高温处理对不同状态水稻种子发芽率的影响

以2个早籼稻品种的超干种子、干种子、鲜种子、湿种子、露白种子为材料,研究了高温处理对不同状态水稻种子发芽率的影响。结果表明,水稻不同种子状态耐受高温能力存在极显著差异,从强到弱依次为超干种子干种子鲜种子湿种子露白种子;水温对种子发芽率的影响比气温更显著;处理温度超过一定范围,发芽率随着温度升高和时间延长极显著下降;不同品种高温处理后的种子发芽率表现相同规律趋势,但也存在极显著个体差异;种子水分制约种子耐受高温能力,种子水分含量越高,耐受高温能力越弱。

Effects of High Temperature on Germination Rate of Rice Seed

The effects of high temperature on germination rate of rice seed were studied, using the ultra dry seeds, dry seed, fresh seed, wet seed, white seed of two early indica rice varieties as materials. The results showed that there were significant differences in high temperature tolerance ability of ultra dry seeds, dry seeds, fresh seeds, wet seeds and white seeds, performance for ultra dry seeds>dry seeds>fresh seeds>wet seeds>white seeds. The effects of water temperature on germination rate was more significant than temperature. The germination rate was decreased with the increase of treatment temperature and treatment time significantly in a cer-tain range. The seed germination rate of different rice showed the same trend after temperature treatment, but there were also signifi-cant individual differences. The seed moisture content restricts the ability of high temperature resistence, the higher the moisture con-tent of seeds, the weaker the resistance to heat.