Mangroves: obligate or facultative halophytes? A review

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	Mangroves: obligate or facultative halophytes? A review
	Wang, Wenqing ; Yan, Zhongzheng ; You, Siyang ; Zhang, Yihui ; Chen, Luzhen ; Lin, Guanghui ; Wang WQ(王文卿) ; Zhang YH(张宜辉) ; Chen LZ(陈鹭真) ; Lin GH(林光辉)
刊名	http://dx.doi.org/10.1007/s00468-011-0570-x
	2011-12
关键词	RHIZOPHORA-MANGLE L MARINA FORSK VIERH AVICENNIA-MARINA GAS-EXCHANGE SALT-TOLERANCE BRUGUIERA-SEXANGULA KANDELIA-CANDEL WATER RELATIONS SALINITY GRADIENTS SONNERATIA-ALBA
英文摘要	National Natural Science Foundation of China [40776046]; National Basic Research Program of China [2009CB426306]; China State Administration of Oceanography [200905009]; Salinity plays significant roles in regulating the growth and distribution of mangroves, and the salt tolerance mechanisms of mangroves have been the focus of research for several decades. There are contradictory views regarding the relationship between mangroves and salt: (1) Mangroves are facultative halophytes, i.e. freshwater is a physiological requirement and salt water is an ecological requirement for mangroves because they are capable of growing in freshwater. The former prevents excess respiratory losses while the latter prevents invasion and competition from non-halophytes. (2) Mangroves are obligate halophytes, i.e. salt is necessary for their growth. Mangroves cannot survive in freshwater permanently and salt water is a physiological requirement. Up to now, mangroves are usually considered as facultative halophytes. In this review, we provided five lines of evidence to evaluate these two contradictory views: (1) the results of laboratory culture experiments and field investigations; (2) the viviparous nature of mangroves; (3) the salt accumulation of mangroves under freshwater or low salinity; (4) the effect of salinity on the photosynthetic rate and in vitro enzyme activities, and (5) the effects of salinity fluctuation on mangrove growth and physiology. Contrary to widely accepted view, our evaluations of the aforementioned evidence suggest that mangroves are obligate halophytes. Mangroves can grow in freshwater for a limited time by drawing upon the nutrients and salt reserves in their hypocotyls while prolonged culture in freshwater is fatal to them. Mangroves have the ability to absorb Na+ and Cl- rapidly and preferentially under low-salinity conditions. Not all of the enzymes in mangroves are sensitive to salt. In fact, the activities of some enzymes are even stimulated by low or moderate salinity. Plants grown under constant salinity in a laboratory setting are unlikely to behave in the same way as those in their natural habitat with fluctuating salinity. Thus, studies on the effects of freshwater or low salinity and salinity fluctuation on mangroves, as well as the physiological mechanisms that allow maintenance of function under fluctuating salinity conditions should be strengthened in future research.
语种	英语
出版者	TREES-STRUCT FUNCT
内容类型	期刊论文
源URL	[http://dspace.xmu.edu.cn/handle/2288/90510]
专题	生命科学－已发表论文
推荐引用方式 GB/T 7714	Wang, Wenqing,Yan, Zhongzheng,You, Siyang,et al. Mangroves: obligate or facultative halophytes? A review[J]. http://dx.doi.org/10.1007/s00468-011-0570-x,2011.
APA	Wang, Wenqing.,Yan, Zhongzheng.,You, Siyang.,Zhang, Yihui.,Chen, Luzhen.,...&林光辉.(2011).Mangroves: obligate or facultative halophytes? A review.http://dx.doi.org/10.1007/s00468-011-0570-x.
MLA	Wang, Wenqing,et al."Mangroves: obligate or facultative halophytes? A review".http://dx.doi.org/10.1007/s00468-011-0570-x (2011).