水稻冷抗的动态模型分析

 在自然和人工气候室条件下对具有没 抗冷性的水稻品种在不同生育时期进行连续的低水温和低气温处理，采用阴抗＝应力／应变（R＝ F／S），研究了低温下水稻不同形态指标Ｒ的动态特征，进一步分析了R－t，S－t和F－s的特性，F是低温积累量在体内产生的应力，处理初期诱发R增加，S为植物体在低温下的变化量。R随处理时间呈抛物线型变化，其值可用来比较不同品种的抗冷能力，据R的F－S特性将冷抗R分为静抗、动抗和静动兼有的3个类型。

Dynamic Model of Rice Cold Resistance

Under the condition of field or growing chamber,different cold-resistance rice cultivars were continuously treated with low water temperature or low air temperature in various developmental period. According to cold resistance = cold stress / cold strain (R=F/S), dynamic characteristics of different morphological indices R in rice were studied under low temperature, and relationship of S-t. R-t and F-S were further analyzed. F was cold stress in vivo produced by the accumulating amount of treating low temperature and induce R increase during the early treatments.S was the variate of plant indices induced by low temperature. The R value appeared parabolic change with response to treated time,and the treated time of maximum R might be used to evaluate the cold resistant ability of rice cultivars. Based on F-S characteristics. it suggested that cold resistance has three types, i.e. static resistance, dynamic resistance and that with both of them.