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AOBPreview published online on August 29, 2007
Annals of Botany, doi:10.1093/aob/mcm155
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© 2007 The Author(s)
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/2.0/uk/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Genome Dissection of Traits Related to Domestication in Azuki Bean (Vigna angularis) and Comparison with other Warm-season Legumes

Takehisa Isemura1,{dagger}, Akito Kaga1,{dagger}, Saeko Konishi2, Tsuyu Ando2, Norihiko Tomooka1, Ouk Kyu Han3 and Duncan A. Vaughan1,*

1 National Institute of Agrobiological Sciences, Kannondai 2-1-2, Tsukuba 305-8602, Ibaraki, Japan
2 Society for Techno-innovation of Agriculture, Forestry and Fisheries 446-1 Ippaizuka, Kamiyokoba, Tsukuba, Ibaraki, 305-0854, Japan
3 Winter Cereal and Upland Crop Division, Honam Agricultural Research Institute, NICS, Rural Development Administration, #381 Songhak-dong, Iksan 570-080, Seoul, Korea

* For correspondence. E-mail duncan{at}affrc.go.jp

Received: 29 September 2006    Returned for revision: 28 November 2006    Accepted: 23 May 2007   

Background: The objective of this study was to dissect into quantitative trait loci (QTLs) the large morphological and physiological differences between cultivated azuki bean (Vigna angularis) and a wild relative and to infer the commonalities of the QTLs for domestication-related traits across the Asian Vigna and with other warm-season legumes.

Methods: Two linkage maps, for the BC1F1 and F2 populations, respectively, from the same cross between azuki bean and V. nepalensis were developed. Using these linkage maps QTLs for 33 domestication-related traits were analysed and mapped. The location of mapped QTLs was compared with locations of similar QTLs in other warm-season legumes.

Key Results: QTLs were detected for seed-, pod-, stem- and leaf-related traits. Most traits were controlled by between two and nine QTLs but several traits, such as pod dehiscence, were controlled by single genes. QTLs for domestication-related traits were restricted to particular regions of the azuki bean genome, especially linkage groups 1, 2, 4, 7 and 9. Linkage groups 1 and 2 had QTLs for a suite of traits including pod size, germination, seed size and lower stem length. QTLs on linkage groups 7 and 9 were associated with upper stem length, maximum leaf size and pod and seed size. Pleiotropy or close linkage of genes for domestication-related traits is suggested in these regions. While some QTLs are common to azuki bean and other warm-season legumes, many are recorded for the first time in azuki bean.

Conclusions: QTLs for a large number of domestication-related traits have been mapped for the first time in azuki bean. QTLs with unexpected effect and new QTLs for traits such as seed size have been found. The results provide a foundation that will be useful for improvement of azuki bean and related legumes.

Key words: Azuki bean, Vigna angularis var. angularis, Vigna nepalensis, wild species, QTL, microsatellite

{dagger} These authors contributed equally to this paper.


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