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首页> 外文期刊>Journal of Nematology, with Annual of Applied Nematology >Assessing Heterodera giyclnes-Resistant and Susceptible Cultivar Yield Response
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Assessing Heterodera giyclnes-Resistant and Susceptible Cultivar Yield Response

机译：评估杂种变种-抗性和易感品种的产量反应

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摘要

The soybean cyst nematode Heterodera glycines (SCN) is of major economic importance and widely distributed throughout soybean production regions of the United States where different maturity groups with the same sources of SCN resistance are grown. The objective of this study was to assess SCN-resistant and -susceptible soybean yield responses in infested soils across the north-central region. In 1994 and 1995, eight SCN-resistant and eight SCN-susceptible public soybean cultivars representing maturity groups (MG) I to IV were planted in 63 fields, either infested or noninfested, in 10 states in the north-central United States. Soil samples were taken to determine initial SCN population density and race, and soil classification. Data were grouped for analysis by adaptation based on MG zones. Soybean yields were 658 to 3,840 kg/ha across the sites. Soybean cyst nematode-resistant cultivars yielded better at SCN-infested sites but lost this superiority to susceptible soybean cultivars at noninfestedsites. Interactions were observed among initial SCN population density, cultivar, and location. This study showed that no region-wide predictive equations could be developed for yield loss based on initial nematode populations in the soil and that yieldloss due to SCN in our region was greatly confounded by other stress factors, which included temperature and moisture extremes.
机译：大豆孢囊线虫异戊二烯甘氨酸（SCN）具有重要的经济意义，并且广泛分布在美国的整个大豆生产地区，这些地区种植了具有相同SCN抗性来源的不同成熟群体。这项研究的目的是评估中北部地区受侵染土壤中抗SCN和易感大豆产量的反应。在1994年和1995年，在美国中北部的10个州中，有63个田地（有病或无病）种植了八个分别代表I至IV成熟组（MG）的抗SCN和8个对SCN敏感的公共大豆品种。取土壤样品以确定初始SCN种群密度和种族，以及土壤分类。根据MG区域对数据进行分组以进行分析。这些地点的大豆单产为658至3,840公斤/公顷。大豆囊肿线虫抗性品种在受SCN侵染的地区收成较好，但与未受侵染的大豆易感品种相比却失去了这种优势。在初始SCN种群密度，栽培品种和位置之间观察到相互作用。这项研究表明，不能根据土壤中最初的线虫种群为产量损失建立整个区域的预测方程，而且我们地区由于SCN引起的产量损失与其他应力因素（包括温度和湿度极端值）大为混淆。

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