Evaluation of Physiological Efficiency in Sorghum (Sorghum bicolor (L.) Moench) Genotypes under Drought Stress

In an experiment conducted during the rabi season at Sorghum Improvement Project, M.P.K.V., Rahuri, Maharashtra during the period of 2016 to 2017. Present study to observed the physiological parameters under non stress and moisture stress condition with cross two genotypes RSV 1237 x RSV 1703. In this study of mean performance of the basic generation P1, P2, F1, F2, B1 and B2 of the cross RSV 1237 x RSV 1703 was observed various physiological parameters viz. photosynthetic rate, rate of transpiration, stomatal conductance, relative leaf water content, SPAD reading, total chlorophyll content and chlorophyll stability index. The significantly highest photosynthesis rate recorded for B2 generation 24.39 µ mole CO2 m-2s-1 under non stress condition and 20.01 µ mole CO2 m-2s-1 moisture stress condition. The highest transpiration rate (2.94 and 1.98 mmole H2O m-2s-1) recorded for parent P1 (RSV 1237) was under non stress and moisture stress condition, respectively. The F2 generation was recorded the lowest transpiration rate (2.51 and 1.77 mmole H2O m-2s-1) under non stress and moisture stress condition, respectively. In the F1 and B2 generation recorded significantly the highest mean of stomatal conductance (0.24 and 0.18 mole m-2 s-1) under non stress condition and moisture stress condition, respectively. The segregating generation B2 recorded significantly the highest SPAD reading (55.43) under non stress condition and B2 generation was recorded highest SPAD reading (44.41) in moisture stress condition. The B2 generation recorded the highest total chlorophyll content (3.31 and 2.07 %) under non stress and moisture stress condition, respectively. Overall experimental study to observed physiological parameters of sorghum cross two genotype (RSV 1237 x RSV 1703)   directly affected in growth and grain yield under non-stress and moisture stress condition.