Independent selection for seed free tryptophan content and vernalization response in chickpea domestication
2018
van‐Oss, Ruth P. | Gopher, Avi | Kerem, Zohar | Peleg, Zvi | Lev‐Yadun, Simcha | Sherman, Amir | Zhang, Hong‐Bin | Vandemark, George | Coyne, Clare J. | Reany, Ofer | Abbo, Shahal
Chickpea shows a distinct domestication trajectory vis‐a‐vis pod dehiscence and growth cycle mediated by vernalization insensitivity compared with its companion Near Eastern legumes. Our objectives were: (i) to map the quantitative trait loci (QTLs) associated with vernalization response and seed free tryptophan in domesticated × wild chickpea progeny and (ii) estimate the genetic correlation between vernalization response and free tryptophan content. A domesticated × wild chickpea cross was used to document phenotypic segregation in both traits and to construct a skeletal genetic map for QTL detection. A number of vernalization response and seed free tryptophan content QTLs were documented in both F₂ and F₃ generations. No significant genetic correlation between these two traits was observed. Epistatic relationship between two free tryptophan loci was documented. It is evident that selection for high seed tryptophan is easier to accomplish relative to selection for vernalization insensitivity. This suggests that the two traits were selected independently in antiquity, thereby corroborating earlier claims for conscious selection processes associated with chickpea domestication.
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