Shumaila Rasool , Birgit Jensen , Thomas G. Roitsch , Nicolai V. Meyling
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引用次数: 0
摘要
用昆虫病原真菌（EPF）进行种子接种会产生植物介导的抗节肢动物食草动物效应，但不同的 EPF 分离物所产生的反应各不相同。我们使用了一个小麦模型系统，其中的三种分离物分别代表 Beauveria bassiana 和 Metarhizium spp.，它们对蚜虫 Rhopalosiphum padi 产生了负面或正面的影响。接种 EPF 后，植物体内六种碳水化合物酶的活性增加，显示生物量增加。然而，只有醛缩酶活性与 R. padi 的数量呈正相关。接种了罗伯茨酵母菌的植株蚜虫数量最少，超氧化物歧化酶的活性也有所提高，这意味着它们采取了抵抗食草动物的防御策略。在接种了 M. brunneum 的植株中，寄主 R. padi 最多，过氧化氢酶和谷胱甘肽还原酶的活性增加，表明对蚜虫的解毒反应增强。不过，M. brunneum 同时也提高了植物的生长，表明这种分离物可能会使植物耐受草食性。因此，EPF 种子接种剂可能以依赖分离物的方式介导植物对生物胁迫的耐受性或抵抗性。
Enzyme regulation patterns in fungal inoculated wheat may reflect resistance and tolerance towards an insect herbivore
Seed inoculation with entomopathogenic fungi (EPF) causes plant-mediated effects against arthropod herbivores, but the responses vary among EPF isolates. We used a wheat model system with three isolates representing Beauveria bassiana and Metarhizium spp. causing either negative or positive effects against the aphid Rhopalosiphum padi. Activities of six carbohydrate enzymes increased in plants showing biomass build-up after EPF inoculations. However, only aldolase activity showed positive correlation with R. padi numbers. Plants inoculated with M. robertsii hosted fewest aphids and showed increased activity of superoxide dismutase, implying a defense strategy of resistance towards herbivores. In M. brunneum-inoculated plants, hosting most R. padi, activities of catalase and glutathione reductase were increased suggesting enhanced detoxification responses towards aphids. However, M. brunneum simultaneously increased plant growth indicating that this isolate may cause the plant to tolerate herbivory. EPF seed inoculants may therefore mediate either tolerance or resistance towards biotic stress in plants in an isolate-dependent manner.
期刊介绍：
The Journal of Plant Physiology is a broad-spectrum journal that welcomes high-quality submissions in all major areas of plant physiology, including plant biochemistry, functional biotechnology, computational and synthetic plant biology, growth and development, photosynthesis and respiration, transport and translocation, plant-microbe interactions, biotic and abiotic stress. Studies are welcome at all levels of integration ranging from molecules and cells to organisms and their environments and are expected to use state-of-the-art methodologies. Pure gene expression studies are not within the focus of our journal. To be considered for publication, papers must significantly contribute to the mechanistic understanding of physiological processes, and not be merely descriptive, or confirmatory of previous results. We encourage the submission of papers that explore the physiology of non-model as well as accepted model species and those that bridge basic and applied research. For instance, studies on agricultural plants that show new physiological mechanisms to improve agricultural efficiency are welcome. Studies performed under uncontrolled situations (e.g. field conditions) not providing mechanistic insight will not be considered for publication.
The Journal of Plant Physiology publishes several types of articles: Original Research Articles, Reviews, Perspectives Articles, and Short Communications. Reviews and Perspectives will be solicited by the Editors; unsolicited reviews are also welcome but only from authors with a strong track record in the field of the review. Original research papers comprise the majority of published contributions.
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