四川省主要水稻品种抗稻瘟病性评价及病菌生理小种监测

Identification of Resistance to Blast of Main Rice Varieties and Monitoring on the Physiological Races of Rice Blast Fungus in Sichuan Province

对四川省 30个主要杂交稻品种抗稻瘟病性鉴定结果表明 ,叶瘟 4～ 5级、颈瘟 1～ 5级 ,表现抗和中抗的品种有Ⅱ优 44 8,冈优 1 82 ,菲优多 1 ,冈优多 1 ,汕优多 1和冈优 6 1 5等 1 8个。对来自四川省主栽品种冈优 2 2、汕优多1等品种上的稻瘟病菌 1 75个有效单孢菌株测定结果表明 ,病菌生理小种由 6群 44个小种组成 ,以ZB群为优势种群 ,出现频率为 49 71 % ,其次 ,ZA ,ZC群出现频率分别为 1 8 2 9%和 2 3 4 3%

In 1999, blast(Pyricularia oryzae)resistance of 30 main hybrid rice varieties were identified in natural nursery of leaf and panicle blast in Sichuan Province With leaf blast 4-5 scales and Panicle blast l-5 scales, resistant and mid-resistant to blast were 18 varieties, such as Ⅱ you 448, Gangyou 182, Feiyouduo 1, Gangyouduo 1, Shanyouduo 1 ,Gongyou 615 etc 175 Strains of rice blast fungus collected from the widely culivated rice varieties Gangyou 22 and Shanyouduo 1 in Sichuan were tested The resuls showed the physiological races of the pathogen were composed of 6 groups involving 44 races, and ZB group was dominant with a frequency of 49 71%, and ZA group with a frequency of 18 29%, and ZC group with a frequency of 23 43%.