QTL affecting fitness of hybrids between wild and cultivated soybeans in experimental fields. Issue 7 (5th June 2013)

• Record Type: Journal Article
• Authors: Kuroda, Yosuke; Kaga, Akito; Tomooka, Norihiko; Yano, Hiroshi; Takada, Yoshitake; Kato, Shin; Vaughan, Duncan
• Is Part Of: Ecology and evolution. Volume 3:Issue 7(2013:Jul.)
• Page Start: 2150
• Page End: 2168
• Publication Date: 2013-06-05
• Subjects: Ecology -- Periodicals; Evolution -- Periodicals; 577.05
• DOI: 10.1002/ece3.606
• Languages: English
• ISSNs: 2045-7758

Abstract

<abstract abstract-type="main" id="ece3606-abs-0001"> <title>Abstract</title> <p>The objective of this study was to identify quantitative trait loci (QTL) affecting fitness of hybrids between wild soybean (<italic>Glycine soja</italic>) and cultivated soybean (<italic>Glycine max</italic>). Seed dormancy and seed number, both of which are important for fitness, were evaluated by testing artificial hybrids of <italic>G. soja</italic> × <italic>G. max</italic> in a multiple‐site field trial. Generally, the fitness of the F<sub>1</sub> hybrids and hybrid derivatives from self‐pollination was lower than that of <italic>G. soja</italic> due to loss of seed dormancy, whereas the fitness of hybrid derivatives with higher proportions of <italic>G. soja</italic> genetic background was comparable with that of <italic>G. soja</italic>. These differences were genetically dissected into QTL for each population. Three QTLs for seed dormancy and one QTL for total seed number were detected in the F<sub>2</sub> progenies of two diverse cross combinations. At those four QTLs, the <italic>G. max</italic> alleles reduced seed number and severely reduced seed survival during the winter, suggesting that major genes acquired during soybean adaptation to cultivation have a selective disadvantage in natural habitats. In progenies with a higher proportion of <italic>G. soja</italic> genetic background, the genetic effects of the <italic>G. max</italic> alleles were not expressed as phenotypes because the <italic>G. soja</italic> alleles were dominant over the <italic>G. max</italic> alleles. Considering the highly inbreeding nature of these species, most hybrid derivatives would disappear quickly in early self‐pollinating generations in natural habitats because of the low fitness of plants carrying <italic>G. max</italic> alleles.</p> </abstract>