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首页> 外文期刊>Journal of Nematology, with Annual of Applied Nematology >Relationships between initial population densities of Meloidogyne incognita race 2 and nematode population development in terms of variable soybean resistance
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Relationships between initial population densities of Meloidogyne incognita race 2 and nematode population development in terms of variable soybean resistance

机译：就可变大豆抗性而言，南方根结线虫第2种族的初始种群密度与线虫种群发育之间的关系

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摘要

The effect of increasing initial population density levels (Pi) of Meloidogyne incognita race 2 on nematode population development and yield of a susceptible (Prima2000) and resistant (LS5995) soybean cultivar was investigated. Two experiments, one ina hail net cage and one in microplots, were conducted one each during two consecutive growing seasons at Potchefstroom in the North West Province of South Africa. Nematode reproduction was assessed by determining the number of eggs and second-stage juveniles (J2) in the rhizosphere and roots, egg masses, egg-laying females (ELF) and reproduction factor (Rf) values per root system at harvesting 110 days after planting. Percentage yield reduction in the two cultivars was also calculated. Strong non-linear relationships existed between all nematode variables as well as between Pi and percentage yield loss in both cultivars for both experiments in this study. Significantly higher numbers of eggs and J2, egg masses and'ELF were maintained in the roots of the nematode-susceptible Prima2000 than in the resistant LS5995 from Pi = 100 and higher in both experiments. Rf values were inversely related to Pi for both cultivars and were lowest on LS5995, with Prima2000 maintaining significantly higher Rf values inboth experiments. Yield loss in LS5995 was at least six times higher than that of Prima2()00. The difference in monetary terms is demonstrated, although it is suggested that host plant resistance to plant-parasitic nematodes may not be sufficient as theonly management tool in highly infested soils or in rotation systems including nematode susceptible crops.
机译：研究了提高根结线虫第2种种族的初始种群密度水平（Pi）对线虫种群发育以及易感（Prima2000）和抗性（LS5995）大豆品种产量的影响。在南非西北省的Potchefstroom，在连续两个生长季节中，进行了两个实验，一个为ina a冰雹笼，一个为microplot，每个实验一个。通过确定种植后110天收获时根际和根中的卵和第二代幼虫（J2）的数量，根的卵质量，产卵雌虫（ELF）和每个根系的生殖因子（Rf）值来评估线虫的繁殖。还计算了两个品种的减产百分比。在本研究的两个实验中，两个品种的所有线虫变量之间以及Pi和产量损失百分比之间都存在很强的非线性关系。易受线虫感染的Prima2000的根中保持的卵和J2，卵质量和'ELF的数量明显高于抗性LS5995（Pi = 100时），在两个实验中均更高。两个品种的Rf值均与Pi成反比，在LS5995上最低，而Prima2000在两个实验中均保持明显较高的Rf值。 LS5995的良率损失至少是Prima2（）00的六倍。尽管有人建议寄主植物对植物寄生线虫的抗性可能不足以作为高侵染土壤或包括线虫易感作物的轮作系统中唯一的管理工具，但货币条件上的差异得到了证明。

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