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植物学报  2015 

癸二烯醛对3种常见浮游植物生长和光合作用的影响

DOI: 10.3724/SP.J.1259.2015.00346, PP. 346-353

Keywords: 癸二烯醛,生长抑制,多不饱和醛,光合作用,浮游植物

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Abstract:

?多不饱和醛是硅藻细胞损伤后分泌的有机毒素,能够抑制桡足类的生殖和幼体发育,继而降低浮游动物对硅藻的摄食压力。但是有关多不饱和醛对浮游植物的毒性效应研究较少。选取东海原甲藻(Prorocentrumdonghaiense)、双突角毛藻(Chaetocerosdidymus)和小普林藻(Prymnesiumparvum)进行毒性实验,将处于指数生长期的藻细胞置于不同浓度的癸二烯醛中,观察浮游植物在细胞生长及光合作用方面对癸二烯醛的响应,从而评估多不饱和醛对藻类的影响。结果表明,浓度为1mg·L-1的癸二烯醛即可对东海原甲藻产生显著的抑制作用;当癸二烯醛浓度达到5mg·L-1时,东海原甲藻和双突角毛藻细胞的生长以及光合作用均受到极显著抑制;当癸二烯醛浓度达到10mg·L-1时,3种浮游植物的生长完全受到抑制,细胞密度、Fv/Fm、Yield值以及rETR均在24小时内降至0。研究结果表明,癸二烯醛显著抑制了浮游植物的生长及光合作用,但是不同藻类对癸二烯醛的毒性响应存在种间差异。多不饱和脂肪醛的产生有利于硅藻在营养盐缺乏时抑制其它浮游植物的生长,从而保证自身的生物量积累。

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