茶树炭疽病抗性的QTL分析

doi:10.13305/j.cnki.jts.2016.04.012

摘要/Abstract

摘要： 以茶树SSR遗传连锁图谱为基础,选取龙井43为母本,白毫早为父本的170株F1遗传群体为试验材料,于2014年对该群体分别进行了茶树炭疽病抗性性状的田间观测和室内侵染试验,并采用复合区间作图法对该性状进行QTL定位与分析。结果显示：从F1群体病叶上分离纯化出一种茶树炭疽病病菌HZ-1,经 NCBI BLAST比对,其ITS基因序列与炭疽菌（Colletotrichum sp.）的亲缘关系最近,序列相似度为99%。对F1群体的炭疽病抗性表型分析发现,田间环境下的感病单株的占比（41%）高于室内环境（24%）。QTL分析显示,在6个不同的遗传连锁群（Linkage group,LG）上共检测到8个QTLs,单个QTL的LOD阈值变幅为2.53~6.80,单个QTL的表型变异贡献率的变幅为5.6%~13.8%。LG10存在1个控制茶树炭疽病抗性性状的主效QTL,LOD值6.80,表型变异贡献率13.8%。

关键词: 炭疽病抗性, QTL定位, 茶树, SSR遗传图谱

Abstract: In order to provide a basis for breeding tea plants with anthracnose resistance, 170 F1 plants, derived from LJ43♀×BHZ♂, were used to constructed a linkage map by SSR markers. Field observation and indoor test were carried out in 2014. The data of phenotypic characters were used for QTL mapping and analysis by the method of MQM mapping. A pathogen was isolated from a diseased leaf of the F1 plants, and its gene sequence of ITS had 99% similarity with Colletotrichum sp. based on NCBI BLAST. The plants grown in open field were more easy to be infected by the pathogen than those grown in rooms. Eight QTLs were detected in six different linkage groups by QTL analysis. The LOD and PVE of individual QTLs ranged from 2.53 to 6.80 and 5.6% to 13.8%, respectively. A main QTL with LOD 6.80 and PVE 13.8% was detected in LG10.

Key words: anthracnose resistance, QTL mapping, tea plant, SSR linkage map

中图分类号:

徐礼羿, 谭礼强, 王丽鸳, 齐桂年, 成浩, 韦康. 茶树炭疽病抗性的QTL分析[J]. 茶叶科学, 2016, 36(4): 432-439. doi: 10.13305/j.cnki.jts.2016.04.012.

XU Liyi, TAN Liqiang, WANG Liyuan, QI Guinian, CHENG Hao, WEI Kang. QTL Analysis for Anthracnose Resistance in Tea Plant (Camellia sinensis)[J]. Journal of Tea Science, 2016, 36(4): 432-439. doi: 10.13305/j.cnki.jts.2016.04.012.

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