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首页> 外文期刊>Nematropica >Population dynamics of MELOIDOGYNE INCOGNITA and infestation levels by PASTEURIA PENETRANS in a naturally infested field in Martinique
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Population dynamics of MELOIDOGYNE INCOGNITA and infestation levels by PASTEURIA PENETRANS in a naturally infested field in Martinique

机译：马提尼克岛自然侵染田间鲑鱼的种群动态和PASTEURIA PENETRANS的侵染水平

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The population dynamics of Meloidogyne incognita juveniles (J2) in association with the parasite Pasteuria penetrans was studied in a field in Martinique. Data obtained at three-week intervals for one year were analyzed to study the relationship between J2 density and endospore infestation levels. Six crop sequences were evaluated in five replicates. They were: resistant tomato, okra, fallow, cabbage; susceptible tomato, okra, fallow, cabbage; bean, pepper, fallow, cabbage; eggplant, fallow; cucumber, velvetbean, fallow, cabbage; fallow, pepper, cabbage, fallow, cabbage. The J2 densities showed fluctuating trends, frequently synchronous with fluctuations of endospore infestation. The highest J2 numbers observed ranged between 1 000 and 1 500 nematodes/100 g of soil in the first four crop sequences, and between 150 and 250 J2/100 g of soil in the last two. The highest percentages of nematodes with adhering endospores ranged between 50 and 70%. The resistant tomato crop showed a sharp decrease in the nematode density at the end of the crop sequence, with a similar synchronous decrease of the endospore infestation. This trend was also observed during the fallow periods in the other treatments. Susceptible crops allowed a sharp increase of the J2 densities. During these periods of population growth, the concomitant increase of the endospore infestation levels was interrupted with fast growing J2 densities. In the last two crop sequences, the J2 densities progressively decreased because of the on-host status of velvetbean and of a longer fallow, respectively. When all the pooled data from the six treatments were considered, a significant linear correlation was observed between J2 densities and the corresponding endospore infestation values (P 0.001). This relationship appeared related to the density of females releasing J2 and/or endospores in the soil. All pooled mean densities also followed the Gutenberg-Richter power law distribution, indicating the oc-currence of chaotic effects influencing their dynamics. Although chaos implies non-predictability of J2 numbers and endospore infestation dynamics, it also suggests that large-scale fluctuations may induce local nematode suppression by P. penetrans.
机译：在马提尼克岛的一个田野中研究了隐线夜蛾幼虫（J2）与寄生虫巴斯德氏杆菌的种群动态。分析以一年三周的间隔获得的数据，以研究J2密度与孢子侵染水平之间的关系。六次重复评估了六个农作物序列。它们是：抗性番茄，秋葵，休闲食品，白菜;易感番茄，秋葵，休闲，白菜;豆，胡椒，休闲食品，白菜;茄子，休闲黄瓜，丝绒豆，休闲食品，白菜;休闲，胡椒，白菜，休闲，白菜。 J2密度显示出波动的趋势，经常与内生孢子侵扰的波动同步。在前四个农作物序列中，观测到的最高J2值介于1000至1500线虫/ 100 g土壤之间，在后两个作物序列中，最高J2值介于150至250 J2 / 100 g土壤之间。带有内生孢子的线虫的最高百分比在50％到70％之间。抗性番茄作物的线虫密度在作物序列结束时急剧下降，与此同时，内生孢子的侵害也有所下降。在其他治疗的休假期也观察到了这种趋势。易感作物使J2密度急剧增加。在这些人口增长时期，随着J2密度的快速增长，内生孢子侵扰水平的随之增加被中断。在最后两个农作物序列中，J2密度分别由于天鹅绒豆和较长休耕期的寄主状态而逐渐降低。当考虑所有来自六个处理的汇总数据时，在J2密度和相应的内生孢子侵染值之间观察到显着的线性相关性（P 0.001）。这种关系似乎与雌性在土壤中释放J2和/或内生孢子的密度有关。所有合并的平均密度也遵循古腾堡-里希特幂定律分布，表明发生了影响其动力学的混沌效应。尽管混乱暗示了J2数量和内生孢子侵染动力学的不可预测性，但它也表明大规模的波动可能会导致P.penetrans抑制局部线虫。

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