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来自L.叶中富含倍半萜内酯的馏分对芽前和芽后杂草物种的植物毒性活性及推定作用模式

Phytotoxic Activity of Sesquiterpene Lactones-Enriched Fractions from L. Leaves on Pre-Emergent and Post-Emergent Weed Species and Putative Mode of Action.

作者信息

Rosa Daniela, Rial Carlos, Brás Teresa, Varela Rosa M, Macías Francisco A, Duarte Maria F

机构信息

Alentejo Biotechnology Center for Agriculture and Agro-Food (CEBAL)/Polytechnic Institute of Beja (IPBeja), 7801-908 Beja, Portugal.

MED-Mediterranean Institute for Agriculture, Environment and Development & CHANGE-Global Change and Sustainability Institute, Alentejo Biotechnology Center for Agriculture and Agro-Food (CEBAL), 7801-908 Beja, Portugal.

出版信息

Plants (Basel). 2024 Oct 1;13(19):2758. doi: 10.3390/plants13192758.

DOI:10.3390/plants13192758
PMID:39409628
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11478626/
Abstract

Sesquiterpene lactones (SLs) are compounds that are highly produced in leaves, known for their phytotoxic activity. This study aims to assess SL-enriched fractions' (cynaropicrin, aguerin B, and grosheimin) phytotoxic potentials and putative modes of action, compared to an initial extract, using two approaches: first, against a panel of nine weed species in pre-emergence, and then on L.'s post-emergency stage. The SL-enriched fractions demonstrated greater phytotoxic activity when compared with the leaf initial extract. The SL-enriched fractions had higher activity at root growth inhibition over the panel tested, doubling the activity in five of them at 800 ppm. Regarding the post-emergence bioassay, the SL-enriched fractions had a higher influence on the plants' growth inhibition (67% at 800 ppm). The SL-effects on the plants' metabolisms were evidenced. The total chlorophyll content was reduced by 65% at 800 ppm. Oxidative stress induction was observed because of the enhancement in MDA levels at 800 ppm compared to control (52%) and the decrease in SOD-specific activity from 4.20 U/mg protein (400 ppm) to 1.74 U/mg protein (800 ppm). The phytotoxic effects of the SL-enriched fractions suggest that they could be used for a future bioherbicide development.

摘要

倍半萜内酯（SLs）是在叶片中大量产生的化合物，以其植物毒性活性而闻名。本研究旨在通过两种方法评估富含SL的组分（洋蓟苦素、阿盖林B和格罗舍明）与初始提取物相比的植物毒性潜力和推定作用模式：第一，针对一组九种杂草在出苗前进行测试，然后在番茄出苗后阶段进行测试。与叶片初始提取物相比，富含SL的组分表现出更大的植物毒性活性。在测试的一组中，富含SL的组分对根生长抑制具有更高的活性，在800 ppm时其中五种的活性增加了一倍。关于出苗后生物测定，富含SL的组分对植物生长抑制的影响更大（800 ppm时为67%）。证明了SL对植物代谢的影响。在800 ppm时，总叶绿素含量降低了65%。观察到氧化应激诱导，因为与对照相比，800 ppm时丙二醛水平升高（52%），超氧化物歧化酶比活性从4.20 U/mg蛋白质（400 ppm）降至1.74 U/mg蛋白质（800 ppm）。富含SL的组分的植物毒性作用表明它们可用于未来生物除草剂的开发。

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