稻蚜种群密度相关的建立与繁殖

IF 1.3 4区 农林科学 Q2 ENTOMOLOGY
Shigeru Hoshino, Katsumi Togashi
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引用次数: 0

摘要

白翅线虫(线虫纲:白翅线虫科)是一种由水稻种子传播的外寄生虫,可引起“白尖”病。当种子浸泡在水中时,线虫从种子中出来,通过在淹水的稻田中游动到达水稻植株,并在其上繁殖。进行了两个单独的实验,以确定水中线虫丰度与线虫的到达(感染)和随后的繁殖、疾病发病率和稻米产量之间的关系。实验1表明,随着幼苗周围贝塞伊种群(Pi)的增加,植株的发病率和单株收获的所有种子的线虫数(Pf)均增加,但线虫种群(Pf/Pi)的增长率下降。尽管很难从植物中分离出所有到达的线虫(实验2 - 5),但Pi水平与线虫到达的估计概率之间存在负相关关系。然而,抵达的人数估计会随着Pi的水平而增加。从这些结果可以认为,线虫生长速率(Pf/Pi)的密度依赖性下降在很大程度上取决于线虫在植物上建立(定植)和/或建立后繁殖速率的密度依赖性降低。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Density-related establishment and reproduction of Aphelenchoides besseyi (Nematoda: Aphelenchoididae) populations on Oryza sativa

Aphelenchoides besseyi Christie (Nematoda: Aphelenchoididae) is a seed-borne ectoparasite of Oryza sativa rice and causes ‘white tip’ disease. When seeds are soaked in water, the nematodes emerge from them, arrive at rice plants by swimming in flooded paddy fields, and reproduce on them. Two separate experiments were conducted to determine the relationships of the nematode abundance in water to the arrival (infection) and subsequent multiplication of nematodes, the disease incidence, and the yield of rice grains. Experiment 1 showed that, as the A. besseyi population (Pi) surrounding the seedlings increased, both the disease incidence of plants and the number of nematodes (Pf) in all seeds harvested per plant increased, but the rate of increase in the nematode population (Pf/Pi) decreased. Negative relationships were found between the Pi level and the estimated probability of nematode arrival, although it was extremely difficult to isolate all arrivals from plants (experiments 2 − 5). However, the number of arrivals was estimated to increase with the Pi level. It is considered from these results that the density-dependent decrease in the rate of increase (Pf/Pi) was determined largely by the density-dependent reduction in the rates of nematode establishment (colonization) and/or post-establishment reproduction on plants.

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来源期刊
CiteScore
2.70
自引率
7.70%
发文量
37
审稿时长
6-12 weeks
期刊介绍: Applied Entomology and Zoology publishes articles concerned with applied entomology, applied zoology, agricultural chemicals and pest control in English. Contributions of a basic and fundamental nature may be accepted at the discretion of the Editor. Manuscripts of original research papers, technical notes and reviews are accepted for consideration. No manuscript that has been published elsewhere will be accepted for publication.
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