Shen Shicai, Ma Guangzong, Xu Gaofeng, Li Diyu, Jin Guimei, Yang Shaosong, Clements David Roy, Chen Aidong, Wen Lina, Zhang Fudou, Ye Min
Key Laboratory of Prevention and Control of Biological Invasions, Ministry of Agriculture and Rural Affairs of China, Agricultural Environment and Resource Research Institute, Yunnan Academy of Agricultural Sciences, Kunming, China.
Key Laboratory of Green Prevention and Control of Agricultural Transboundary Pests of Yunnan Province, Agricultural Environment and Resource Research Institute, Yunnan Academy of Agricultural Sciences, Kunming, China.
Front Plant Sci. 2022 Apr 12;13:823947. doi: 10.3389/fpls.2022.823947. eCollection 2022.
Sweet potato [ (L.) Lam] is grown as important cash and food crop worldwide and has been shown to exhibit allelopathic effects on other plants. However, its metabolome has not been studied extensively, particularly with respect to the production of phytotoxic bioactive secondary products. In this study, the chemical composition of petroleum ether extract of sweet potato was characterized, and the morphological and physiological effects of some individual components against four invasive alien weeds L., Cav., Lam., and Retz. were determined. Twenty-one components were identified by GS-MS, constituting 96.08% of petroleum ether extract in sweet potato. The major components were palmitic acid (PA) (17.48%), ethyl linoleate (EL) (13.19%), linoleic acid (LA) (12.55%), ethyl palmitate (EP) (11.77%), ethyl linolenate (ELL) (8.29%) oleic acid (5.82%), ethyl stearate (4.19%), and 3-methylphenol acetate (3.19%). The five most abundant compounds exhibited strong inhibition activity against the four invasive weeds tested. The highest inhibition rates were seen for LA, followed by PA and EP, respectively. Catalase (CAT), malondialdehyde (MDA), and peroxidase (POD) content of were increased by the three allelochemicals, i.e., LA, PA and EP, but superoxide dismutase (SOD), chlorophyll-a and chlorophyll-b levels declined. Overall, the combined impact of all five compounds could be quite effective in suppressing the invasive weeds of concern.
甘薯[（L.）Lam]是全球重要的经济作物和粮食作物，已被证明对其他植物具有化感作用。然而，其代谢组尚未得到广泛研究，特别是关于植物毒性生物活性次生产物的产生。在本研究中，对甘薯石油醚提取物的化学成分进行了表征，并测定了一些单个成分对四种外来入侵杂草L.、Cav.、Lam.和Retz.的形态和生理影响。通过气相色谱-质谱联用（GS-MS）鉴定出21种成分，占甘薯石油醚提取物的96.08%。主要成分是棕榈酸（PA）（17.48%）、亚油酸乙酯（EL）（13.19%）、亚油酸（LA）（12.55%）、棕榈酸乙酯（EP）（11.77%）、亚麻酸乙酯（ELL）（8.29%）、油酸（5.82%）、硬脂酸乙酯（4.19%）和3-甲基苯酚乙酸酯（3.19%）。这五种含量最高的化合物对所测试的四种入侵杂草表现出强烈的抑制活性。抑制率最高的是LA，其次是PA和EP。三种化感物质，即LA、PA和EP，使杂草的过氧化氢酶（CAT）、丙二醛（MDA）和过氧化物酶（POD）含量增加，但超氧化物歧化酶（SOD）、叶绿素a和叶绿素b水平下降。总体而言，所有五种化合物的综合影响可能对抑制相关入侵杂草非常有效。
