NDLI: QTL mapping for leaf senescence-related traits in common wheat under limited and full irrigation

Content Provider	Springer Nature Link
Author	Li, Xing Mao He, Zhong Hu Xiao, Yong Gui Xia, Xian Chun Trethowan, Richard Wang, Hua Jun Chen, Xin Min
Copyright Year	2014
Abstract	Leaf senescence is an important trait for yield improvement under stress. In the present study, 207 F2:4 random inbred lines (RILs) derived from the Jingdong 8/Aikang 58 cross were investigated under limited and full irrigation environments at two locations during the 2011–2012 and 2012–2013 cropping seasons. The RILs were genotyped with 149 SSR markers and QTLs for leaf senescence-related traits and heading dates (HD) were analyzed by inclusive composite interval mapping. The broad sense heritabilities of normalized difference vegetation index at Zadoks47 (NDVIv) and at Zadoks75 (NDVIg), leaf senescence rate (LSR), leaf senescence scored visually (LSS), leaf area index (LAI) and HD were 0.37–0.54, 0.39–0.48, 0.4–0.45, 0.56–0.58, 0.64–0.79 and 0.82–0.86, respectively. There were significant correlations between NDVIg and LSR (r = −0.55 to −0.70), NDVIg and LSS (r = −0.61 to −0.61), and LSS and LSR (r = 0.48–0.68). NDVIv and LAIv explained 18.5 % and 19.4 % of the variation in grain yield under limited irrigation, respectively. Forty five QTLs were distributed on 15 chromosomes. The respective numbers of QTLs for NDVIv, NDVIg, LSR, LSS and HD were 10, 10, 9, 9 and 7 across all eight environments. Previously unreported QTLs were found on chromosomes 1A, 2D, 5B, 7A and 7D for NDVI, on 6D for LSR and 5B for LSS. QNDVIv.caas-4A explained 23.7–56.6 % of the phenotypic variation (PV) for NDVIv and was stably expressed in four environments. In contrast, QNDVIg.caas-4B.2 explained 13.2–16.0 % of PV but was only expressed in full irrigation. Pleiotropic QTLs were detected; QNDVIv.caas-5B, explaining 22.9–35.9 % of PV, had an effect on LSS, and QNDVIg.caas-4D, accounting for 11.5–28.5 % of PV, also influenced NDVIv. QTLs controlling LSR, QLSR.caas-4D and QLSR.caas-3B, also increased thousand kernel weight and grain yield, indicating that rapid senescence increased grain filling rate. Some QTLs such as QNDVIg.caas-1A.1, QLSR.caas-2A, QLSS.caas-2B, QLSS.caas-3B, QLSS.caas-5B and QLSS.caas-2D.1 were detected only under limited irrigation. These drought stress-induced QTLs could be valuable for improving drought resistance in wheat.
Starting Page	569
Ending Page	582
Page Count	14
File Format	PDF
ISSN	00142336
Journal	Euphytica
Volume Number	203
Issue Number	3
e-ISSN	15735060
Language	English
Publisher	Springer Netherlands
Publisher Date	2014-11-02
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Triticumaestivum Quantitative trait locus Leaf senescence Reduced irrigation Plant Sciences Plant Genetics & Genomics Plant Pathology Plant Physiology Biotechnology
Content Type	Text
Resource Type	Article
Subject	Genetics Plant Science Horticulture Agronomy and Crop Science

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