徐远,刘世杰,杨勇智,李佳蔓,陈炙
XU Yuan,LIU Shijie,YANG Yongzhi,LI Jiaman,CHEN Zhi

• 1:筠连县自然资源和规划局
• 2:四川农业大学林学院生态林业研究所
• 3:长江上游林业生态工程四川省重点实验室
• 4:四川省林业科学研究院

摘要(Abstract)：

研究桤木属种间杂种优势的亲本配合力是选配桤木属种间杂交亲本的主要遗传参数。选用2份桤木、4份台湾桤木和3份欧洲桤木作为亲本,按照不完全随机交配设计(NCⅡ)配置18份(3×6)杂交组合,估算9个种实性状的一般配合力(GCA)、特殊配合力(SCA)等遗传参数和竞争优势。结果显示桤木属种间杂交组合种实性状存在显著的遗传差异,各种实性状均主要表现为基因加性效应遗传,种子长度、宽度和千粒重表现为基因加性效应和非加性效应共同控制。种实性状的狭义遗传力大小顺序为:FWH>FWH>FL>WTS>SL>SW>CL>SSF>SA。亲本间的GCA和杂交组合间的SCA均存在较大的差异,GCA和SCA之间没有相关性。在供试的18份杂交组合材料中,ACjt04、ACjg00和AFhlt01、AGtc02在种实性状上的GCA和SCA值均较高,是优良的亲本材料。18个杂交组合的9个种实性状的竞争优势与GCA和SCA均具有正相关性,与SCA的相关性高于GCA。综合分析,桤木属种间杂交种的竞争优势与GCA和SCA具有紧密的遗传相关,对高GCA亲本和优势SCA杂交组合的选择,是组配强优势桤木属种间杂交育种的关键。
The genetic basis of parental combining ability of hybridization between Alnus plants was studied to provide a theoretical basis for the selection of parents for interspecific hybridization of Alnus plants. Using two A.cremastogyne species, four A. formosana species, and three A. glutinosa species as hybrid parents, 18 hybrid combinations(3 × 6) were configured according to incomplete random mating design(NCⅡ) to calculate the genetic parameters and competitive advantages of 9 seed and fruit traits such as general combining ability(GCA), special combining ability(SCA). The results showed that there were significant genetic differences in seed and fruit traits of Alnus interspecific hybrid combination. All kinds of seed and fruit traits were mainly characterized by gene additive effect inheritance, and seed length, seed width, and 1 000-grain weight were jointly controlled by gene additive effect and non-additive effect. The narrow heritability order of seed and fruit traits was FWH>FWH>FL>WTS>SL>SW>CL>SSF>SA. The GCA value between parents and SCA value between hybrid combinations were quite different,and there was no correlation between GCA and SCA. Among the tested 18 hybrid combinations, ACjt04, ACjg00, and AFhlt01, AGtc02 had higher GCA and SCA values in seed and fruit traits, and could be selected as excellent parents accessions. The competitive advantage of 9 seed and fruit traits of 18 hybrid combinations had positive correlation with GCA and SCA, and the correlation with SCA was higher than GCA. Comprehensive analysis showed that the competitive advantage of Alnus interspecific hybrids had close genetic correlation with GCA and SCA. The selection of high GCA parents and high SCA hybrid combinations was the key to the interspecific hybridization breeding of Alnus with strong dominance.

关键词(KeyWords)： 恺木属;种间杂交;一般配合力;特殊配合力;杂种优势
Alnus Mill.;Interspecific hybridization;General combining ability;Special combining ability;Heritability

Abstract:

Keywords:

基金项目(Foundation): 四川省科技支撑计划项目：突破性性林木育种材料与方法创新(2016NZY0035)

作者(Author): 徐远,刘世杰,杨勇智,李佳蔓,陈炙
XU Yuan,LIU Shijie,YANG Yongzhi,LI Jiaman,CHEN Zhi

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