高温热害对苏香粳3号影响的研究

摘要

通过利用中熟中粳稻苏香粳3号在孕穗至灌浆成熟期分别进行高温热害处理,结果表明:连续高温降低了苏香粳3号的结实率和千粒重,且高温处理时间越长,其结实率和千粒重的下降幅度越大；处理期内日平均最高气温为37℃,孕穗至抽穗期的日最高气温高于40℃的时间达8d,其最低结实率和千粒重分别达72.2％和16.2 g,表现出较强的耐热性.%In this paper, the heat resistance of middle - mature japonica rice Suxiangjing No. 3 was studied through high temperature treatments from booting stage to mature stage. The results showed that the continuous high temperature reduced the setting rate and 1000 - grain weight, and their descend range increased when the time of high - temperature treatment prolonged. The average daily maximum temperature in the treatment period was 37 ℃, there were 8 days when daily maximum temperature was above 40 ℃ from booting stage to heading stage, and the minimum setting rate and 1000 - grain weight were 72. 2% and 16.2 g respectively, so this variety appeared strong heat resistance.