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在零上低温条件下,秧苗叶绿素含量和光合强度下降。在低温处理后几天,秧苗体内可溶性糖增多,淀粉含量减少,这是秧苗适应低温的表现,以后则因呼吸消耗,含糖量渐减但烂秧率达一半左右时,秧苗体内似有较多的糖分,所以,湿冷十天八天引起烂秧,不可能是饿死所致。秧苗体内抗坏血酸合量多少,与秧苗抗寒力无关。粳稻秧苗抗寒力大于籼稻,而籼稻在零上低温条件下的呼吸强度则大于粳稻。呼吸猛增是烂秧的生理反应。同一品种,不同生育期的秧苗的抗寒性不同,芽期>不完全叶期>一叶期>二叶期>三叶期>四叶期>五叶,其中以三叶期抗寒性最差,氮肥水平过高,秧苗生长越快含水量高,越不抗寒,
At zero upper and lower temperature, chlorophyll content and photosynthetic capacity of seedlings decreased. A few days after the low temperature treatment, the soluble sugar in the seedling increased, the starch content decreased, which is the seedling to adapt to the performance of low temperature, then due to respiratory consumption, sugar content decreased but rotten seedling rate of about half, the seedling body seems to have more More sugar, therefore, wet and cold ten days caused eight days, can not be caused by starvation. The amount of ascorbic acid in the seedlings, cold hardiness and seedlings nothing to do. The cold resistance of japonica rice seedlings was greater than that of indica rice, while the respiration intensity of indica rice was higher than that of japonica rice at zero upper and lower temperature. Breathing surge is the physiological response of rotten seedlings. The cold-tolerance of seedlings with the same variety and different growth stages was different, with bud stage> incomplete leaf stage> one-leaf stage> two-leaf stage> three-leaf stage> four-leaf stage> five leaves. Poor, too high level of nitrogen fertilizer, seedlings growing faster water content, the more cold-resistant,