Impact of high-temperature stress at grain filling stage on rice grain quality in different rice varieties
To investigate the effects of high temperature on the quality of various rice varieties(japonica and indi-ca),three japonica and three indica rice varieties were grown under high temperature(day temperature 35 ℃/night temperature 28 ℃)and control temperature(day temperature 28 ℃/night temperature 22℃)during the filling stage.The results revealed that high temperature led to deterioration in rice appearance and reduced seed weight.However,the effect of high temperature on indica rice was significantly less than that on japonica rice.Additionally,the response to high temperature varied among varieties with different haplotype of Wx gene,which controls amylose content in rice seeds.Wxa-type varieties showed less impact on amylose content under high temperature.In compari-son,the Wxb-type was relatively more affected under high temperature.Although Wxb-type varieties all exhibited var-ying degrees of decline in amylose content,the decline was less prominent in indica rice varieties compared with ja-ponica rice varieties under high temperature.This work will help us understand the differences between japonica and indica varieties and Wx allele types in response to high temperatures during the filling stage,which will contribute to the subsequent selection of varieties tolerant to high temperature.
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