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Anti-Insect Activity Of A Partially Purified Protein Derived From The Entomopathogenic Fungus Lecanicillium Lecanii (Zimmermann) And Its Putative Role In A Tomato Defense Mechanism Against Green Peach Aphid

文献类型： 外文期刊

作者： Hanan, A; Basit, A; Nazir, T; Majeed, MZ; Qiu, DW

作者机构：

关键词： Lecanicillium Lecanii; Myzus Persicae; Induced Resistance; Jasmonic Acid Pathway; Salicylic Acid Pathway; Gene Expression

期刊名称： JOURNAL OF INVERTEBRATE PATHOLOGY

ISSN： 0022-2011

年卷期： 2020 年 170 卷

页码：

收录情况： JCR（2021版）

摘要： Many biotrophic and necrotrophic fungi synthesize proteins that may elicit induced plant resistance against different herbivore pests. This in-vitro study elucidates the sub-lethal effect of a partially-purified protein derived from the entomopathogenic fungus Lecanicillium lecanii (Zimmerman) (Hypocreales: Clavicipitaceae) against green peach aphid Myzus persicae (Sulzer) (Hemiptera: Aphididae), an economically important pest of many solanaceous crops including tomato. Bioassays were conducted to determine the impact of different concentrations of protein (ie. 0.018, 0.036 and 0.054 mu M) on the survival and fecundity of M. persicae on tomato (Lycopersicon esculentum) plants. Moreover, the potential role of this exogenous protein in the plant defense mechanism was assessed by expression analyses of key genes associated with salicylic acid (SA) and jasmonic acid (JA) pathways using RT-qPCR. The results indicated a significant negative effect of all protein concentrations on the survivorship and fecundity of M. persicae. The highest concentration (0.054 mu M) resulted in lowest survival (46%) of aphids at 7th day post-treatment, while two other concentrations (0.036 and 0.018 mu M) resulted in 61 and 71% survival rate, respectively. Similarly, lowest and highest mean fecundity rates were recorded for the highest protein concentration and the control (1.5 and 2.4 nymphs day(-1) female(-1)), respectively. Moreover, L. lecanii-derived protein strongly upregulated the SA associated genes PR1, BGL2 and PAL, and moderately upregulated the JA associated genes LOX, AOS and AOC in protein-treated tomato plants compared to the control plants. These findings demonstrate the systemic resistance induced in tomato plants against M. persicae by the exogenous application of partially-purified protein extracted from L. lecanii, suggesting its further purification and characterization as a novel biological pest management tool against aphids and other phloem-feeding insect pests.

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