Mitigating heat stress through plant growth regulators in tomato (Solanum lycopersicum L.)
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Date
2021
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Punjab Agricultural University, Ludhiana
Abstract
The 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.
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Citation
Bhatia, Jaya (2021). Mitigating heat stress through plant growth regulators in tomato (Solanum lycopersicum L.) (Unpublished M.Sc. thesis). Punjab Agricultural University, Ludhiana, Punjab, India.