不同盐度对苦草生理特征的影响

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Abstract

People have paid more and more attention to the salt tolerance of submerged plants recently. The content of chlorophyll a in the leaves, the activity of SOD, POD and CAT, the MDA content and the respiration intensity of Vallisneria natans at every 24 hours were tested in laboratory simulation condition, with salinity gradients of 0 (the control group), 2, 3, 4, 5, 6 and 8. The results showed that chlorophyll a, chlorophyll b and CAT activity decreased with the increase of salinity; the enzyme activity of SOD and POD, and the MDA content increased firstly and then dropped with the increasing salinity. Chlorophyll content, the enzyme activity of antioxidant enzymes, MDA content and respiration intensity index in salinities 2 and 3 were not significantly different from those in the control group (p＞0.05), and V. natans grew better than other treatment groups. There were significant differences (p＜0.05) in chlorophyll content, the enzyme activity of antioxidant enzymes, MDA content and respiration intensity index between the treatment group of salinity 4 and the control group. The chlorophyll content decreased obviously, antioxidant enzymes activity increased and showed an obvious resistance, and respiration intensity reduced. The growth of V. natans in the treatment groups of salinities 5, 6 and 8 was worse than in the control group, and V. natans withered gradually and finally were dead on the forth day. As a result, V. natans can be used in the submerged vegetation restoration and reconstruction under the water salinity less than 3.

Key words： Vallisneria natans salinity chlorophyll enzyme activity respiration intensity

Received: 25 December 2012

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	Articles by authors
	LIU Xiao-pei
	ZHANG Yin-jiang
	LI Yan
	DONG Yue
	YI Mian
	WEN Xiao-feng

Cite this article:

LIU Xiao-pei,ZHANG Yin-jiang,LI Yan, et al. Effect of different salinity on physiological features of Vallisneria natans[J]. , 2012, 31(6): 606-612.

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http://www.ecolsci.com/EN/ OR http://www.ecolsci.com/EN/Y2012/V31/I6/606

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