A.K. Mall and Varucha Misra*
ICAR-Indian Institute of Sugarcane Research, Lucknow-226 002, U.P.
Email: Ashutosh.Mall@icar.gov.in
Received-07.11.2018, Revised-27.11.2018
Abstract: Multidimensional effect of drought on rice cultivation in Asia is a recurring climatic event. about 4.62 and 6 million ha area of rice in India in year 2002 and 2009, respectively had been reduced alone due to drought. The development of high yielding drought tolerant rice varieties for diverse nature of drought prone upland ecology is still in its infancy and germplasm still needs to be improved in rainfed eastern India. Considering this, this study has been done to evaluate early maturing genotypes over the season for upland areas of sufficient and deficit moisture regimes. Twenty seven genotypes in advanced yield trial less than 100 days (AYTLT 100 days) were tested for drought tolerance and yield performance. Results showed that Genotype x environment interaction accounted for 32 per cent of the total sum of squares, with environment and genotype responsible for 25 per cent and 43 per cent. There was also significant variation in the delay in flowering among drought stressed genotypes in which flowering time was similar under irrigated condition. Similarly, significant genotypic differences in Drought susceptibility index (DSI) based on grain yield (t ha-1) in each year was also observed. Yield reduction was above 50 per cent except Lalsar in all the environments, while, yield reduction varied from 83.33 per cent in Brown Gora up to 99.28 per cent in RR 366-5 under severe drought stress. In case of desirable stability factor, among the genotypes, only Lalsar followed by CR 143-2-2 showed desirable stability factor for grain yield (t ha-1). Results also revealed that 66 out 78 estimates of correlations assumed significant in all the years and out of 66 estimates of significant correlations, forty two had positive sign and fourteen were negative, mostly estimates were common in nature and led to similar inferences in all the years. Furthermore, the biplot analysis for indices showed that drought resistance parameters and their interaction with drought tolerance parameters were highly significant (P<0.001) and accounted for 94.6 and 3.6 per cent of the treatment combination sum of squares, respectively.
Keywords: Drought, DSI, DTE, G X E interaction, rice, biplot analysis
Abbreviations: AYTLT 100 days- Advanced Yield Trial Less Than 100 days, RYWW – Relative yield under well water, RYSS -Relative yield under stress condition, GMP – Geometric Mean, STI- Stress Tolerance Index, TOL- Stress Tolerance, MP- Mean Productivity, GMP- Geometric Mean Productivity, YRR- Yield Reduction Ratio, TOL- Stress Tolerance, DTI- Drought Tolerance Index; DSI- Drought Susceptibility Index, DTE- Drought Tolerant Efficiency, GY- Grain Yield; DFF- Days To Fifty Per Cent Flowering, HI- Harvest Index
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