作　　者： ; ; ; ; ; ;

机构地区： 广东海洋大学农学院

出　　处： 《植物病理学报》 2009年第6期584-592,共9页

摘　　要： 本文对来自红海榄(Rhizophora stylosa)赤斑病同一病斑上获得的2个菌株PⅠ-1和PⅡ-3进行了鉴定和生物学特性研究。结果表明,PⅡ-3菌株的致病力比PⅠ-1的稍强;2个菌株均具有一定的寄主专化性。经形态特征观察与rDNA-ITS序列分析,2个菌株均鉴定为异色拟盘多毛孢(Pestalotiopsis versicolor)。生物学特性测定结果表明,温度、pH值和光照对2个菌株菌丝生长及孢子萌发的影响差异不大,生长温度均为10～32℃(最适25℃),pH值为3.0～10.9(最适4.0);孢子萌发温度均为10～35℃(最适25～28℃),pH值为2.5～8.0(最适3.0);黑暗条件有利于2个菌株菌丝生长和孢子萌发。但2个菌株的产孢特性存在明显差异,其中PⅠ-1产孢的最适温度为28℃而PⅡ-3为20℃;PⅠ-1产孢的最适pH值为5.1而PⅡ-3为9.0;PⅠ-1产孢对光照不敏感,而PⅡ-3在黑暗条件下几乎不产孢。另外,在相似条件下,PⅠ-1产孢量比PⅡ-3大,而PⅡ-3菌丝生长速度比PⅠ-1快,孢子萌发率也比PⅠ-1高。由此可见,2个菌株PⅠ-1和PⅡ-3虽属于同一个种,但某些生物学特性存在一定的差异。 The identification and the biological characteristics of the strains PⅠ-1 and PⅡ-3 isolated from the same leaf spot of Rhizophora stylosa were studied.The pathogenicity of PⅡ-3 was stronger than that of PⅠ-1 and their hosts were special to a certain extent.The two pathogenic strains were all identified as Pestalotiopsis versicolor based on the morphological characters as well as ribosomal DNA-ITS sequences.The biological characteristics of the two strains showed that the effects of temperature,pH and light ...

关 键 词： 红海榄 异色拟盘多毛孢 病原鉴定 生物学特性

领　　域： [农业科学] [农业科学] [农业科学]