Ignored effects of phosphite (P+III) on the growth responses of three typical algae species
Ignored effects of phosphite (P+III) on the growth responses of three typical algae species
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忽略亚磷酸盐 (P III) 对三种典型藻类生长反应的影响
DOI：
10.1016/j.envpol.2021.118672
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发表时间：
2022-02-01
影响因子：
8.9
通讯作者：
Shen, Qiushi
中科院分区：
文献类型：
--
作者：
Han, Chao;Ren, Jinghua;Shen, Qiushi
目前，水体中磷+III的普遍分布和丰度的增加引起了人们对其生物利用度和潜在毒性的严重关注。然而，我们对这些问题的了解相对有限。我们研究了先前未知的P+III对三种主要藻类的影响，即微囊铜绿菌（M. aeruginosa），小球藻（C. pyrenoidesa）和Cyclotella。中国富营养化水体中的sp。以0.01 ~ 0.7 mg/L P+III作为唯一或替代磷源处理的藻类细胞生物量、特定生长率和Chl-a均显著下降，说明P+III对藻类生长有抑制作用。此外，P+III胁迫显著提高了细胞内超氧化物歧化酶（SOD）和丙二醛（MDA）活性。绿脓杆菌和环菌。sp细胞对P+III毒性较C. pyrenoidesa更敏感，因为细胞膜受到更严重的应激和破坏。综上所述，磷+III不能作为生物可利用磷，但对被试藻类具有一定的毒性。这表明富营养化水体中磷+III丰度的增加会加速藻类细胞的死亡，从而对藻华产生积极的抑制作用。我们的研究结果为评估水生环境中磷+III的生态风险提供了新的见解。
Nowadays, the ubiquitous distribution and increasing abundance of P+III in waterbodies have caused serious concerns regarding its bioavailability and potential toxicity. However, our knowledge on these issues is relatively limited. We addressed previously unknown effects of P+III on three dominate algae species i.e. Microcystic aeruginosa (M. aeruginosa), Chlorella pyrenoidesa (C. pyrenoidesa) and Cyclotella. sp in eutrophic waterbodies in China. Remarkable declines in biomass, specific growth rate and Chl-a of algae cells treated with 0.01-0.7 mg/L P+III as sole or an alternative P source were observed, indicating P+III had an inhibitory effect on the algal growth. Besides, the intracellular enzyme activities e.g superoxide dismutase (SOD) and malondialdehyde (MDA) were significantly increased with P+III stress. M. aeruginosa and Cyclotella. sp cells seemed to be more sensitive to P+III toxicity than C. pyrenoidesa since cell membrane suffered more serious stress and destruction. These findings combined, it confirmed P+III could not be utilized as bioavailable P, but had certain toxicity to the tested algae. It indicated that the increased P+III abundance in eutrophic waterbodies would accelerate the algal cell death, which could have a positive effect against algal blooms. Our results provide new insights into assessing the ecological risks of P+III in aquatic environments.