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Screening of Indica Rice (Oryza sativa L.) Genotypes Against Low Temperature Stress

3 Abstract: In this investigation, genotypes having yield level more than 400 g m were selected primarily as low 2 temperature tolerant. There were short and long duration genotypes in those groups. The combination of yield components was quite better in Group I. The genotypes having the highest spikelet number with better yield was found in Group III and IV but they had lower thousand-grain weight. The maximum and minimum temperature around panicle initiation (PI) were 28.7°C and 10.9°C for short duration genotypes and 24.4 and 11.0°C for long duration genotypes. The genotypes encountered low temperature and low solar radiation from vegetative to reproductive phases. A few genotypes maintained better phenotypic acceptability. Most of the selected genotypes experienced spikelet degeneration symptom. The genotypes (Group I, III and IV) producing huge number of spikelets might able to execute panicle differentiation at the initiation of panicle development. But at the subsequent stage there must have some growth impairment activities. In contrast, the genotypes (Group II and V) which having lower number of spikelet m might be affected primarily at the differentiation 2