Significance of cryptovivipary in Aegiceras corniculatum (L.) Blanco

Bhosale, Leela J.; Shinde, L. S.

doi:10.1007/978-94-017-0914-9_14

Cited by 3 publications

(1 citation statement)

References 4 publications

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“…In addition to the nutrients and energy reserves in hypocotyls, mangrove hypocotyls contain large amounts of Na ? and Cl - (Downton 1982;Bhosale and Shinde 1983;Clough 1984;Wang et al 2002). Even growing in freshwater for a few months, mangrove seedlings still maintain high levels of Na ?…”

Section: Viviparous Reproductive Strategymentioning

confidence: 94%

Mangroves: obligate or facultative halophytes? A review

Wang

Yan

You

et al. 2011

Trees

100

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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 Clrapidly 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.

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Section: Viviparous Reproductive Strategymentioning

confidence: 94%

Mangroves: obligate or facultative halophytes? A review

Wang

Yan

You

et al. 2011

Trees

100

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Seedling morphology of some mangroves of sundarbans, India: A taxonomic approach: With 4 figures and one table

2001

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Germination type and seedling morphology of 16 true mangrove species under ten families were studied. Seedlings were either raised in vitro or collected from natural habitat. True viviparous type of germination occurs in the members of Rhizophoraceae, cryptocotylar hypogeal in Excoecaria, Heritiera, Phoenix and Xylocarpus, phanerocotylar geal type in Aegiceras and Aegialitis, and phanerocotylar epigeal type in the rest of the taxa. Viviparous germination is considered to be the most complex phenomenon in evolutionary line. An intermediate incipient vivipary is prominent in Aegiceras, Aegialitis and Avicennia, which may be, included in a separate group namely cryptoviviparous type. The germination types have been discussed in the light of their habitat. An identification key to the genera has been provided on the basis of germination type and seedling morphology.

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Hypocotyl Function in Seedling Development of the Red Mangrove, Rhizophora mangleL.¹

Smith

Snedaker

2000

Biotropica

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Significance of cryptovivipary in Aegiceras corniculatum (L.) Blanco

Cited by 3 publications

References 4 publications

Mangroves: obligate or facultative halophytes? A review

Mangroves: obligate or facultative halophytes? A review

Seedling morphology of some mangroves of sundarbans, India: A taxonomic approach: With 4 figures and one table

Hypocotyl Function in Seedling Development of the Red Mangrove, Rhizophora mangleL.¹

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Significance of cryptovivipary in Aegiceras corniculatum (L.) Blanco

Cited by 3 publications

References 4 publications

Mangroves: obligate or facultative halophytes? A review

Mangroves: obligate or facultative halophytes? A review

Seedling morphology of some mangroves of sundarbans, India: A taxonomic approach: With 4 figures and one table

Hypocotyl Function in Seedling Development of the Red Mangrove, Rhizophora mangleL.1

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Hypocotyl Function in Seedling Development of the Red Mangrove, Rhizophora mangleL.¹