Inhibitory effects of Ipomoea cairica extracts on the harmful algae Phaeocystis globosa. (December 2022)

• Record Type: Journal Article
• Authors: Liang, Dayong; Xiang, Hua; Xia, Jianrong
• Is Part Of: Marine pollution bulletin. Volume 185:Part A(2022)
• Publication Date: 2022-12
• Subjects: Ipomoea cairica -- Phaeocystis globosa -- Algaecide -- Photosynthesis -- Reactive oxygen species; Marine pollution -- Periodicals; Marine Biology -- Periodicals; Water Pollution -- Periodicals; Mer -- Pollution -- Périodiques; Publications périodiques; Pollution des mers; Lutte antipollution; Electronic journals; 363.7394
• DOI: 10.1016/j.marpolbul.2022.114228
• Languages: English
• ISSNs: 0025-326X

Abstract

Abstract: Ipomoea cairica (L.) Sweet is an invasive plant that cause serious invasion and damage in South China. Phaeocystis globosa is a common harmful algal bloom species on the southeast coast of China. Both species cause great environmental disturbances and serious economic damage to the localregion. This study explored the potential inhibitory effects of I. cairica leaf extracts on P. globosa . The results showed that solitary cells growth was inhibited at extract concentrations higher than 0.25 % (v/v). Although the colony diameter did not change, and the colony number increased rapidly in the first 36 h, we found that cells in the colonies had been damaged using scanning electron microscope and SYTOX-Green staining at 48 h. In addition, the rapid light-response curve of cells treated with extracts decreased, along with down-regulation of photosynthesis-related genes ( psbA, psbD, and rbcL ), suggesting damage to the photosynthetic system. Finally, the activities of antioxidant enzymes including superoxide dismutase, peroxidase, and catalase increased with increasing treatment time, indicating that cells activate antioxidant enzyme defense systems to alleviate the production of reactive oxygen species (ROS). Increased ROS levels disrupt cell membranes, alter cellular ultrastructures, and ultimately lead to cell death. This study not only achieved the reuse of invasive plant resources, but also demonstrated that I. cairica leaf extract has potential value as an algaecide. Highlights: I. cairica extract effectively inhibited the growth of solitary cells and colonies. I. cairica extract inhibited photosynthesis and the expression of related genes Elevated ROS levels cause disrupt cell membranes, alter cell surface ultrastructure, and ultimately lead to cell death.