biologia plantarum

International journal on Plant Life established by Bohumil Nìmec in 1959

Biologia plantarum 53:373-377, 2009 | DOI: 10.1007/s10535-009-0070-7

Ultrastructural responses of the desiccation tolerant plants Xerophyta viscosa and X. retinervis to dehydration and rehydration

A. Bhatt1,*, Y. Naidoo1, S. Gairola1, A. Nicholas1
1 School of Biological and Conservation Sciences, University of KwaZulu-Natal, Durban, South Africa

This paper compares the changes in water content, chlorophyll a fluorescence and leaf ultrastructure during dehydration and rehydration in two desiccation tolerant plants Xerophyta viscosa and X. retinervis. Both species showed decreasing quantum efficiency of photosystem 2 (Fv/Fm) with decreasing water content. Extreme water loss observed after 25 d of dehydration resulted in considerable damage of leaf tissue ultrastructure. After rehydration, both species need several days to reconstitute their photosynthetic machinery.

Keywords: drought tolerance; poikilochlorophyllous species; quantum efficiency; relative water content; resurrection plant; transmission electron microscopy
Subjects: chlorophyll fluorescence; chloroplast; leaf ultrastructure; rehydration; relative water content (RWC); transmission electrom microscopy; ultrastructure; water stress; Xerophyta retinervis; Xerophyta viscosa

Received: May 27, 2008; Accepted: April 15, 2009; Published: June 1, 2009  Show citation

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Bhatt, A., Naidoo, Y., Gairola, S., & Nicholas, A. (2009). Ultrastructural responses of the desiccation tolerant plants Xerophyta viscosa and X. retinervis to dehydration and rehydration. Biologia plantarum53(2), 373-377. doi: 10.1007/s10535-009-0070-7
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