棉纤维发育相关糖类物质转化与纤维产量形成的关系

Relationship between Carbohydrates Transforming and Fiber Dry Weight Formation during Cotton Fiber Development

以生育期相近的2个棉花品种不同季节成铃的棉纤维为材料,研究棉纤维发育相关糖类物质转化、纤维素合成特征与棉纤维干物质质量形成的关系。结果表明:随着开花结铃时间的推迟,棉纤维中可溶性糖和蔗糖的转化率有下降的趋势;可溶性糖和蔗糖转化率高的棉纤维,其纤维素累积最大速率较高,纤维干物质质量快速增长期历时长,有利于纤维干物质质量的增加。对于不同结铃时期的棉铃,棉纤维中蔗糖和纤维素均是通过调节可溶性总糖含量的变化来影响棉纤维干物质质量的增加。因此,棉纤维发育过程中可溶性糖类物质转化情况和纤维素合成特征的差异,是导致不同结铃时期单铃纤维干物质质量形成差异的直接原因。

To investigate the relationship between carbohydrates transforming, characteristics of cellulose synthesis and formation of dry weight during cotton fiber development, the 2-year experiments were carried out in Hefei, Anhui Province （cotton belts in lower basin of the Yangtze River Valley） in 2010-2011 by using cotton fibers in seasonal bolls of two cotton cultivars with simi- lar growth duration as materials. The result showed that： with the delay of anthesis day, soluble sugar and sucrose transformation rates in cotton fiber showed the trend of decrease. The higher transformation rate of soluble sugar and sucrose, the maximal speedily of cellulose accumulation were higher and the period for fiber dry weight fast accumulating was longer, which were helpful for increasing the fiber dry weight. Sugar and cellulose contents in fiber had an influence on the fiber dry weight increase by regulating the change of soluble sugar content. Therefore, the differences of carbohydrate transforming and cellulose synthe- sis characteristics during the fiber development might be an important reason for fiber dry weight formation in cotton boll.