Chlormequat inhibits Vallisneria natans growth and shapes the epiphytic biofilm microbial community.

IF 2.5 4区 环境科学与生态学 Q3 ENGINEERING, ENVIRONMENTAL Water Environment Research Pub Date : 2024-10-01 DOI:10.1002/wer.11148
Zihang Ma, Dan Ai, Zuhan Ge, Tao Wu, Jibiao Zhang
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Abstract

Submerged macrophytes can overgrow and negatively affect freshwater ecosystems. This study aimed to investigate the use of chlormequat (CQ) to regulate submerged Vallisneria natans growth as well as its impact on the microbial community of epiphytic biofilms. V. natans height under CQ dosages of 20, 100, and 200 mg/L decreased within 21 days by 12.57%, 30.07%, and 44.62%, respectively, while chlorophyll content increased by 1.94%, 20.39%, and 38.83%. At 100 mg/L, CQ reduced the diversity of bacteria in the biofilm attached to V. natans leaves but increased the diversity of the eukaryotic microbial community. CQ strongly inhibited Cyanobacteria; compared with the control group, the treatment group experienced a significant reduction from 36.54% to 2.61%. Treatment significantly inhibited Gastrotricha and Rotifera, two dominant phyla of eukaryotes in the leaf biofilm, reducing their relative abundances by 17.41% and 6.48%, respectively. CQ significantly changed the leaf biofilm microbial community correlation network. The treatment group exhibited lower modularity (2.012) compared with the control group (2.249); however, the central network of the treated group contained a higher number of microbial genera (13) than the control group (4), highlighting the significance of eukaryotic genera in the network. The results obtained from this study provide invaluable scientific context and technical understanding pertinent to the restoration of submerged macrophytes within aquatic ecosystems. PRACTITIONER POINTS: Chlormequat reduced the plant height but increased leaf chlorophyll content. Chlormequat reduced biofilm bacterial diversity but increased eukaryotic diversity. Chlormequat affected the bacterial-fungal association networks in biofilms.

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矮壮素能抑制 Vallisneria natans 的生长并形成附生生物膜微生物群落。
沉水大型藻类会过度生长并对淡水生态系统产生负面影响。本研究旨在调查使用矮壮素(CQ)调节沉水大叶女贞(Vallisneria natans)生长及其对附生生物膜微生物群落的影响。在 CQ 剂量为 20、100 和 200 mg/L 的条件下,V. natans 的高度在 21 天内分别下降了 12.57%、30.07% 和 44.62%,而叶绿素含量则分别增加了 1.94%、20.39% 和 38.83%。在 100 毫克/升的浓度下,CQ 会降低附着在 V. natans 叶片上的生物膜中细菌的多样性,但会增加真核微生物群落的多样性。CQ 对蓝藻有很强的抑制作用;与对照组相比,处理组的抑制率从 36.54% 显著下降到 2.61%。处理组明显抑制了叶片生物膜中的两个主要真核微生物门--胃孢子虫和轮虫,它们的相对丰度分别降低了 17.41% 和 6.48%。CQ 明显改变了叶片生物膜微生物群落相关网络。与对照组(2.249)相比,处理组的模块化程度(2.012)较低;然而,处理组的中心网络包含的微生物属数量(13 个)高于对照组(4 个),凸显了真核生物属在网络中的重要性。这项研究的结果为恢复水生生态系统中的沉水大型藻类提供了宝贵的科学背景和技术理解。实践点:矮壮素降低了植物高度,但增加了叶片叶绿素含量。百草枯降低了生物膜细菌的多样性,但增加了真核生物的多样性。毒死蜱会影响生物膜中的细菌-真菌关联网络。
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来源期刊
Water Environment Research
Water Environment Research 环境科学-工程:环境
CiteScore
6.30
自引率
0.00%
发文量
138
审稿时长
11 months
期刊介绍: Published since 1928, Water Environment Research (WER) is an international multidisciplinary water resource management journal for the dissemination of fundamental and applied research in all scientific and technical areas related to water quality and resource recovery. WER''s goal is to foster communication and interdisciplinary research between water sciences and related fields such as environmental toxicology, agriculture, public and occupational health, microbiology, and ecology. In addition to original research articles, short communications, case studies, reviews, and perspectives are encouraged.
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