摘要
芒是位于植物穗上的针状结构,广泛存在于禾本科作物水稻、小麦、高粱和大麦中,不同作物芒的结构存在差异。小麦中,芒对提高穗光合效率和产量、防鸟、抗虫及抗逆有重要作用。前人已经对抑制小麦芒发育的主要基因进行了定位和遗传分析,4个主效基因中仅有B1(Tipped1)基因被克隆。本研究基于人工群体云南3号和偃展1号BC_3F_6群体(YN3/YZ1)和自然群体,分析了芒与其他农艺性状的关系,发现芒对株高和产量性状有显著影响;用小麦660K SNP芯片扫描YN3/YZ1和自然群体,全基因组关联分析(GWAS)显示小麦染色体5AL和6BL存在与芒性状显著相关的基因组区域,分别对应于小麦芒抑制基因B1和B2;长芒和顶芒近等基因系转录组分析发现,在6BL候选区间内有23个差异表达基因。本研究将为进一步克隆B2基因提供参考。
Awn is a needle-like structure located on the ear of plants.It is widely found in the grass family such as rice,wheat,sorghum and barley,and the structure of awn varies in different crops.In wheat,awn plays an important role in improving the photosynthetic efficiency and yield,and in preventing damages caused by pest birds,insects and adverse conditions.Genes related to the development of wheat awn have already been mapped and genetically analyzed,but only one of the four major awn-inhibiting genes,B1(Tipped1),has been cloned.In this study,conducted on a BC3F6 genetic population(YN3/YZ1)and a natural population,we estimated the relationship between the awn and agronomic traits,and found that awn had significant effects on plant height and yield.Genome-wide association studies(GWAS)based on wheat 660 K SNP array identified genomic regions on chromosomes 5AL and 6BL significantly related to awn trait,which corresponded to awn-inhibiting genes B1 and B2 respectively.From transcriptome data of long-awned and tip-awned near-isogenic lines(NILs),23 differentially expressed genes were identified from the 6BL candidate interval.These results will facilitate the B2 gene cloning in the future.
作者
李玲
刘盼
张蕾
张浩
贾继增
高丽锋
LI Ling;LIU Pan;ZHANG Lei;ZHANG Hao;JIA Ji-zeng;GAO Li-feng(Institute of Crop Sciences,Chinese Academy of Agricultural Sciences,Beijing 100081)
出处
《植物遗传资源学报》
CAS
CSCD
北大核心
2021年第1期102-114,共13页
Journal of Plant Genetic Resources
基金
国家自然科学基金项目(31971882)。
