四川地方稻种资源抗稻瘟病鉴定及抗源的地理分布

THE IDENTIFICATION AND GEOGRAPHICAL DISTRIBUTION OF RESISTANCE OF SICHUAN LOCAL RICE GERMPLASM TO RICE BLAST

对3255份四川水稻地方品种的抗稻瘟病鉴定结果表明:四川地方稻种中存在有各种抗性资源,但抗苗瘟资源多于抗叶瘟和穗颈瘟资源。抗苗瘟资源以籼粘型品种为主,而抗穗颈瘟资源则以粳糯型品种居多。高抗或抗叶瘟和穗颈瘟或抗（中抗）“三瘟”的资源以粳糯型品种居多。对抗性资源的地理分布研究发现,抗苗瘟资源分布广,而抗叶瘟和穗颈瘟资源主要分布于盆周边缘地区,其次为川西南山区,特别是多抗资源,这一点对品种合理布局具有指导意义。

Resistance of 3255 Sichuan rice germplasm( O. Saliva. L. )to rice blast(Pyricularia oryzae Cav, )were identified- The results showed that there existed various kinds of resistant resources in the local rice germplasm. The germplasm resistant to seedling blast of rice were more than those resistant to leaf or neck blast.The germplasm resistant to seedling blast were mainly indica type non - waxy rice,and those resistant to ear neck or both leaf and neck blast were mainly japonica-type waxy rice. The geographical distribution of the rice germplasm resources resistant to rice blast were also analysed. The results indicated that the distribution range of the germplasm with resistance to seedling blast were wide and the germplasm with resistance to leaf or neck blast or both leaf and neck blast were mainly dispersed over peripheral basin mountain rice cropping zone and Southwest Sichuan mountain rice cropping zone.