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Environ Pollut

Title:		Toxic mechanism of two cyanobacterial volatiles beta-cyclocitral and beta-ionone on the photosynthesis in duckweed by altering gene expression
Author(s):		Du S; Xu H; Yang M; Pan N; Zheng T; Xu C; Li Y; Zuo Z;
Address:		"State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Hangzhou, 311300, China; Zhejiang Provincial Key Laboratory of Forest Aromatic Plants-based Healthcare Functions, Zhejiang A&F University, Hangzhou, 311300, China. State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Hangzhou, 311300, China. State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Hangzhou, 311300, China; Zhejiang Provincial Key Laboratory of Forest Aromatic Plants-based Healthcare Functions, Zhejiang A&F University, Hangzhou, 311300, China. Electronic address: zuozhaojiang@126.com"
Journal Title:		Environ Pollut
Year:		2022
Volume:		20220706
Issue:
Page Number:		119711 -
DOI:		10.1016/j.envpol.2022.119711
ISSN/ISBN:		1873-6424 (Electronic) 0269-7491 (Linking)
Abstract:		"Volatile organic compounds (VOCs) promote cyanobacteria dominating eutrophicated waters, with aquatic plant decrease and even disappearance. To uncover the toxic mechanism of cyanobacterial VOCs on aquatic plants, we investigated the growth, photosynthetic pigment levels, photosynthetic abilities and related gene expression in duckweed treated with beta-cyclocitral and beta-ionone, 2 main components in the VOCs. The levels of chlorophylls and carotenoids gradually declined with raising the concentration of the 2 compounds and prolonging the treatment time. Their decline should result from the down-regulation of 8 genes associated with photosynthetic pigment biosynthesis and up-regulation of 2 genes involved in carotenoid degradation. The reduction was also found in the photosystem II (PSII) efficiency and O(2) evolution rate, which should result from the lowered photosynthetic pigment levels and down-regulation of 38 genes related with photosynthetic process. The frond numbers, total frond area and fresh weight gradually decreased with raising the 2 compound concentration, which may result from the lowered photosynthetic abilities as well as down-regulated expression of 7 genes associated with growth-promoting hormone biosynthesis and signal transduction. It can be speculated that cyanobacterial VOCs may poison aquatic plants by lowering the photosynthesis and growth through altering related gene expression"
Keywords:		Aldehydes *Araceae/genetics *Cyanobacteria/genetics/metabolism Diterpenes Gene Expression Norisoprenoids Photosynthesis *Volatile Organic Compounds/metabolism/toxicity Photosynthetic ability Toxic mechanism beta-Cyclocitral beta-Ionone;
Notes:		"MedlineDu, Siyi Xu, Haozhe Yang, Mengdan Pan, Ning Zheng, Tiefeng Xu, Chenyi Li, Yan Zuo, Zhaojiang eng England 2022/07/10 Environ Pollut. 2022 Sep 1; 308:119711. doi: 10.1016/j.envpol.2022.119711. Epub 2022 Jul 6"