Identification of Two Major Rice Sheath Blight Resistance QTLs, qSB1-1HJX74 and qSB11HJX74, in Field Trials Using Chromosome Segment Substitution Lines

被引：27

作者：

Zhu, Yajun ^{[1
]}

Zuo, Shimin ^{[1
]}

Chen, Zongxiang ^{[1
]}

Chen, Xingguang ^{[1
]}

Li, Gang ^{[1
]}

Zhang, Yafang ^{[1
]}

Zhang, Guiquan ^{[2
]}

Pan, Xuebiao ^{[1
]}

机构：

[1] Yangzhou Univ, Key Lab Crop Genet & Physiol Jiangsu Prov, Key Lab Plant Funct Genom, Minist Educ,Coll Agr, Yangzhou 225009, Peoples R China

[2] South China Agr Univ, State Key Lab Conservat & Utilizat Subtrop Agrobi, Guangzhou, Guangdong, Peoples R China

来源：

PLANT DISEASE | 2014年 / 98卷 / 08期

关键词：

QUANTITATIVE TRAIT LOCI; JAPONICA RICE; DISEASE RESISTANCE; POPULATION; QUALITY; SHAPE;

D O I：

10.1094/PDIS-10-13-1095-RE

中图分类号：

Q94 [植物学];

学科分类号：

071001 ;

摘要：

Sheath blight (SB) is among the most destructive rice (Oryza sativa) diseases worldwide. SB resistance (SBR) is controlled by quantitative trait loci (QTL). Only a few SB resistance QTLs were confirmed previously in field trials that were independent of morphological traits, a crucial factor in plant breeding. Here, we employed 63 chromosome segment substitution lines (CSSLs) to identify SBR QTLs derived from 'HJX74'. Importantly, these CSSLs all carried the same genetic background as 'HJX74', except in the substituted segment introgressed from susceptible 'Amol3(sona)'. In contrast to most reports that mapped SBR QTLs under complex genetic backgrounds, this approach allowed many CSSLs to consistently retain the agronomic traits of 'HJX74' with moderate resistance, giving the needed high reproducibility in SBR scoring. We have identified five SBR QTLs in field tests. Two of them, qSB11(HJX74) and qSB1-1(HJX74), conferred the greatest reduction in SB ratings by approximately 0.9 to 1.2 on a 0 to 9 scale. qSB11(HJX74) exhibited nearly perfect recessive heredity, whereas qSB(HJX74) 4 showed dominant heredity. Using a secondary F-2 population and overlapping substitution segment lines, we further mapped qSB11(HJX74) and qSB1-1(HJX74) to regions of approximately 430 and 930 kb, respectively. The results will accelerate the rice breeding process for resistance to SB disease.

引用

页码：1112 / 1121

页数：10