Abstract
For the first time, the authors assessed and mapped the chromosome QTLs (Quantitative Trait Loci) for the manifestation of morpho-physiological and agronomic indices of plant water status and related quantitative traits, such as plant height, weight, and dry matter content in spring bread wheat (Triticum aestivum L.). Following the study of ten agronomic traits, 13 QTLs were mapped on linkage groups 1A, 1B, 2B, 2D, 4A, 5A, 5B, 5D, 6A, and 6D. Some of the identified QTLs concurrently determined several traits. The physiological components of water status were shown to correlate with quantitative traits in wheat plants, such as plant height, weight, and dry matter content, and the correlation coefficients were calculated for all traits under study. Water retention capacity after 3 h correlated with water retention capacity after 24 h (r xy = 0.47). The correlations were also established between water retention capacity after 3 h and plant height at booting stage (r xy = 0.29) and between water retention capacity after 3 h and plant dry weight (r xy = 0.33). Statistical calculations supported generally observed negative correlation (up to −1) between leaf water and dry matter contents, as well as between the root indices of variance in the mapping population of wheat lines. The results obtained in the present study will promote future efforts to fine-map the genes residing within the identified QTLs, to eventually clone these genes in order to establish the physiological mechanisms for maintaining water homeostasis in higher plant cells and to accomplish the practical implementation of marker-assisted assessment of water status in wheat plants studied on the basis of morpho-physiological and economical indices.
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Abbreviations
- LOD:
-
logarithm of odds
- MAS:
-
Marker Assisted Selection
- QTL:
-
quantitative trait locus
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Original Russian Text © Yu.V. Chesnokov, E.A. Goncharova, M.N. Sitnikov, N.V. Kocherina, U. Lohwasser, A. Börner, 2014, published in Fiziologiya Rastenii, 2014, Vol. 61, No. 6, pp. 855–863.
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Chesnokov, Y.V., Goncharova, E.A., Sitnikov, M.N. et al. Mapping QTL for water regime in spring bread wheat. Russ J Plant Physiol 61, 834–841 (2014). https://doi.org/10.1134/S1021443714060041
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DOI: https://doi.org/10.1134/S1021443714060041