Effect of exogenous plant growth regulators and rhizobial inoculants on physiology traits associated with drought tolerance in blackgram
DOI:
https://doi.org/10.48165/Keywords:
Blackgram, Drought stress, Rhizobial strain and growth hormonesAbstract
Field experiments were conducted at Agricultural College and Research Station, Eachankottai, Thanjavur and Oilseeds Research Station, Tindivanam during Rabi , 2022 &Rabi , 2023 to assess the suitable foliar application of hormones for drought tolerance in blackgram. The experiment was laid out in completely randomized block design and replicated thrice. The treatments are T1-Absolute Control (Without drought), T2-Absolute drought ,T3-Rhizobial strain (MB 1), T4-KCL Spray 1% +T3 T5-100 μmol/L melatonin+T3, T6-200 μmol/L melatonin+T3, T7- 300 μmol/L melatonin+T3, T8-0.1 mM Putrescine +T3, T9-0.2 mM Putrescine+T3, T10-0.3 mM Putrescine+T3. The growth, physiological and yield parameters were recorded and analysed statistically. The results revealed that different foliar spray levels had significant influence on pod yield of blackgram. With regard to growth, physiological and yield parameters T6-200 μmol/L melatonin+T3 performed better compared to other treatments. Drought stress reduced the yield to about 52.26% in absolute stress plants compared to the absolute control (Table 6). The combined effect of soil application of rhizobial strain and foliar application of 200 µM melatonin increased the number of pods (25.65) per plant and grain yield (818.70) per plant under drought stress when compared to control plants.
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