江苏省农业科学院,江苏 南京,210014
张维(1986- ),女,副研究员,硕士,主要从事油菜种质创新与遗传育种研究,E-mail: 20130032@jaas.ac.cn
沈悦(1986- ),女,副研究员,博士,主要从事油菜种质创新与遗传育种研究,E-mail: syjaas@163.com
收稿:2026-08-31,
纸质出版:2026-10-25
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张维,罗升,杨廷海等.盐胁迫下甘蓝型油菜苗期根系性状的全基因组关联分析[J].中国油料作物学报,2026,48(05):53-63.
ZHANG Wei,LUO Sheng,YANG Ting-hai,et al.Genome-wide association study of root traits in Brassica napus L. seedlings under salt stress[J].Chinese Journal of Oil Crop Sciences,2026,48(05):53-63.
张维,罗升,杨廷海等.盐胁迫下甘蓝型油菜苗期根系性状的全基因组关联分析[J].中国油料作物学报,2026,48(05):53-63. DOI: 10.19802/j.issn.1007-9084.2026294.
ZHANG Wei,LUO Sheng,YANG Ting-hai,et al.Genome-wide association study of root traits in Brassica napus L. seedlings under salt stress[J].Chinese Journal of Oil Crop Sciences,2026,48(05):53-63. DOI: 10.19802/j.issn.1007-9084.2026294.
土壤盐渍化是制约油菜生产的主要非生物胁迫因子,根系作为感知盐胁迫的首要器官,其构型与耐盐性密切相关。为解析盐胁迫下甘蓝型油菜根系性状的遗传机制,以202份甘蓝型油菜种质资源为材料,测定盐胁迫下相对根长、相对根表面积、相对根体积和相对根尖数4个性状,结合全基因组重测序数据,采用混合线性模型进行全基因组关联分析。结果表明,4个性状表型变异丰富且呈极显著正相关;共获得120个高置信度关联SNP,整合为70个候选区间,结合转录组与基因注释初步筛选到6个根系耐盐候选基因;经主成分分析和隶属函数综合评价,筛选出6份强耐盐种质。本研究为解析甘蓝型油菜根系耐盐分子机制提供了新位点和候选基因。
Soil salinization is a major abiotic stress restricting rapeseed production. As the primary organ sensing salt stress
root architecture is closely associated with salt tolerance. To dissect the genetic mechanism underlying salt tolerance in roots of
Brassica napus
a natural population consisting of 202
B. napus
accessions was used as material. 4 root salt-tolerance traits
including relative root length
relative root surface area
relative root volume and relative root tip number
were measured under salt stress. Combined with resequencing data
a mixed linear model was adopted to perform genome-wide association study. The results revealed abundant phenotypic variation in the 4 root traits
with extremely significant positive correlations observed among them. A total of 120 significantly associated single-nucleotide polymorphisms (SNPs) were detected
which were integrated into 70 candidate association intervals. 6 candidate genes responsible for root salt tolerance were ultimately selected by integrating transcriptomic data and gene functional annotation. Comprehensive evaluation of root salt tolerance was performed using principal component analysis and membership function
and 6 germplasm resources with strong salt tol
erance were screened out. This study provides novel loci and candidate genes for dissecting the molecular genetic mechanism of root salt tolerance in
B. napus
.
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