药用野生稻杂交后代对稻瘟病的抗性
2017-03-21杨士杰
杨士杰
摘要:以Tetep、B40为抗、感对照品种,采用自然诱发,鉴定药用野生稻(Oryza officinalis Wall.)与栽培稻(Oryza sativa L.)杂交后代对稻瘟病的抗性。结果表明,以黑选A为母本与药用野生稻杂交的后代AC-1、AC-2、AC-3叶瘟病级严重度均为3级,病斑孢子层级均为1级,与药用野生稻亲本一致,表现中抗;但杂交后代AC-4发生分化,其叶瘟病级严重度达7级,病斑孢子層级为5级,与母本黑选A一致,表现感病。
关键词:药用野生稻(Oryza officinalis Wall.);栽培稻(Oryza sativa L.);杂交后代;稻瘟病;抗性
中图分类号:S435.111.4+1;S511.9 文献标识码:A 文章编号:0439-8114(2017)03-0415-03
DOI:10.14088/j.cnki.issn0439-8114.2017.03.005
Rice Blast Resistance of Hybrid Offspring of Medicinal Wild Rice
YANG Shi-jie
(College of Life Science and Resources Environment, Yichun University, Yichun 336000, Jiangxi, China)
Abstract: With Tetep (resistant) and B40 (susceptible) as contrast, rice blast resistance of hybrid offspring between medicinal wild rice(Oryza officinalis Wall.) and cultivated rice(Oryza sativa L.) were identified by natural induction. The results showed that the leaf blast level severity of AC-1、AC-2、AC-3 that the hybrid progenies of black A as female parent and medicinal wild rice were grade 3, lesion of spore layer of them was level 1, and had no difference with medicinal wild rice parents in anti, belonged to middle resistance. But hybrid AC-4 occurred differentiation, the leaf blast serious degree was up to 7, lesion of spore layer was grade 5, and was consistent with female parent black A, showed susceptibility.
Key words: Oryza officinalis Wall.; Oryza sativa L.; hybrid offspring; rice blast; resistance
药用野生稻(Oryza officinalis Wall.)长期处于野生状态,经受各种灾害和环境的自然选择,形成了丰富的变异类型,对水稻多种病虫害表现出较强的抗性和耐受性。将药用野生稻抗性资源转移到栽培稻(Oryza sativa L.)中,以提高栽培稻抗病虫性,是防治水稻病虫经济、有效的措施。但药用野生稻和栽培稻染色体组分属于CC型和AA型[1,2],杂交亲和性小,直接获得杂交种子难度大。近年来,采用胚拯救技术,利用雄性不育性遗传背景等方法可获得发育正常的杂交种子。1991年江西省宜春学院生命科学与资源环境学院遗传育种室以黑选A为母本与药用野生稻杂交得到杂交种子,经后代处理和多代选择获得了稳定的株系[3]。多年来,笔者对这些野生稻与栽培稻杂交后代株系陆续进行了抗虫、抗病试验,现将杂交后代对稻瘟病抗性试验结果报告如下。
1 材料与方法
1.1 供试材料
用江西省宜春学院生命科学与资源环境学院遗传育种室转育的质核互作型雄性不育系黑选……
