The genetics of domestication of yardlong bean, Vigna unguiculata (L.) Walp. ssp. unguiculata cv.-gr. sesquipedalis

Abstract

This is the first report of QTLs for domestication-related traits in yardlong bean. The results provide a foundation for marker-assisted selection of domestication-related QTLs in yardlong bean and enhance understanding of domestication in the genus Vigna.

Pod Shattering: A Homologous Series of Variation Underlying Domestication and an Avenue for Crop Improvement

“…The different results likely stem from different crosses being used in these two studies. Similar to the findings of the more recent study [105], four QTLs concentrated in two regions were shown to regulate pod fiber layer thickness, which control pod shattering in cowpea by two genes [49,104]. Pod dehiscence in cowpea may be regulated by a different set of genes.…”

“…Genetic analysis of pod shattering has been carried out in various legumes including soybean [48,[93][94][95][96][97][98][99][100][101], common bean [13,44], pea [18,50,102], cowpea [49,[103][104][105][106], lentil [16,46,107], narrow-leaf lupin [47,108], azuki bean [45,109], and common vetch [43,110]. In most of the legumes that have been studied so far, pod shattering is found to be a dominant trait controlled by one or two genes or QTLs (Table 1).…”

“…Several studies demonstrated shattering resistance can be gained by mutations in a single locus (common vetch [43]; common bean [44]; azuki bean [45]; lentil [46]), or in two loci (narrow-leaf lupin [47]; soybean [48]; cowpea [49]; pea [50]). Throughout the domestication process, strong selection of these loci leads to the fixation of non-shattering trait in crop plants [33], and consequently, a number of modern cultivars have indehiscent pods.…”

Legume Crops Phylogeny and Genetic Diversity for Science and Breeding

“…In domesticated species, this is removed or delayed. Breeding experiments have shown singlelocus control of pod dehiscence in lentil (Erskine, 1985), two in mungbean (Isemura et al, 2012), yardlong bean (Kongjaimun et al, 2012) and pea (Weeden, 2007). One locus controls the number of twists along the length of the shattered pod, while the second locus controls the percentage of shattered pods (Weeden and Wolko, 2001;Ambrose and Ellis, 2008).…”

QTLs CONTROLLING SEED WEIGHT AND DAYS TO FLOWERING IN MUNGBEAN [Vigna radiata (L.) Wilczek], THEIR CONSERVATION IN AZUKI BEAN [V. angularis (Ohwi) Ohwi & Ohashi] AND RICE BEAN [V. umbellata (Thunb.) Ohwi & Ohashi]

“…High genome conservation among species in the genus Vigna has been demonstrated (Fatokun et al, 1992;Somta et al, 2006;Isemura et al, 2007Isemura et al, , 2010Kongjaimun et al, 2012). Mungbean, azuki bean and rice bean belong to the subgenus Ceratotropis which are known as Asian Vigna because they are all originated in Asia.…”