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Identification and validation of an over‐dominant QTL controlling soybean seed weight using populations derived from Glycine max × Glycine soja
Author(s) -
Yan Long,
Li YingHui,
Yang ChunYan,
Ren ShuXin,
Chang RuZhen,
Zhang MengChen,
Qiu LiJuan
Publication year - 2014
Publication title -
plant breeding
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.583
H-Index - 71
eISSN - 1439-0523
pISSN - 0179-9541
DOI - 10.1111/pbr.12197
Subject(s) - quantitative trait locus , biology , heterosis , glycine soja , glycine , locus (genetics) , trait , marker assisted selection , agronomy , genetics , hybrid , gene , amino acid , computer science , programming language
Heterosis, or hybrid vigour, has been used to improve seed yield in several important crops for decades and it has potential applications in soybean. The discovery of over‐dominant quantitative trait loci (QTL) underlying yield‐related traits, such as seed weight, will facilitate hybrid soybean breeding via marker‐assisted selection. In this study, F 2 and F 2 : 3 populations derived from the crosses of ‘Jidou 12’ ( Glycine max ) × ‘ZYD2738’ ( Glycine soja ) and ‘Jidou 9’ ( G. max ) × ‘ZYD2738’ were used to identify over‐dominant QTL associated with seed weight. A total of seven QTL were identified. Among them, qSWT_13_1 , mapped on chromosome 13 and linked with Satt114, showed an over‐dominant effect in two populations for two successive generations. This over‐dominant effect was further examined by six subpopulations derived from ‘Jidou12’ × ‘ZYD2738’. The seed weight for heterozygous individuals was 1.1‐ to 1.6‐fold higher than that of homozygous individuals among the six validation populations examined in different locations and years. Therefore, qSWT_13_1 may be a useful locus to improve the yield of hybrid soybean and to understand the molecular mechanism of heterosis in soybean.