水稻分子育种亲本材料在东北地区的稻瘟病抗性评价

Screening and Evaluation of Rice Germplasm Resources Resistant to Rice Blast Pathogen Derived from North-eastern Region

对212份分子育种亲本在稻瘟病重发区自然鉴定圃进行田间抗性鉴定,发现分别有117个和39个品种对叶瘟和穗颈瘟表现抗性,19个品种对叶瘟和穗颈瘟均表现中抗以上抗性,叶瘟与穗颈瘟发病严重度存在显著相关性。进一步利用辽宁和黑龙江的混合菌株在水稻苗期,对田间苗期和成株期均表现抗病的19个品种进行人工接种鉴定,分别筛选出对辽宁东港、沈阳和其它4个地点混合菌株表现抗性的品种分别为13个、17个和6个;对黑龙江混合菌株表现抗病的品种2个。Pokhreli对来源辽宁和黑龙江的多菌株均表现抗病性。上述结果为辽宁和黑龙江水稻抗稻瘟病育种提供了有用的信息。

In this study,the resistance of 212 rice varities,which were used in molecular breeding program,were screened at blast nursery in Liaoning Province.The results showed that 117 and 39 varieties were resistant to Magnaporthe grisea at the seedling stage and adult stage,respectively.There was significantly correlation between the resistance at the two stages,and among them,19 varieties exhibited mid-resistance to leaf blast and panicle blast.In addition,the resistance of 19 rice varieties was further evaluated by artificial inoculated in greenhouse at the seeding stage.13,17,6 and 2 rice varieties were resistant to the mixed strains derived from Donggang,Shenyang,other locations in Liaoning,and Heilongjiang,respectively.Pokhreli was resistant to the isolates of rice blast pathogen from Liaoning and Heilongjiang.Our results will provide useful information for rice breeding resistant to blast in Liaoning and Heilongjiang province.