弯孢菌引起的变色米初步研究

 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)。

A PRELIMINARY STUDY ON DISCOLORED RICE GRAINS CAUSED BY CURVULARIA

This paper reported symptoms of discolored rice grains, species and their pathogenicity on rice caused by the Curvularia.The symptoms varied with the species of Curvularia, varieties of rice and methods of incoulation.Five symptoms, the entirely dark brown, semi-darkbrown, dark brown lesions, dark brown spots and discoloration were usually observed on rice grains, and the light to deep black symptoms on the husted rice.The nine of Curvularia were isolated on discolored rice grains from different regions of China, which were C.lunata, C.genicu-ata, C.affinis, C.inaequalis, C.intermedia, C.clavata, C.pallescense, C.eragrostidis and C.fallax, of which six species (C.inaequalis, C.intermedia, C.clavata, C.pall-escens, C.eragrostidis and C.fallax) were first reported in China.The results of the artificial inoculation of the species on rice from booting stage to flowering showed all the species were virulent and produced a great number of discolor-ed rice grains.