Genetic variability of Striga asiatica (L.) Kuntz based on AFLP analysis and host-parasite interaction
Genetic variability of Striga asiatica (L.) Kuntz based on AFLP analysis and host-parasite interaction
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DOI：
10.1023/a:1021200213599
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发表时间：
2002-01-01
期刊：
影响因子：
1.9
通讯作者：
Timko, MP
中科院分区：
文献类型：
--
作者：
Botanga, CJ;Kling, JG;Timko, MP
采用AFLP分析方法估计了独脚金14个居群内和居群间的遗传变异。Kuntze从贝宁共和国的不同地点收集。群体内平均遗传距离为0.028 ~ 0.038，群体间平均遗传距离为0.019 ~ 0.088，假设最小遗传距离为0.01。种群内和种群间的变异反映了一个非常显着的R-2为0.61的地理距离与遗传距离的回归。不同的Striga种群与易感宿主基因型，8338-1（玉米）和CK 60 B（Sorghanbicolor）的相互作用，表明宿主专业化程度很高，CK 60 B未能支持任何种群的寄生虫生长。不同的独脚金种群也表现出不同程度的敏感寄主植物的毒力。我们的研究结果支持这一假设，即不同种群的这种寄生虫可以很好地考虑和处理的生态型在植物育种计划发展抗S。亚洲菜
AFLP analysis was used to estimate genetic variability within and among 14 populations of Striga asiatica L. Kuntze collected from different locations within the Republic of Benin. The mean within-population genetic distances ranged from 0.028 to 0.038, while the mean among-population genetic distances ranged from 0.019 to 0.088, with an assumed minimum genetic distance of 0.01 in each case. Intra- and inter-population variation was reflected by a highly significant R-2 of 0.61 for the regression of geographic distance versus genetic distance. Interactions of the different Striga populations with susceptible host genotypes, 8338-1 (Zea mays) and CK60B ( Sorghum bicolor), indicated a high degree of host-specialization, with CK60B failing to support growth of the parasite from any of the populations. The various Striga populations also exhibited different degrees of virulence on susceptible host plants. Our results support the hypothesis that different populations of this parasite may well be considered and treated as ecotypes in plant breeding programs developing resistance to S. asiatica.