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Analysis of the Abnormal Segregation of Pathogenicity in magnaporthe grisea by Using a Genetic Cross of Oryza and Eleusine Isolates

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Agricultural Sciences in China 2010年第3期9卷 383-391页

作者： YIN Liang-fen LUO Chao-xi kusaba m.toaki Yaegashi Hiroshi Department of Plant Pathology College of Plant Science and Technology Huazhong Agricultural University Wuhan 430070 P.R.China Key Lab of Crop Disease monitoring ＆ Safety Control in Hubei Province Huazhong Agricultural University Wuhan 430070 P.R.China Faculty of Agriculture Saga University Saga 840-8502 Japan

A genetic cross between Oryza isolate Y93-164a-1 and Eleusine isolate SA98-4 was established, and the pathogenicity of 151 F1 progeny isolates was investigated on both host plants rice and finger millet. Results showed that the segregation of pathogenicity in this genetic cross was abnormal, i.e., most of the progeny isolates were nonpathogenic on both host plants. However, no abnormal segregation was observed when middle repetitive sequence mGR586 and 31 single-copy RFLP markers from all of the chromosomes were genetically analyzed. At the same time, comparison of the chromosomal organization among two pairs of parental isolates did not find any genomic abnormity. These results suggested that the ＂abnormal＂ inheritance of pathogenicity in this cross was most likely due to the reassortment of numerous host species specificity genes but not the biased segregation of the host species specificity genes. The host species specificities in m. grisea were likely to be multigenically controlled, at least in the genetic cross involving rice pathogen and the grasses pathogen other than rice.

关键词： magnaporthe grisea rice blast fungus host species specificity pathogenicity contour-clamped homogeneous electric field (CHEF) electrophoresis Southern hybridization

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INFLUENCES OF EDGING ROLL SHAPE ON THE PLASTIC STRAIN DISTRIBUTION OF SLAB DURING mULTI-PASS V-H ROLLING PROCESS

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Acta metallurgica Sinica(English Letters) 2006年第1期19卷 51-56页

作者： H.L. Yu X.H. Liu C.S. Li X.m. Zhao Y. kusaba The State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110004 China Sumitomo metal Induswies Ltd. Japan 6000891 Amagaski 660 JapanManuscript received 7 April 2005 in revised form 8 August 2005

multi-pass slab vertical-horizontal （V-H） rolling process with variable edging roll shape have been simulated with explicit dynamic finite element method and updating geometric method. The distributions of plastic strain contour in slab daring rolling process with different edging roll and under different rolling stage have been obtained. The results show that there exist two thin strain assembling zones in slab when the flat edging roll is used, and there just exist one strain assembling zone in slab when the edging roll with groove is used. And compared the deformation equality between flat edging roll and edging roll with groove, the lateris better than the former, which supplies the theory prove to the slab deformation distribution during V-H rolling process and is helpful for predicting the slab texture.

关键词： strain V-H rolling multi-pass finite element method (FEm),updating geometric method

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Study on Parasexual Recombination between <i>Pyricularia oryzae</i>and <i>Pyricularia grisea</i>

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Agricultural Sciences 2018年第3期9卷 317-339页

作者： m. A. monsur m. kusaba Laboratory of Plant Pathology Faculty of Agriculture Saga University Saga Japan Plant Pathology Division Bangladesh Rice Research Institute Gazipur Bangladesh

Rice blast fungus is notorious for changeability in pathogenicity, but it lacks sexual life cycle. It can be postulated that such an imperfect fungus has another mechanism for generating genetic variations. Recent studies concerning comparative genomics reveal that parasexual recombination may play important role in the evolution of rice blast fungus. To observe the parasexualism of rice blast (Pyricularia oryzae) and crabgrass blast (Pyricularia grisea) fungus double inoculation and punch method were applied in this experiment. A total of 520 isolates collected from the double inoculated lesions was subjected to PCR-RFLP analysis of the ITS region to identify subcultures of the inoculated rice blast isolates. As a result, four isolates from the three double inoculated lesions with SA13-1mE and TP106 were identified as subcultures of TP106. To access the recombination genotypes, a total of 17 isolates from the three lesions was subjected to mAGGY-DNA fingerprint analysis. However, recombinant DNA fingerprint patterns between TP106 and SA13-1mE were not detected among the 17 isolates. Although TP022 was not recovered from the double inoculated lesions, the fact that TP106 was recovered from the double inoculated lesion indicates that rice blast fungus can invade and colonized in blast lesion on crabgrass. The opportunistic infection on the double inoculated lesions observed in this study potentially provides new insight into the life cycle of rice blast pathogen.

关键词： Rice Blast Parasexual Double Inoculation Punch

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稻瘟病菌链状分生孢子形成突变体的研究(英文)

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西南农业学报 2001年第3期14卷 6-12页

作者： m.kusaba H.URATA Y.FUKUNAGA 罗朝喜李成云 H.YAEGASHI 日本佐贺大学农学系云南省农业科学院生物技术研究所云南昆明650223

通过三种途径得到了稻瘟病菌产生链状着生分生孢子的突变体菌株 ,并对这些突变菌株的DNA指纹图谱、致病性及孢子形成等特性与原菌株分别作了比较研究。用复合位点探针mAGGY和mGR5 86进行的DNA指纹图谱分析结果表明 ,这些突变体确系野生... 详细信息

通过三种途径得到了稻瘟病菌产生链状着生分生孢子的突变体菌株 ,并对这些突变菌株的DNA指纹图谱、致病性及孢子形成等特性与原菌株分别作了比较研究。用复合位点探针mAGGY和mGR5 86进行的DNA指纹图谱分析结果表明 ,这些突变体确系野生型稻瘟病菌的突变体。虽然这些突变菌株都能产生病斑 ,但其致病性较野生型菌株有明显下降。叶鞘接种结果表明 ,所用突变菌株均能形成附着孢并能穿透寄主细胞壁。突变菌株能形成链状着生的分生孢子 ,多数有两个分隔 ,呈弯膝形或长镰刀状 ,透明或灰橄榄色。突变菌株在病斑上和燕麦片培养基上都能产生链状着生的分生孢子 ,也能产生正常的分生孢子。通过单孢分离后 ,在燕麦片培养基上形成的两种孢子的比例基本稳定。

关键词：稻瘟病菌形态突变体链状分生孢子 DNA指纹图谱致病性

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