关键词: 水稻, 抽穗扬花期, 高温胁迫, 品质指标, 耐热性

Abstract: Great losses to the rice production are caused by high temperature stress. Using the heat resistant materials screened by International Rice Research Institute, we studied the high temperature stress effect on grain quality of rice in heading and flowering period, the results were as follows: There were big differences of heat tolerance among the heat resistant materials screened by International Rice Research Institute, and there were some materials relatively sensitive to high temperature; high temperature stress greatly affected quality evaluation indexes of rice in heading and flowering period; the changes of rice transparency, length-width ratio, chalky rate, gelatinization temperature, protein content were not related to heat resisting property of rice varieties; under high temperature stress, there was a significant negative correlation between heat resistant coefficient of rice varieties and the change of gel consistency, the correlation coefficient was -0.516 70, and there was a significant positive correlation between the change of amylase content  and heat resistant coefficient of rice varieties, the correlation coefficient was 0.659 78.

Key words: rice, heading and flowering period, high temperature stress, grain quality, heat resisting property