Plant Growth Regulator Mediated Improved Leaf Area Development and Dry Matter Production under Late Sown High Temperature Stress condition in Chickpea

Author: Supriya Debnath, R. Shiv Ramakrishnan, Rohit Kumar Kumawat, Krishnapriya Vengavasi, Ashish Kumar, Radheshyam Sharma, Anubha Upadhyay, Anita Babbar and R.K. Samaiya

Download PDF

Abstract

Agriculture is a climate-driven process highly affected by an increase in the global mean surface temperature due to global warming. Temperature beyond the optimum level leads to heat stress and causes irreversible damage to the growth and development of chickpea. Plant growth regulator application is a viable option to induce heat tolerance and achieve a stable yield. Therefore, an experiment was conducted to identify effective plant growth regulators for improving dry matter production and leaf area development in chickpea under high-temperature stress conditions. The investigation comprises two chickpea genotypes viz., JG14 (heat tolerant cultivar) and JG 36 with two different dates of sowing viz., normal sown and late sown over two years for exposing the crop to high temperature and nine sub-sub treatments viz., control (no spray), water spray, foliar spray of plant growth regulators viz., thiourea (100ppm, 200 ppm, 400 ppm and 600 ppm) and salicylic acid (200 ppm, 400 ppm and 600 ppm) at anthesis stage. Due to high-delayed sown temperature stress conditions, reduction in leaf area, dry matter production of primary branches, secondary branches, pods, and total dry matter production was recorded. Heat tolerant genotype JG14 exhibited enhanced dry matter production and leaf area development at all stages over genotype JG36. Foliar application of salicylic acid @200 ppm induces heat stress tolerance in chickpea by augmenting leaf area development, dry matter production of leaf, primary & secondary branches, pods, and total dry matter production as compared to other treatments under delayed sown conditions. Under normal sown condition, foliar application of thiourea @ 600 ppm effectively enhanced leaf area, dry matter of leaf, primary and secondary branches. Salicylic acid @ 400 ppm enhanced pod dry matter and total dry matter production under normal sown condition.

Keywords

Dry matter production, leaf area, plant growth regulators, late sowing, heat stress, heat tolerance, salicylic acid, thiourea

Conclusion

Delayed sown high-temperature stress causes a devastating effect on dry matter production of leaf, primary branches, secondary branches, and leaf area development. Heat tolerant genotypes JG 14 exhibited maximum increase in dry matter of leaf, primary and secondary branches. In contrast, JG 36 exhibited enhanced pod dry matter and total dry matter. JG 14 reveals a maximum increase in leaf area at all stages of growth over normal and late-sown conditions. Under the normal sown condition, over the varieties and averaging over different stages of growth, thiourea @ 600 ppm was found to be effective in enhancing leaf area (630.00 cm2) (Fig. 5), leaf dry weight (1.865g), and primary branches dry weight (0.658 g) (Fig. 4). Salicylic acid @ 200 ppm expressed maximum dry matter production of secondary branches (2.39g). In comparison, salicylic acid @ 400 ppm was found to be effective in enhancing pod dry matter (10.42g) and total dry matter (14.85g) (Fig. 4). Under delayed sown high-temperature stress condition, salicylic acid @ 200 ppm proves its stress mitigating potential by exhibiting superiority in enhancing leaf area (514.07 cm2) (Fig. 5), dry weight of leaf (1.644 gm), dry weight of primary branches (0.566 g) and secondary branches (2.01 g), dry matter of pods (10.98 g) and total dry matter production (16.45 g) (Fig. 3).

References

-

How to cite this article

Supriya Debnath, R. Shiv Ramakrishnan, Rohit Kumar Kumawat, Krishnapriya Vengavasi, Ashish Kumar, Radhesham Sharma, Anubha Upadhyay, Anita Babbar and R.K. Samaiya (2022). Plant Growth Regulators Mediated Improved Leaf Area Development and Dry Matter Production under Late Sown High Temperature Stress condition in Chickpea. Biological Forum – An International Journal, 14(4): 331-342.