Effects of host plant genotype and seedbank density on Striga reproduction
Effects of host plant genotype and seedbank density on Striga reproduction
复制标题
寄主植物基因型和种子库密度对独脚金繁殖的影响
DOI：
10.1111/j.1365-3180.2006.00506.x
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发表时间：
2006
期刊：
影响因子：
1.7
通讯作者：
A. Ast
中科院分区：
文献类型：
--
作者：
J. Rodenburg;L. Bastiaans;M. Kropff;A. Ast
防止种子输入稻田种子库是稻田管理的一个重要目标。在马里连续3年的田间试验中，研究了10个高粱品种在30 000~200 000粒种子−2侵染水平下的稻瘟繁殖情况。寄主抗性是稻瘟病菌繁殖的一个重要决定因素，其中抗性最强的3个品种(N13、IS9830和SRN39)使稻瘟病菌的繁殖率比感病品种(CK60-B)降低了70~93%。种子库密度对Striga种子产量有显著影响。更高的种子库密度导致更多的Striga植株，这导致种内竞争增加，从而降低了每株的繁殖水平。对高粱最敏感的品种，在地下前期也表现出密度依赖性。在收获后，Striga继续繁殖。在高侵染水平下，只有8%的繁殖是在收获后完成的，而在低侵染水平下，收获后达到39%。尽管寄主-植物的基因在Striga的繁殖中起着重要的作用，但计算表明，只有在非常低的侵染水平下，使用最具抗性的基因才能降低Striga的种子库。
Prevention of seed input to the seedbank of Striga hermonthica-infested fields is an important objective of Striga management. In three consecutive years of field experimentation in Mali, Striga reproduction was studied for 10 sorghum genotypes at infestation levels ranging from 30 000 to 200 000 seeds m−2. Host resistance was identified as an important determinant of Striga reproduction, with the most resistant genotypes (N13, IS9830 and SRN39) reducing Striga reproduction by 70–93% compared with the most susceptible genotype (CK60-B). Seedbank density had a significant effect on Striga seed production. Higher seedbank density resulted in more Striga plants, which led to increased intra-specific competition and consequently a reduced level of reproduction per plant. For the most susceptible sorghum genotypes, density dependence also occurred in the earlier belowground stages. Striga reproduction continued beyond harvest. At the high infestation level just 8% of the total reproduction was realised after harvest, whereas at the low infestation level 39% was attained after harvest. Even though host-plant genotype plays a significant role in Striga reproduction, calculations indicated that only at very low infestation levels the use of the most resistant genotype was able to lower the Striga seedbank.