Resting spore formation of aphid-pathogenic fungus Pandora nouryi depends on the concentration of infective inoculum.

Resting spore formation of aphid-pathogenic fungus Pandora nouryi depends on the concentration of infective inoculum.
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蚜虫病原真菌 Pandora nouryi 的静息孢子形成取决于感染接种物的浓度。

DOI:
10.1111/j.1462-2920.2008.01577.x
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发表时间:
2008-07
影响因子:
5.1
通讯作者:
--
中科院分区:
生物学2区
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--
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一些蚜虫病原性虫霉菌目的休眠孢子形成对其流行和生存的季节性模式很重要,但人们对这一过程知之甚少。为了探讨这一过程的可能机制,在适宜条件下,诺氏潘多拉(Pandora nouryi)绿色(Myzus persicae)在甘蓝叶片上相互作用。从中国低纬度高原空气中捕获的一个分离物的初生分生孢子(LC(50):0.9-6.7分生孢子mm(-2),4-7天后)淋洒寄主,产生休眠孢子(azygospores)、初生分生孢子或两种孢子类型。令人惊讶的是,在28-240分生孢子mm(-2)的浓度(C)内,形成休眠孢子的真菌化尸体的比例(P(CFRS))急剧增加,在240-1760保持高水平,但在0.3-16为零或极低。P(CFRS)-C关系符合Logistic方程P(CFRS)= 0.6774/[1 + exp(3.1229-0.0270C)](r(2)= 0.975)。这首次阐明了诺氏疟原虫体内休眠孢子形成对感染性接种物浓度的依赖性。因此,提出了一个假说,即在宿主-病原体相互作用中可能存在某种生化信号,使得真菌病原体通过产生用于感染可用宿主的分生孢子或形成用于原位存活宿主缺失的休眠孢子来感知对即将到来的宿主密度变化的迅速反应的信号。
Resting spore formation of some aphid-pathogenic Entomophthorales is important for the seasonal pattern of their prevalence and survival but this process is poorly understood. To explore the possible mechanism involved in the process, Pandora nouryi (obligate aphid pathogen) interacted with green peach aphid Myzus persicae on cabbage leaves under favourable conditions. Host nymphs showered with primary conidia of an isolate (LC(50): 0.9-6.7 conidia mm(-2) 4-7 days post shower) from air captures in the low-latitude plateau of China produced resting spores (azygospores), primary conidia or both spore types. Surprisingly, the proportion of mycosed cadavers forming resting spores (P(CFRS)) increased sharply within the concentrations (C) of 28-240 conidia mm(-2), retained high levels at 240-1760, but was zero or extremely low at 0.3-16. The P(CFRS)-C relationship fit well the logistic equation P(CFRS) = 0.6774/[1 + exp(3.1229-0.0270C)] (r(2) = 0.975). This clarified for the first time the dependence of in vivo resting spore formation of P. nouryi upon the concentration of infective inoculum. A hypothesis is thus proposed that some sort of biochemical signals may exist in the host-pathogen interaction so that the fungal pathogen perceives the signals for prompt response to forthcoming host-density changes by either producing conidia for infecting available hosts or forming resting spores for surviving host absence in situ.
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