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首页> 外文期刊>Plant Pathology >Biological control agents (ESCAs) of verticillium wilt: influence of application rates and delivery method on plant protection, triggering of host defence mechanisms and rhizosphere populations of BCAs
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Biological control agents (ESCAs) of verticillium wilt: influence of application rates and delivery method on plant protection, triggering of host defence mechanisms and rhizosphere populations of BCAs

机译：黄萎病的生物防治剂（ESCA）：施用量和施用方式对植物保护，BCAs宿主防御机制和根际种群触发的影响

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摘要

Verticillium dahliae causes severe yield reductions in a variety of important annual crops worldwide. Control of verticillium wilt has relied on soil fumigation; however, the use of the main soil fumigant, methyl bromide, has been banned in the European Union since 2010, creating a demand for novel crop protectants. As such, the use of biocontrol agents (BCAs) is an appealing management strategy. Prerequisites for the development of a successful BCA are an understanding of the modes of action of the antagonist, its ecological fitness and an efficient and economically feasible delivery system. Therefore, two BCAs (Paenibacillus alvei K165 or the nonpathogenic Fusarium oxysporum F2) and two release strategies (seed coating or amendment of the transplant soil plug) were assessed against verticillium wilt of aubergine (eggplant). Mixing the transplant soil plug with K165 or F2, at a rate of 10 and 20% (v/v), respectively, reduced verticillium wilt symptom development. Furthermore, a positive correlation was revealed between the release strategy and the BCA rhizosphere population. Correlation analysis also showed that disease severity was negatively correlated to the rhizosphere size of the BCA population. In addition, qPCR analysis showed that both BCAs induced the expression of the pathogenesis-related (PR) proteins PR1 and PR4 in the stem of aubergines before and after inoculation with V. dahliae in a manner that suggests a link with the rhizosphere size of the BCA population.
机译：黄萎病菌导致全世界各种重要的一年生作物的单产严重下降。控制黄萎病依赖于土壤熏蒸。但是，自2010年以来，欧盟已禁止使用主要的土壤熏蒸剂甲基溴，这引发了对新型农作物保护剂的需求。因此，使用生物防治剂（BCA）是一种有吸引力的管理策略。成功开发BCA的前提条件是了解拮抗剂的作用方式，其生态适应性以及有效且经济可行的输送系统。因此，针对茄子的黄萎病（茄子），评估了两种BCA（肺炎克氏杆菌K165或非致病性尖孢镰刀菌F2）和两种释放策略（种子包衣或改良移植土壤塞）。分别以10％和20％（v / v）的比例将移植土壤塞与K165或F2混合，可减少黄萎病症状的发展。此外，释放策略与BCA根际种群之间存在正相关。相关分析还显示，疾病严重程度与BCA种群的根际大小负相关。此外，qPCR分析表明，两种BCA均在接种大黄弧菌之前和之后均诱导了茄子茎中病程相关（PR）蛋白PR1和PR4的表达，这暗示了其与根际的大小有关。 BCA人口。

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