Genetic Architecture of Nitrogen-Deficiency Tolerance in Wheat Seedlings Based on a Nested Association Mapping (NAM) Population

Genetic divergence for nitrogen utilization in germplasms is important in wheat breeding programs, especially for low nitrogen input management. In this study, a nested association mapping (NAM) population, derived from "Yanzhan 1" (a Chinese domesticated cultivar) crossed with "Hussa...

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Published in:	Frontiers in plant science Vol. 9; p. 845
Main Authors:	Ren, Deqiang, Fang, Xiaojian, Jiang, Peng, Zhang, Guangxu, Hu, Junmei, Wang, Xiaoqian, Meng, Qing, Cui, Weian, Lan, Shengjie, Ma, Xin, Wang, Hongwei, Kong, Lingrang
Format:	Journal Article
Language:	English
Published:	Switzerland Frontiers Media S.A 26-06-2018
Subjects:	nested association mapping (NAM) nitrogen utilization Plant Science quantitative trait loci (QTLs) semi-wild wheat wheat breeding nitrogen utilization wheat breeding nested association mapping (NAM) quantitative trait loci (QTLs) semi-wild wheat
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Summary:	Genetic divergence for nitrogen utilization in germplasms is important in wheat breeding programs, especially for low nitrogen input management. In this study, a nested association mapping (NAM) population, derived from "Yanzhan 1" (a Chinese domesticated cultivar) crossed with "Hussar" (a British domesticated cultivar) and another three semi-wild wheat varieties, namely, "Cayazheda 29" ( ssp. Shao), "Yunnan" ( ssp. King), and "Yutian" ( Udats et Migusch), was used to detect quantitative trait loci (QTLs) for nitrogen utilization at the seedling stage. An integrated genetic map was constructed using 2,059 single nucleotide polymorphism (SNP) markers from a 90 K SNP chip, with a total coverage of 2,355.75 cM and an average marker spacing of 1.13 cM. A total of 67 QTLs for RDW (root dry weight), SDW (shoot dry weight), TDW (total dry weight), and RSDW (root to shoot ratio) were identified under normal nitrogen conditions (N ) and nitrogen deficient conditions (N ). Twenty-three of these QTLs were only detected under N conditions. Moreover, 23 favorable QTLs were identified in the domesticated cultivar Yanzhan 1, 15 of which were detected under N conditions, while only four were detected under N conditions. In contrast, the semi-wild cultivars contributed more favorable N -specific QTLs (eight from Cayazheda 29; nine from Yunnan), which could be further explored for breeding cultivars adapted to nitrogen-deficient conditions. In particular, from YN should be further evaluated using high-resolution mapping.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 This article was submitted to Evolutionary and Population Genetics, a section of the journal Frontiers in Plant Science Edited by: Yiwei Jiang, Purdue University, United States Reviewed by: Shuanghe Cao, Institute of Crop Sciences (CAAS), China; Xingwang Yu, North Carolina State University, United States These authors have contributed equally to this work.
ISSN:	1664-462X 1664-462X
DOI:	10.3389/fpls.2018.00845