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PATHOGENICITY OF MELOIDOGYNE HAPLA ON ONION

机译：洋葱蛋黄素的致病性

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Pang, W., S. L. Hafez, and P. Sundararaj. 2009. Pathogenicity of Meloidogyne hapla on onion. Nematropica 39:225-233. Meloidogyne hapla and M. incognita can both cause severe damage in onion production. Thus the objective of this study was to examine the relationship between different initial densities of M. hapla and the subsequent yield loss of onion. 'Tioga' onion seedlings were inoculated with M. hapla at 0, 3,000, 6,000, 9,000, or 12,000 J2/1500 cm3 pot in the greenhouse and 0, 40,000, 80,000, 160,000 M. hapla or 80,000 M. incognita J2/20,000 cm3 plot in the field microplot experiment. Data was collected on fresh and dry weights of the shoot, root and whole plant, bulb diameter and weight, and nematode populations in the roots and soil were collected at harvest. Onion weight was reduced with the increasing inoculum levels of M. hapla, and significant reduction began at 3,000 M. hapla J2/pot or 40,000 M. hapla J2/microplot. Root dry weight reduction ranged from 30.2% to 48.2%, with a total plant dry weight reduction of 40.6% to 59.6% in greenhouse tests. In field microplots, the maximum reduction in bulb fresh weight was 41.3% at 160,000 M. hapla J2/microplot and significantly more damage was caused by M. hapla than M. incognita at the same rate of 80,000 J2/microplot. Linear regressions indicated that for an increase of 40,000 in the initial inoculum density of M. hapla J2, there was a reduction of 0.4 cm in bulb diameter and 12 gram in bulb weight. The damage caused by M. incognita at 80,000 J2/microplot was not different from that caused by M. hapla at 40,000 J2/plot.
机译：Pang，W.，S. L. Hafez和P.Sundararaj。 2009.洋葱Meloidogyne hapla的致病性。 Nematropica 39：225-233。根结线虫和隐杆线虫都可能对洋葱生产造成严重损害。因此，本研究的目的是检验不同的初始M. hapla密度与洋葱随后的产量损失之间的关系。在温室中分别以0、3,000、6,000、9,000或12,000 J2 / 1500 cm3的盆栽哈巴分支杆菌（M. hapla）和0，40,000、80,000、160,000 M. hapla或80,000 M隐身J2 / 20,000 cm3接种'Tioga'洋葱苗在现场进行微图实验。收集有关茎的鲜重和干重，根和整株重量，鳞茎直径和重量的数据，并在收获时收集根和土壤中的线虫种群。随着接种量的增加，洋葱的重量降低了M. hapla，并且在3,000 M. hapla J2 / pot或40,000 M. hapla J2 / microplot开始显着减少。在温室试验中，根的干重减少幅度为30.2％至48.2％，总的植物干重减少幅度为40.6％至59.6％。在田间微标本中，在160,000 M. hapla J2 / microplot上，球茎鲜重的最大减少为41.3％，并且在相同的80,000 J2 / microplot下，由M. hapla造成的伤害明显大于隐身M.。线性回归表明，对于增加的M. hapla J2初始接种密度40,000，球直径减小0.4厘米，球重量减小12克。在80,000 J2 /图上，由隐杆线虫造成的损害与在40,000 J2 /图上，由hapla支原体造成的损害没有区别。

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