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首页> 外文期刊>Journal of Nematology, with Annual of Applied Nematology >Population Dynamics of Dactylella oviparasitica and Heterodera schachtii: Toward a Decision Model for Sugar Beet Planting
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Population Dynamics of Dactylella oviparasitica and Heterodera schachtii: Toward a Decision Model for Sugar Beet Planting

机译：产卵小球藻和Schtertisch的种群动态：建立甜菜种植决策模型

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摘要

A series of experiments were performed to examine the population dynamics of the sugarbeet cyst nematode, Heterodera schachtii, and the nematophagus fungus Dactylella oviparasitica. After two nematode generations, the population densities of H. schachtiiwere measured in relation to various initial infestation densities of both D. oviparasitica and H. schachtii. In general, higher initial population densities of D. oviparasitica were associated with lower final population densities of H. schachtii. Regression models showed that the initial densities of D. oviparasitica were only significant when predicting the final densities of H. schachtii]2 and eggs as well as fungal egg parasitism, while the initial densities of J2 were significant for all finalH. schachtii population density measurements. We also showed that the densities of H. schachtii-associated D. oviparasitica fluctuate greatly, with rRNA gene numbers going from zero in most field-soil-collected cysts to an average of 4.24 x 108 in mature females isolated directly from root surfaces. Finally, phylogenetic analysis of rRNA genes suggested that D. oviparasitica belongs to a clade of nematophagous fungi that includes Arkansas Fungus strain L (ARF-L) and that these fungi are widely distributed. We anticipate that these findings will provide foundational data facilitating the development of more effective decision models for sugar beet planting.
机译：进行了一系列实验，以检验甜菜囊肿线虫，Schtertii和线虫真菌Dovylella oviparasitica的种群动态。在两个线虫世代之后，测量了沙氏嗜血杆菌的种群密度，其与卵圆线虫和沙氏嗜血杆菌的各种初始侵染密度有关。通常，较高的D. oviparasitica初始种群密度与较低的Sch。schachtii最终种群密度有关。回归模型表明，仅当预测沙门氏菌2和卵的最终密度以及真菌卵寄生时，卵圆线虫的初始密度才有意义，而对于所有finalH，J2的初始密度才有意义。 Schachtii人口密度测量。我们还显示，与沙特氏菌相关的D. oviparasitica的密度波动很大，在大多数从田间土壤收集的囊肿中，rRNA基因的数量从零增加到直接从根表面分离的成熟雌性的平均4.24 x 108。最后，rRNA基因的系统发育分析表明，D。oviparasitica属于线虫真菌进化枝，其中包括阿肯色真菌L（ARF-L），并且这些真菌广泛分布。我们预计，这些发现将为促进甜菜种植更有效的决策模型的开发提供基础数据。

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