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提要 在３０％ＰＥＧ－６０００室内模拟干旱条件下，对抗旱性不同的４个小麦品种萌发期的胚芽鞘长度进行了测定，用Ｌｏｇｉｓｔｉｃ方程对芽鞘生长进行了模拟。对曲线参数的分析表明，水分胁迫下芽鞘生长的最快速度下降，生长最快的时间提前，最终导致芽鞘长度缩短。抗旱性强的品种生长速度下降小于抗旱性弱的品种，因而前者芽鞘最终长度长于后者。渗透调节能力强是抗旱性强的品种芽鞘较长的重要原因。
Abstract The coleoptile length of 4 wheat cultivars with different drought resistance during germination was determined under 30% PEG-6000 simulated indoor drought conditions. Log growth equation was used to simulate the growth of coleoptile. The analysis of the curve parameters showed that the fastest growth rate of the coleoptile grew under the water stress and the fastest growth time led to the shortened length of the coleoptile. The drought-resistant varieties decreased less rapidly than those with weak drought resistance, and the final length of the former was longer than the latter. Strong ability of osmotic adjustment is an important reason for the longer germination sheath of drought tolerant varieties.