中文摘要：

以14个纤维比强度差异明显的棉花品种为材料,研究了棉纤维素累积特性的基因型差异及与纤维比强度的关系。结果表明,棉株不同果枝部位棉铃的纤维素累积均符合Logistic曲线,棉纤维素累积的5个特征值（纤维素快速累积期的起始、终止时期,最大累积速率及其出现的时期,快速累积持续期）在品种间的变异均较大,与纤维比强度的相关系数存在大小和正负的差异。其中,纤维素最大累积速率和快速累积持续期的变异最大,前者与纤维比强度呈极显著负相关,后者与纤维比强度呈极显著正相关。进一步以纤维素最大累积速率和快速累积持续期为变量,在同样欧氏距离下,基于棉株上、中、下3个果枝部位数据的聚类结果不完全一致,但总体上14个品种可分为纤维素累积快、平缓、中等3种类型,德夏棉1号、科棉1号和美棉33B分别是其中心品种。同时以纤维比强度为变量的聚类分析表明,这3个品种又分别是低强纤维、高强纤维、中等强度纤维3种类型的中心品种。总之,在棉纤维发育过程中,纤维素累积特性存在明显的基因型差异,且高强纤维的形成是以纤维素平缓累积为基础,纤维素累积过快似乎不利于纤维比强度的形成。

英文摘要：

Fiber strength is one of crucial properties of fiber quality in cotton, and cellulose accumulation plays an important role in the formation of fiber strength, but there is little physicochemical data to document the relationship between them. In the present experiment, fourteen cotton cultivars with various fiber strength were selected to study the characters of cellulose accumulation and the relationships among them. The dynamic curves of cotton cellulose accumulation were all in accordance with the Logistic model on bolls from different fruiting branches. Based on the Logistic model, some eigenvalues were gained. Variability and relativity analyses were made on them. The results showed that these were a wide range of variation for Vmax （the maximal speed of cotton cellulose accumulation） and T （the duration of cotton cellulose speed accumulation） and fiber strength had positive correlation with T but negative correlation with Vmax. The cluster analysis results based on cotton fiber cellulose accumulating parameters （ T and Vmax ） and fiber strength by the SPSS software showed that, in the same Euclidean distance, there were differences among bolls on the three fruiting branches. As a whole, the fourteen cultivars could be grouped into three types by two criteria. Based on the cotton cellulose accumulation velocity, they could be clustered into rapid, gentler and medium groups, and based on the fiber strength, they could be clustered into lower, high and medium groups, and DSC-1, KC-1 and AC-33B were their representational cultivars respectively. The results also indicated that, there were differences among genotypes in cellulose accumulation characters and cotton fiber strength, and tight relationship between cotton cellulose accumulation and cotton fiber strength, the gentler speed cellulose accumulation in secondary thickening of fiber cell wall is in favor of forming high fiber strength.