hill reaction activity in leaf chloroplasts, total soluble proteins, total phenols, total soluble sugars and starch content was observed in treated plants as compared to controls. GA3 and 4-CPA also increased the cell membrane stability, proline content and lowered the lipid peroxidation in leaves. Along with this enhanced amount of lycopene content, titratable acidity% and total soluble solids were also recorded in tomato fruits. The increase in fruit set% and pollen viability was observed with the application of GA3 and 4-CPA which gradually resulted in increased number of fruits per plant and yield. The application of 75 µg/ml 4-CPA was most effective.en_US
dc.identifier.citationBhatia, Jaya (2021). Mitigating heat stress through plant growth regulators in tomato (Solanum lycopersicum L.) (Unpublished M.Sc. thesis). Punjab Agricultural University, Ludhiana, Punjab, India.en_US
dc.identifier.urihttps://krishikosh.egranth.ac.in/handle/1/5810185929
dc.keywordsTomato, GA3, 4-chlorophenoxyacetic acid (4-CPA), heat stress, yielden_US
dc.language.isoEnglishen_US
dc.pages63en_US
dc.publisherPunjab Agricultural University, Ludhianaen_US
dc.research.problemMitigating heat stress through plant growth regulators in tomato (Solanum lycopersicum L.)en_US
dc.subBotanyen_US
dc.themeMitigating heat stress through plant growth regulators in tomato (Solanum lycopersicum L.)en_US
dc.these.typeM.Scen_US
dc.titleMitigating heat stress through plant growth regulators in tomato (Solanum lycopersicum L.)en_US
dc.typeThesisen_US
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