Investigation on High Temperature and Heat Damage of Indica Hybrid Rice in Two Seasons and Its Effects on Regenerative Season
With 18 Indica hybrid rice varieties as research materials,ear shape was divided into middle big ear and middle small ear.Seed set-ting rate was investigated and the effects of moderate high temperature from booting to heading on regenerative season were researched under natural condition.Results showed that there were differences in heat resistance among varieties.Among the 14 varieties,seed-setting rates of middle big ear and middle small ear of Shenyouyuehesimiao and Yongyou 4901 were above 85％,showing strong heat resistance.Seed-setting rates of middle big ear and middle small ear of Y Liangyou 911 was above 80％,showing relatively strong heat resistance.Seed-setting rates of middle big ear and middle small ear of other varieties were below 80％,and the seed-setting rates between middle big ear and middle small ear were above 10 percentage points,showing general or weak heat resistance.With the occurrence of high temperature,filling stage of first season shortened,yield reduced and heading period of regenerative season happened in advance. Finally, measures to reduce high temperature heat damage of regenerative season in Tongcheng City were put forward.
Two harvesting of one sowingIndica hybrid riceHigh temperature damageSeed-setting rateFirst seasonRegenerative season
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