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杉木球果形态变异和SRAP标记的关联分析

Morphological Variation of the Chinese Fir Cones and Its Association with SRAP Markers

  • 摘要: 为揭示杉木不同亲本球果的变异特征及其遗传基础,挖掘与杉木球果形态相关联的分子标记,对广东杉木第3代种子园中50个亲本的球果形态指标进行测定,在分析遗传多样性的基础上,将球果形态数据与SRAP分子标记进行关联分析。结果表明:球果形态特征在亲本间存在极显著差异;各球果表型变异系数达到了11.01%~31.90%,遗传变异系数达到了8.13%~21.54%,所有球果性状的重复力均高于0.8,说明杉木球果形态特征变化受到强烈的遗传因素控制。关联分析共得到59个标记与8个性状显著关联,其中与球果纵径、球果横径、单个球果鲜质量、球果体积、苞鳞层数、苞鳞总数、苞鳞长和苞鳞宽显著关联的标记分别有9、10、6、3、6、9、8和8个。

     

    Abstract: In order to reveal the variation characteristics and genetic basis of cones of different parents of Chinese fir, and explore the molecular markers associated with cone morphology. In this study, morphological characteristics of the Chinese fir cones in Guangdong third-generation seed orchard that harbors 50 parents were investigated. On the basis of analysis of genetic diversity, we made association analysis of the cone morphological data with SRAP markers. The results showed that the morphological characteristics of cones were significantly different among the parents. Phenotypic variation coefficients of each traits ranged from 11.01% to 31.90%, and the genetic variation coefficients spanned from 8.13% to 21.54%. The repeatability of all traits was consistently higher than 0.8, indicating that cone traits were controlled by strong genetic factors. Moreover, there were 59 markers were significantly associated with 8 traits. Among them, the 9, 10, 6, 3, 6, 9, 8 and 8 markers were significantly associated with cone vertical diameter, cone horizontal diameter, single cone fresh weight, cone volume, number of bract scale layers, total number of bract scale, bract scale length, bract scale width, respectively.

     

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