Quantitative trait loci mapping of adult-plant resistance to leaf rust in a Fundulea 900 × ‘Thatcher’ wheat cross
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- 作者：Peipei Zhang ; Aiyong Qi ; Yue Zhou ; Xianchun Xia ; Zhonghu He ; Zaifeng Li and Daqun Liu
- 刊名：Plant Breeding
- 出版年：2017
- 出版时间：February 2017
- 年：2017
- 卷：136
- 期：1
- 页码：1-7
- 全文大小：616K
- ISSN：1439-0523
文摘
Wheat leaf rust (LR), caused by the obligate biotrophic fungus <em>Puccinia triticinaem> (<em>Ptem>), is a destructive foliar disease of common wheat (<em>Triticum aestivumem> L.) worldwide. The most effective, economic means to control the disease is resistant cultivars. The Romanian wheat line Fundulea 900 showed high resistance to LR in the field. To identify the basis of resistance to LR in Fundulea 900, a population of 188 F2:3 lines from the cross Fundulea 900/‘Thatcher’ was phenotyped for LR severity during the 2010–2011, 2011–2012 and 2012–2013 cropping seasons in the field at Baoding, Hebei Province. Bulked segregant analysis and simple sequence repeat markers were used to identify the quantitative trait loci (QTLs) for LR adult-plant resistance in the population. Three QTLs were detected and designated as <em>QLr.hebau-1BLem>,<em> QLr.hebau-2DSem> and <em>QLr.hebau-7DSem>. Based on the chromosome positions and molecular marker tests, <em>QLr.hebau-1BLem> is <em>Lr46em>, and <em>QLr.hebau-7DSem> is <em>Lr34em>. <em>QLr.hebau-2DSem> was derived from ‘Thatcher’ and was close to <em>Lr22em>. This result suggests that <em>Lr22bem> may confer residual resistance on field nurseries when challenged with isolates virulent on <em>Lr22bem>, or another gene linked to <em>Lr22bem> confers this resistance from ‘Thatcher’. This study confirms the value of <em>Lr34em> and <em>Lr46em> in breeding for LR resistance in China; the contribution of the QTL to chromosome 2D needs further validation.