微机确定甘薯瘟致病型的鉴别品种及应用研究
Determination of Pathogenic Forms of Sweetpotato Blast by Computer and lts Utilization
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摘要: 1984~1993年共测定福建省42个县(市)及广东、广西、淅江、江西等省11个县(市).甘薯瘟病(Acendomonas solanacearum)403个菌株,据其致病力强弱,划分为三个菌系群(Ⅰ~Ⅱ).从Ⅰ群到Ⅱ群致病力逐渐增强,分布最广的为Ⅰ群菌,占测定菌的45.66%;致病力最强的Ⅱ群菌,占测定菌的21.34%.菌株之间致病力表现为数量级差异,尚未发现有明显的特异性反应。甘薯瘟病菌分布特点是老病区又连续种植抗瘟品种的致病力强,新病区种不抗瘟品种的致病力弱,1988~1993年泉州、宁德、福州三地(市)薯瘟区按照测定出的各县甘薯瘟病菌系类型强、中、弱的区划分布种植相应的抗瘟品种累计面积达18.1万hm2,增收原粮1.5亿kg,增加社会经济效益1.45亿元。Abstract: During 1984 1993, 403 strains of sweetpotato bacterial wilt(Pseudomonas solanacearumm Smith).which were collected from 42 counties of Fujian and 11 counties from Guangdong,Guangxi, Zhejiang and JiangXi provinces were tested for their pathogenicity。 According to the vilu-lence.these strains were divided into three groups(Ⅰ-Ⅱ).The most widely distributed groupwas the first one),which made up 45.66 percent of the total strains tested.The third group(Ⅲ)was the strongest in virulence, account for 21.34 percent of the total strains。 All the strainstested showed quantitative difference in the virulence.No distinct specificity was found.The distribution of the strains was that, the strains stronger in virulence tended to be in old diseased areaswhere the resistant variety was cultivated, and the strains weaker in virulence existed in new dis-eased areas where the susceptible varieties were cultivated.The blast resistant variety was culti-vated 181 thousand ha.based on the distribution of the strains groups tested in Quanzhou, Ningdeand Fuzhou during 1988 1993.The calculated food increased was 1.5 hundred million kg.The so-cial and economic income increaed was 1.45 hundred million yuan.
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Key words:
- Sweetpotato /
- Strain /
- Computer /
- Psendomonas solanacearum /
- Rational layout
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