Field evaluation of cotton near-isogenic lines introgressed with QTLs for productivity and drought related traits |
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Authors: | Avishag Levi Andrew H. Paterson Vered Barak Dan Yakir Baohua Wang Peng W. Chee Yehoshua Saranga |
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Affiliation: | (1) The Robert H. Smith Institute of Plant Sciences and Genetics in Agriculture, Faculty of Agricultural, Food and Environmental Quality Sciences, The Hebrew University of Jerusalem, P.O. Box 12, Rehovot, 76100, Israel;(2) Plant Genome Mapping Laboratory, University of Georgia, Athens, GA 30602, USA;(3) Department of Environmental Sciences and Energy Research, Weizmann Institute of Science, P.O. Box 26, Rehovot, 76100, Israel;(4) Cotton Molecular Breeding Lab, NESPAL, University of Georgia, 2356 Rainwater Road, P.O. Box 748, Tifton, GA 31793, USA; |
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Abstract: | Quantitative trait loci (QTLs) for yield and drought related physiological traits, osmotic potential (OP), carbon isotope ratio (δ13C, an indicator of water use efficiency), and leaf chlorophyll content (Chl), were exchanged via marker-assisted selection (MAS) between elite cultivars of the two cotton species Gossypium barbadense cv. F-177 and G. hirsutum cv. Siv’on. The resulting near isogenic lines (NILs) were examined in two field trials, each with two irrigation regimes, in order to (1) evaluate the potential to improve cotton drought resistance by MAS and (2) test the role of physiological traits in plant productivity. NILs introgressed with QTLs for high yield rarely exhibited an advantage in yield relative to the recipient parent, whereas a considerable number of NILs exhibited the expected phenotype in terms of lower OP (5 out of 9), higher δ13C (4 out of 6) or high Chl (2 out of 3). Several NILs exhibited considerable modifications in non-targeted traits including leaf morphology, stomatal conductance and specific leaf weight (SLW). In G. barbadense genotypes, yield was correlated negatively with δ13C and OP and positively with stomatal conductance, SLW and Chl, whereas in G. hirsutum yield was negatively correlated with δ13C, SLW and Chl. This dissimilarity suggests that each of the respective species has evolved different mechanisms underlying plant productivity. We conclude that the improvement of drought related traits in cotton NILs may lead to improved drought resistance via MAS, but that conventional breeding may be necessary to combine the introduced QTL(s) with high yield potential. |
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Keywords: | Carbon isotope ratio Chlorophyll Gossypium spp. Interspecific introgression Marker assisted selection Osmotic potential Specific leaf weight |
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