Genetic analysis of tomato internode length via mixed major gene plus polygene inheritance model
Genetic analysis of tomato internode length via mixed major gene plus polygene inheritance model
复制标题
主基因+多基因混合遗传模型对番茄节间长度的遗传分析
DOI：
10.1016/j.scienta.2018.11.044
复制
发表时间：
2019-02-27
影响因子：
4.3
通讯作者：
Li, Jun-Ming
中科院分区：
文献类型：
--
作者：
Sun, Xiao-Rong;Liu, Lei;Li, Jun-Ming
节间长度是影响番茄栽培和育种的重要因素。采用多代主基因+多基因联合分析方法，研究了番茄节间长度的遗传规律。以Heinz 1706（中节间）× P502（长节间）和P1609（短节间）× P502为亲本，分别获得6个群体（P-5、P-2、F-1、B-1、B-2和F-2）。苗期30天的数据表明，两个组合的节间长均符合D-2模型，其次为1对加性主基因加性-显性多基因遗传模型。F-2群体的主效基因遗传力最高（75.92%和70.16%）。而40天苗的节间长符合E-1模型，即2对加性-显性-上位性主基因加性-显性多基因遗传模型。B-1、B-2和F-2群体的主基因遗传力在34.33%~ 78.16%之间，多基因遗传力在1.92%~ 24.50%之间。说明番茄节间长度主要受主基因控制，应在早期群体中进行选择。本研究结果为番茄植株构型改造提供了重要信息，并为进一步的QTL定位奠定了基础。
Internode length is an important factor influencing tomato cultivation and breeding. To investigate the genetic inheritance of tomato internode length, a multi-generation joint analysis of major genes plus polygene model was employed in this study. Six populations (P-5, P-2, F-1, B-1, B-2 and F-2) were obtained from the Heinz1706 (medium internode) x P502 (long internode) and P1609 (short internode) x P502 crosses, respectively. The data of the 30th day seedlings showed that the internode length of two crosses fitted the D-2 model, followed by the one additive major gene plus additive-dominance polygene genetic model. The highest heritability of the major gene was observed in the F-2 population (75.92% and 70.16%). However, the internode length of the 40th day seedlings fitted the E-1 model, namely two additive-dominance-epistasis major genes plus additive-dominance polygene genetic model. The heritabilities of the major genes ranged from 34.33% to 78.16% in B-1, B-2 and F-2 populations, while the heritabilities of the polygene were between 1.92% and 24.50%. These results suggested that the tomato internode length was mainly controlled by major gene and should be selected in early populations. Therefore, our findings may provide important information for plant architecture modification of tomato and may lay the foundation for further QTL mapping.