云南地方稻种资源的抗瘟性研究

 以B40、Tetep为感、抗稻瘟病对照，在全国4个病区病圃(云南保山、湖南烟溪、辽宁丹东、广东从化)采用自然诱发，鉴定了７４份云南地方稻种资源的抗瘟性。结果表明，感病对照B40在苗期病斑孢子层级、严重度、病斑叶面积率、穗颈瘟发病率均表现高感；抗病对照Tetep分别为１级、４级、5.5％和4.79％；Moroberekan前3个指标分别为3级、3级和１.２％，其穗颈瘟发病率较高，达到12.0％。云南地方稻种中，毫弄早、毫玉浪、大白谷等３个品种在这4个指标上表现抗病；在这4个病圃中，它们对稻瘟病的抗性比Tetep和Moroberekan更强、更稳定；毫马粉、孟先大白谷等2个品种在前3个指标上表现抗病，但感穗颈瘟。

Study on the Resistance to Rice Blast of Yunnan Conventional Rice Germplasms

In contrast with B40(susceptible) and Tetep, Moroberekan (resistant), the blast resistance of 74 Yunnan conventional rice germplasms were identified at four sites: Baoshan,Yunnan; Yanxi,Hunan; Dandong, Liaoning; and Conghua, Guangdong. The results indicated that B40 was highly susceptible to rice blast; the seedling blast severities, percentage of leaf lesion area, spore layer scales of lesion, and panicle blast of Tetep were 1 grade, 4 grade, 5.5%, 4.79%, respectively. Those of Moroberekan were 3 grade, 3 grade, 1.2%, 12.0%, respectively. On the other hand, Haonongzao, Haoyulang and Dabaigu were resistant at those indices, their resistances to rice blast are higher than that of Tetep and Moroberekan at four sites. Haomafen and Menxiandabaigu were resistant at three of indices, but susceptible to panicle blast.