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Independent selection for seed free tryptophan content and vernalization response in chickpea domestication |
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| Authors: | Ruth P van‐Oss Avi Gopher Zohar Kerem Zvi Peleg Simcha Lev‐Yadun Amir Sherman Hong‐Bin Zhang George Vandemark Clare J Coyne Ofer Reany Shahal Abbo |
| Affiliation: | 1. The Robert H. Smith Faculty of Agriculture, Food and Environment, The Levi Eshkol School of Agriculture, The Hebrew University of Jerusalem, Rehovot, Israel;2. The Sonia and Marco Nadler Institute of Archaeology, Tel Aviv University, Ramat Aviv, Israel;3. The Robert H. Smith Faculty of Agriculture, Food and Environment, School of Nutritional Sciences, The Hebrew University of Jerusalem, Rehovot, Israel;4. Deptartment of Biology and Environment, Faculty of Natural Sciences, University of Haifa – Oranim, Tivon, Israel;5. Genomics Department, Volcani Center, Agricultural Research Organization, Bet‐Dagan, Israel;6. Department of Soil and Crop Sciences, Texas A&M University, College Station, Texas;7. USDA‐ARS, Pullman, Washington;8. Department of Natural Sciences, The Open University of Israel, Ra'anana, Israel |
| Abstract: | 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. |
| Keywords: | Cicer arietinum Cicer reticulatum conscious selection crop evolution nutritional quality |
