摘要
1991—1992年对水稻恶苗病进行了不同鉴定方法、单一菌株与混合菌株接种、抗性分级标准,品种抗病性鉴定及 F_2代抗、感分离比率的研究。结果表明,水稻芽期浸菌接种法能明显区分不同品种(系)的抗感水平,且简便易行,适用于大量品种的筛选;采用不同地区混合菌株接种可扩大致病谱,其平均致病率也接近单一菌株的平均值;划分出抗性分级标准0—9级;据对204份品种(系)的鉴定,水稻品种(系)间抗性有明显差异,苗期抗性与成株期抗性并不一致,且筛选出抗—中抗材料7份;F_2代组合间抗、感比差异明显,其抗性差异与亲本有关。
In 1991-1992,the methodology for evaluation and screening of rice va-rieties and germplasm for resistance to bakanae disease was studied.Thebud soaking inoculation was proved a simple and easy method forscreening a large number of varieties;use of mixed races from differentareas had an advantage in expanding disease spectrum.The average ofits pathogenecity rate was close to all single race.A resistance gradingstandard of 0-9 classes was evaluated.In 204 varieties examined therewas significant difference in disease resistance which was not consistant between seedling and adult plants and seven resistant moderately re-sistant varieties had been screened out.The ratio of R-and S-proge-nies F_2 generation of cross combinations were obviously different andrelating to their parents.
出处
《植物保护学报》
CAS
CSCD
北大核心
1993年第4期289-293,共5页
Journal of Plant Protection
关键词
恶苗病
抗病性
水稻
选择育种
Gibberella fujikuroi
disease resistance
screening way
grading standard
