中文摘要：

以高、中、低纤维比强度棉花品种‘科棉1号’、‘美棉33B’、‘苏棉15号’和‘德夏棉1号’为材料,研究与棉纤维加厚发育密切相关的可溶性糖、蔗糖和β-1,3-葡聚糖含量动态变化特性及其对纤维比强度形成的影响.结果显示,与中、低强纤维品种相比,高强纤维品种棉花铃龄为10 d时纤维可溶性糖、蔗糖含量高,全铃期内其转化率高且转化彻底,铃龄为24～31 d期间蔗糖累积量高;纤维加厚发育起始期的β-1,3-葡聚糖含量峰值高,其中后期转化迅速而彻底.高强纤维品种棉纤维中可溶性糖、蔗糖和β-1,3-葡聚糖含量动态变化特性利于纤维素累积特性的优化,即快速累积期长、累积速率平缓,易形成高强纤维.研究表明,在物质变化水平上,可溶性糖、蔗糖和β-1,3-葡聚糖含量动态变化特性影响到棉纤维素累积特性,是导致棉纤维比强度品种差异的重要原因.

英文摘要：

Cotton cultivars differing in fiber strength （KM-1 with high strength fiber,MM-33B with middle strength fiber,SM-15 and DXM-1 with low strength fiber） were chosen to research the genotypic differences in dynamic changes of the matters related with cotton fiber thickening development and fiber strength formation. The cotton fiber of the high strength fiber genotype had higher soluble sugar and sucrose contents than that of the middle and low strength fiber genotypes at 10th day of boll age and lower ones before boll opening. The results indicated that the high strength fiber genotype had higher soluble sugar and sucrose transformed rates during whole boll age and higher sucrose content increment during the period from 24th day to 31th day of boll age. At the same time, it had a remarkable higher peak value in β-1,3-glucan content at the very beginning of secondary wall thickening followed by a sharp drop to a very low level. The dynamic change characteristics of soluble sugar, sucrose and β-1,3-glucan content in cotton fibers of the high strength fiber genotype optimized cellulose accumulation process：a longer period taking for cellulose speedy accumulation and a tempered rate in cellulose deposition. It was beneficial to high strength fiber formation. Therefore, genotypic differences in dynamic changes of soluble sugar, sucrose and β-1,3-glucan contents caused the differences in cellulose accumulation characteristics and led to the genotypic variation in cotton fiber strength eventually.