不同盐度对鱼藤幼苗生长及光合作用的影响

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Abstract

Derris trifoliata is a vine plant that commonly grows in the edges of mangroves in China. In order to understand its response and adaptability to salt stress in inter-tidal habitats, we manipulated 0～40‰ salinities on the seedlings of D. trifoliata, and investigated the growth, photosynthesis and chlorophyll fluorescence of the seedlings. The results showed that D. trifoliata seedlings grew faster under 20‰ salinity. The root-shoot ratio declined with the increase of salinity, indicating salt stress had a greater effect on underground biomass than aboveground biomass. Net photosynthetic rate (Pn), transpiration rate (Tr) and stomatal conductance (Gs) decreased significantly with the increase of salinity. Intercellular CO₂ concentration (Ci) decreased first and then increased, with the minimum value occurring under 20‰ salinity; while transpiration rate (Tr) and stomatal limitation value (Ls) exhibited a reverse trend. PSⅡactual photochemical quantum yield decreased significantly, while non-photochemical quenching coefficient was opposite. The results suggested that higher salinity inhibited the growth, photosynthesis and chlorophyll fluorescence of D. trifoliata seedlings and that lower salinity (≤20‰) was propitious to the growth of D. trifoliata seedlings.

Key words： Derris trifoliata salinity growth photosynthesis mangrove

Received: 25 April 2010

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	Articles by authors
	YUAN Xia
	ZHANG Yi-hui
	HUANG Guan-min
	WANG Wen-qing

Cite this article:

YUAN Xia,ZHANG Yi-hui,HUANG Guan-min, et al. Effects of different salinities on the growth and photosynthesis of Derris trifoliata seedlings[J]. , 2010, 29(2): 102-108.

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http://www.ecolsci.com/EN/ OR http://www.ecolsci.com/EN/Y2010/V29/I2/102

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