Variability and relationship between agronomic traits and grain yield in rice (Oryza sativa L.) under heat stress conditions
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Abstract
A high temperature at the flowering stage of rice, which is the most critical time, causes spikelet fertility to decrease among different rice varieties. Variability and relationship between agronomic characteristics and grain yield in 15 rice varieties were investigated under high-temperature conditions from 40ºC to 45ºC for 6 hours during the daytime at their reproductive stage. The results showed that high temperature significantly declined seed set and yield per plant of all varieties. Based on the seed set at high temperature, M9962 was the most tolerant, while Sinlek, Khao Dawk Mali 105, Chainat 1, and RD49 were susceptible. The genotypic coefficient of variation (GCV) and phenotypic coefficient of variation (PCV) had analyzed. All traits had lower GCV than that of PCV. The spikelets number per panicle, seed set, and 1,000-grain weight had higher heritability than other traits under high temperatures. Phenotypic correlation coefficients at high temperatures among all traits were estimated. The greatest directly positive affected on yield per plant was seed set following by panicle weight under high temperatures. It indicated that seed set and panicle weight could be applied for selecting high yielding genotypes under high-temperature conditions
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References
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