梭鱼草化感物质丁二酸对微囊藻和栅藻生长及竞争的影响

生态学杂志

梭鱼草化感物质丁二酸对微囊藻和栅藻生长及竞争的影响

许蓝心,田如男^*

（南京林业大学风景园林学院，南京 210037）

出版日期:2019-03-10 发布日期:2019-03-10

Effects of succinic acid, an allelopathic substance of Pontederi cordata, on the growth and competition of Microcystis aeruginosa and Scenedesmus obliquus.

XU Lan-xin, TIAN Ru-nan^*

(College of Landscape Architecture, Nanjing Forestry University, Nanjing 210037, China).

Online:2019-03-10 Published:2019-03-10

摘要/Abstract

摘要： 为了解梭鱼草（Pontederia cordata）根茎有机酸类化感物质对铜绿微囊藻（Microcystis aeruginosa，M）和斜生栅藻（Scenedesmus obliquus，S）生长和竞争关系的影响，将不同浓度丁二酸作用于两种藻的单种培养和共培养，即铜绿微囊藻与斜生栅藻初始比例为1∶0（100% M）、1∶1（50% M+50% S）、2∶3（40% M+60% S）、3∶2（60% M+40% S）、0∶1（100% S）。结果表明：丁二酸对铜绿微囊藻和斜生栅藻均有抑制作用，抑制能力与浓度呈正相关；无化感物质作用下，单种培养和共培养中铜绿微囊藻生长能力均强于斜生栅藻；60 mg·L^-1丁二酸处理下，40% M+60% S、50% M+50% S培养组中β（斜生栅藻对铜绿微囊藻的抑制参数）>0，60% M+40% S培养组中β<0，表明藻类初始比例影响蓝绿藻之间竞争；丁二酸可改变蓝绿藻之间竞争关系，低浓度（20、40 mg·L^-1）作用下，表现为铜绿微囊藻抑制斜生栅藻，斜生栅藻促进铜绿微囊藻，高浓度（60、80 mg·L^-1）作用下，表现为两者相互抑制，表明两种藻之间竞争加强。

Abstract: To understand the impacts of organic acids released by roots of Pontederia cordata on growth and competition of Microcystis aeruginosa and Scenedesmus obliquus, single culture and mix-culture of the two species were treated with succinic acid at different concentrations in a laboratory control environment. The initial ratio of M. aeruginosa toS. obliquus in BG11 medium was 1∶0 (100% M), 1∶1 (50% M+50% S), 2∶3 (40% M+60% S), 3∶2 (60% M + 40% S) and 0∶1 (100% S). Succinic acid exhibited a strong inhibitory effect on growth of M. aeruginosa and S. obliquus, and the magnitude of such effect was positively correlated with the concentration of succinic acid. In the absence of succinic acid, M. aeruginosa cultured with or without S. obliquushad a faster growth rate than S. obliquus.With the addition of 60 mg·L^-1 succinic acid, β (an inhibitory parameter of S. obliquus toM. aeruginosa) was more than 0 when the ratio of M. aeruginosa to S. obliquus was 2∶3 or 1∶1 and less than 0 when the ratio ofM. aeruginosa toS. obliquus was 3∶2, indicating that the inhibitory effect of one to another varied with the initial proportion of the two species. The succinic acid could change the competition between M. aeruginosa and S. obliquus. Under low concentrations (20, 40 mg·L^-1), M. aeruginosa inhibited S. obliquus, butS. obliquus promoted M. aeruginosa. Under high concentrations (60, 80 mg·L^-1), the performance of both species was mutually inhibited, indicating an intensified competition.

许蓝心,田如男. 梭鱼草化感物质丁二酸对微囊藻和栅藻生长及竞争的影响[J]. 生态学杂志.

XU Lan-xin, TIAN Ru-nan. Effects of succinic acid, an allelopathic substance of Pontederi cordata, on the growth and competition of Microcystis aeruginosa and Scenedesmus obliquus.[J]. cje.