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
- 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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