中文摘要：

以美棉33B为材料,2007年和2009年在江苏南京池栽条件下设置渍水试验,研究花铃期渍水对棉纤维糖代谢的影响及其与纤维比强度的关系。结果表明,渍水条件下花后17-38 d纤维蔗糖和β-1,3-葡聚糖含量均值分别降低24.86%-81.30%和8.59%-36.30%,纤维素最大累积速率在受渍害较轻条件下增加而受渍害较重条件下降低,但快速持续期缩短,成熟期纤维素含量降低,比强度下降3.57%-10.03%。受渍害较轻条件下,花后17-38 d纤维蔗糖合酶（SS）和蔗糖磷酸合酶（SPS）活性均值分别增加8.45%-24.59%和12.79%-18.20%,生成碳源用于维持生存代谢,而受渍害较重条件下分别降低7.06%-8.16%和11.40%-11.64%;蔗糖酶和β-1,3-葡聚糖酶活性在花后17 d后降低。因此,渍水条件下纤维加厚发育期碳源供应不足、碳代谢消耗增加或代谢被抑制是最终比强度下降的重要原因。

英文摘要：

The experiments were conducted using a cotton cultivar NuCOTN 33B with pool culture under different waterlogging treatments in 2007 and 2009 to study effects of waterlogging on carbohydrate metabolism and its relationship with fiber strength during flowering and bolling stage in Nanjing, China. The results showed that the mean values of sucrose andβ-1,3-glucan con-tents decreased by 24.86%to 81.30%and 8.59%to 36.30%respectively at 17 to 38 days after anthesis under waterlogging. The maximum rate of cellulose accumulation increased in response to mild waterlogging conditions, decreased in response to serious conditions, but the duration of maximum cellulose accumulation shortened, which resulted in the decrease in cellulose content. The value of fiber strength at mature period decreased by 3.57%to 10.03%under waterlogging. The mean values of SS and SPS activities increased by 8.45% to 24.59% and 12.79% to 18.20% respectively in response to mild waterlogging conditions, but decreased by 7.06%to 8.16%and 11.40%to 11.64%respectively at 17 to 38 days after anthesis in response to the serious water-logging conditions, which were due to enhanced metabolic demands. Waterlogging decreased the activities of sucrase andβ-1,3-glucanase after 17 days after anthesis. Therefore, insufficient carbon source, together with the increased carbon consumption or the inhibited sugar metabolism were potential factors contributing to low fiber strength for waterlogging plants.