Abstract

Ophiobolin A is a secondary phytotoxic metabolite produced by some pathogenic fungal species responsible for severe plant diseases, considered to play a role in disease development and symptom appearance. Herein we investigated whether the phytotoxic activities of ophiobolin A against weed species could be improved by nanoencapsulation. Given the rapid natural degradation of the compound, it was hoped that nanoencapsulation would prolong the phytotoxic effects or enhance the bioactivity, thus leading to improved weed control capabilities. This article presents an assessment of the effectiveness of encapsulated ophiobolin A on 11 commonly found weed species, compared to the pure ophiobolin, to the particle alone, and a combination of mixed particles and ophiobolin A, by applying the solution droplets to both intact or injured leaf surface, on the adaxial or abaxial side. The bioassays showed the improved efficacy of the encapsulated ophiobolin, and the need for leaf lesions to diffuse the particles into the tissues.

摘要

Ophiobolin A 是由一些引起严重植物病害的病原真菌产生的次生植物毒性代谢物，被认为在疾病发展和症状出现中起作用。在此，我们研究了蛇毒蛋白 A 对杂草的植物毒性活性是否可以通过纳米封装得到改善。鉴于该化合物的快速自然降解，希望纳米包封能够延长植物毒性作用或增强生物活性，从而提高杂草控制能力。本文通过将溶液液滴应用于完整或受伤的溶液液滴，评估了封装的蛇麻毒素 A 对 11 种常见杂草的有效性，与纯蛇麻毒素、单独颗粒以及混合颗粒和蛇麻毒素 A 的组合相比叶面，在正面或背面。生物测定显示封装的蛇毒蛋白的功效提高，并且需要叶片损伤以将颗粒扩散到组织中。