用6个晚籼稻品种或品系,于开花期在人工气候室内用冷温18/15℃(昼温/夜温)处理1、3、5天,测定了相对结实受害率、开花率、开药率和干胚膜脂肪酸不饱和指数(IUFA)。相对结实受害率低者,其耐冷性则强。晚籼稻不同品种(品系)冷温下的开药率与相对结实受害率成负相关,r=-0.558。这两个指标,应用于水稻品种生态适应性和耐冷性育种研究较有实用价值。 Six late indica rice cultivars or lines were treated in the artificial climate chamber at the blooming temperature of 18/15 ℃ (day temperature / night temperature) for 1,3,5 days at the flowering stage. The relative solidification damage rate, flowering rate, And dry embryo membrane fatty acid unsaturation index (IUFA). Relatively low incidence of solid damage, its cold tolerance is strong. There was a negative correlation between the open-pollination rates of different varieties (lines) at cold temperature and relative solid-borne damage rates, r = -0.558. These two indicators, applied to rice varieties of ecological adaptability and cold tolerance breeding more practical value.