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通过设置播期试验,使位于棉株不同果枝果节部位棉铃的纤维加厚发育期(铃龄25~50 d)处于不同温度条件下,研究温度与棉株生理年龄对棉纤维加厚发育及纤维比强度的影响。结果表明,温度与棉株生理年龄的影响存在互作效应,铃龄25~50 d日均温26℃左右时,棉株中部(7~9果枝)铃纤维蔗糖合成酶活性最高,-β1,3-葡聚糖酶活性最低,纤维素的累积量和累积速率最高,纤维超分子结构取向参数最小,纤维比强度最大;铃龄25~50 d日均温低于20℃时,温度是影响棉纤维加厚发育及纤维比强度的首要因子,当铃龄25~50 d日均温低于16.0℃时,蔗糖合成酶、-β1,3-葡聚糖酶活性很快稳定到一个极值水平,纤维素累积量和累积速率极低,纤维超分子结构取向参数显著变大,纤维比强度显著下降,棉株生理年龄对纤维比强度的影响很小。
By setting sowing date experiment, the boll growth stage (25-50 days of age) of cotton bolls located at different fruiting branches of cotton plants was under different temperature conditions. The influences of temperature and physiological age of cotton plants on cotton fiber thickening development and Fiber strength than the impact. The results showed that there was an interaction effect between temperature and physiological age of cotton plants. The highest sucrose synthase activity in bolls of middle part of cotton plants (7-9) 3-glucanase activity was the lowest, the accumulation and accumulation rate of cellulose was the highest, the orientation parameter of fiber supramolecular structure was the smallest, and the fiber strength was the highest. When the average daily temperature was lower than 20 ℃, Cotton fiber thickened development and fiber strength of the first factor, when the bell day age of 25 ~ 50 d lower than 16.0 ℃, sucrose synthase, β1,3-glucanase activity quickly stabilized to an extreme value Level, the cumulative amount and accumulation rate of cellulose were extremely low, the orientation parameters of the fiber supramolecular structure were significantly increased, and the fiber specific strength was significantly decreased. The physiological age of cotton plants had little effect on the fiber specific strength.