小麦拟坏死营养症状基因与赤霉病扩展抗性的分析  

Associations of lesion mimic with type Ⅱ resistance to fusarium head blight in wheat

作　　者：李韬[1] Bai Gui-hua 兰国防[1] 周霞丽[1] 顾世梁[1] 

机构地区：[1]扬州大学江苏省作物遗传生理重点实验室／教育部植物功能基因组学重点实验室,江苏扬州225009 [2]美国农业部农业试验站硬冬小麦遗传研究中心,堪萨斯曼哈顿,66506

出　　处：《扬州大学学报（农业与生命科学版）》2010年第4期36-39,49,共5页Journal of Yangzhou University：Agricultural and Life Science Edition

基　　金：江苏省自然科学基金资助项目(BK2010312);扬州大学培育创新基金项目(2008CXJ023)

摘　　要：以宁7840和韩国品种Chokwang衍生的F10代重组近交系(RIL)群体为材料,研究拟坏死营养性症状与小麦赤霉病扩展抗性的关系。结果表明:拟坏死症状与赤霉病扩展抗性显著相关,具有坏死营养症状的RIL其病小穗率(PSS)显著低于没有该性状的株系。位于3BS上的Fhb1能够解释21%的表型变异,而拟坏死营养症状(Lesion mi mic,LM)基因对PSS的影响基本独立于Fhb1,二者没有显著的互作关系。这表明LM性状的表达具有一因多效作用,能够介导小麦的广谱抗性,对活体营养性病原菌引起的病害(如小麦锈病)和腐生营养性病原菌引起的赤霉病均有抑制作用,这类广谱基因在育种中可能具有重要的应用价值。Spontaneous hypersensitive-response（HR）-like and naturally occurring lesion mimic（LM） resembling the initial infection of leaf rust was observed in Chinese wheat cv.Ning7840 around heading at adult stage.The main objective of this paper was to investigate the effects of the LM on the resistances to fusarium head blight（FHB） in wheat caused by necrotrophic pathogen Fusarium graminearum.The gene responsible for LM significantly associated with type Ⅱ resistance to FHB in respect of the percentage of scabbed spikelets（PSS）.Lines with LM phenotype showed significantly lower PSS than the non-LM lines in FHB.lm reduced PSS independence of Fhb1,a major gene/QTL responsible for type Ⅱ resistance to FHB on 3BS chromosome.Therefore,the gene responsible for LM in Ning7840 may have pleiotropic effect,which could be beneficial to the development of wheat cultivars with broad-spectrum and durable resistance.

关 键 词：小麦 拟坏死症状 赤霉病 

分 类 号：S512.032[农业科学—作物学]