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Acta Prataculturae Sinica ›› 2018, Vol. 27 ›› Issue (4): 79-88.DOI: 10.11686/cyxb2017213

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Construction of the AFLP linkage map and QTL analysis of powdery mildew resistance in red clover

PU Xiao-jian**, TIAN Jiu-sheng**, TIAN Xin-hui, DU Wen-hua*   

  1. Pratacultural Science College of Gansu Agricultural University, Grassland Ecosystem Key Laboratory of Ministry of Education, Si-no-U. S. Research Centers for Sustainable Grassland and Livestock Management, Lanzhou 730070, China
  • Received:2017-05-02 Revised:2017-07-26 Online:2018-04-20 Published:2018-04-20

Abstract: In this study, F1 generation red clover plants, obtained from crossing red clover varieties resistant (Gannong PR1, and Sensation and Renegade from Australia) or sensitive (Minshan) to powdery mildew, were artificially inoculated with powdery mildew and used as a quantitative trait locus (QTL) mapping population. AFLP markers were used to construct the genetic linkage map and the interval mapping method was used to locate the QTL for resistance to powdery mildew. This study will establish foundation to gene location and transgenosis of red clover. It was found that the linkage map based on 149 AFLP markers included 7 linkage groups (LG1, LG2, LG3, LG4, LG5, LG6 and LG7). The map covers a total distance of 640.5 cM. LG1 was found to be the largest (140.6 cM with the average distance between two markers being 9.4 cM), while LG4 was found to be the smallest yet with the highest marker density of any LG (55.2 cM in length with 1.8 cM on average between markers. Five QTLs (qrp-1, qrp-2, qrp-3, qrp-4 and qrp-5) related to powdery mildew resistance, and located on LG4 and LG5, were detected. The phenotypic variance explained by the 5 QTLs for powdery mildew resistance ranged from 29% to 90%, with the largest contribution being from qrp-1.Therefore, qrp-1 was identified as the main gene controlling powdery mildew resistance in red clover.

Key words: red clover (Trifolium pratense), AFLP marker, genetic linkage map, powdery mildew resistance, QTL analysis