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弯孢菌引起的变色米初步研究 总被引:17,自引:0,他引:17
本文报道了弯孢菌引起的变色米的症状,弯孢苗的种类及其对水稻的致病性。变色米的症状,因水稻品种、弯孢菌种类和接种方法而有差异,但一般在糙米上为浅至深色的褐色米;在稻谷上产生全褐型、半褐型、褐斑型、褐点型和退色型五种类型。后各地采集的变色谷(米)上分离到弯孢属9个种,即新月弯孢、膝曲弯孢、近缘弯孢、不正弯孢、中隔弯孢、棒状弯孢、苍白弯孢、画眉弯孢、假弯孢,其中6个种为国内首次报道。据在水稻孕穗至开花期人工接种结果,上述9个种对水稻均有致病性,并产生大量的变色谷(米)。 相似文献
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本文研究了巴氏新小绥螨Neoseiulus barkeri以水稻干尖线虫Aphelenchoides besseyi为食的生长发育特征及其对水稻干尖线虫的捕食功能.结果表明,巴氏新小绥螨以水稻干尖线虫为食时,能正常发育并完成生活史,其生长发育各个历期与取食腐食酪螨Tyrophagus putrescentiae相比无显... 相似文献
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Aphelenchoides besseyi is a major nematode pathogen in rice known as the causal agent of white tip disease. In the present study, A. besseyi was recovered from 32 seed samples collected from the major rice-growing regions in China. Nine mitochondrial COI haplotypes and 95 ITS genotypes were identified, suggesting a high genetic diversity and endemism level of A. besseyi in China. Therefore, A. besseyi is likely to have experienced a long history of host–parasite coevolution in China, rather than being recently introduced from other countries. The results of population structure analysis indicated the presence of four clusters within Chinese A. besseyi, but these did not correspond to their geographic distribution. Haplotype H2 was found to be the most widespread. Haplotypes H9 and H13 were most genetically divergent and have been recognized as two cryptic species by molecular species delimitation methods, and with limited support from morphometric measurements. The COI-based phylogeny suggested the ability to parasitize rice has independently evolved at least four times in the genus Aphelenchoides. 相似文献
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江苏省水稻区试品种(系)对白叶枯病的抗性分析 总被引:2,自引:0,他引:2
通过 1996~2000年213份江苏省水稻区试品种(系)对水稻白叶枯病抗性鉴定 ,抗性较好的品种有94-44、96218、镇稻272、汕优抗63、汕优084、金优63、109、701、7057、9510、9619、5-172、92-133、扬粳7057、泗稻98-3789、新108、镇稻 99、44/157、9522等品种 ,其中 9510、9522等在生产上推广面积较大。试验表明 ,江苏省区试品种 (系 )中常规中籼、杂交籼稻和杂交中粳稻对水稻白叶枯病抗性较差 ,全抗率分别为36.4 %、27.3%和43.3% ,而中粳稻、单季晚粳和杂交晚粳稻对水稻白叶枯病的全抗率为67.2%、71.4%和72.2% ,抗性相对较好。根据白叶枯病菌不同致病型菌株对参试品种致病率的分布情况分析 ,浙173菌株 (致病型Ⅳ)对杂交中籼、常规中粳稻和杂交中粳稻的致病率较高。这种情况和Ⅳ型菌为江苏省白叶枯病主要致病型相一致。 相似文献