Journal ArticleDOI
Desiccation tolerant vascular plants of southern Africa.
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Drought tolerance limits are given for 36 new ‘resurrection plants’, sufficient to double the number of desiccation tolerant plants reported from southern Africa.Abstract:
Drought tolerance limits are given for 36 new 'resurrection plants', sufficient to double the number of desiccation tolerant plants reported from southern Africa. Tolerance limits for angiosperm examples are usually better than those for ferns. Air-dry foliage survives for 1/2 to 5 years or more, unless stored in humidities above 50% RH Abbreviation: RH = relative humidity . Dehydration is sufficiently slow (usually 2-3 days) to allow the possibility of a tolerance induction process, like that found in Borya nitida. Rehydration after rain is usually complete in 1/2 to 1 day. A significant proportion of rain is absorbed through the leaf surface, but there is no evidence of appreciable rehydration from dew.Resurrection plants are usually pioneers in xeroseres, but they often lack xeromorphic characteristics. Anthocyanin pigmentation during drying is a reliable indicator of viability in some species.read more
Citations
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Journal ArticleDOI
Physiological Aspects of Desiccation Tolerance
TL;DR: The results obtained allowed us to assess the importance of knowing the carrier and removal status of canine coronavirus, as a source of infection for other animals, not necessarily belonging to the same breeds.
Journal ArticleDOI
The evolution of vegetative desiccation tolerance in land plants
TL;DR: It is hypothesize that the mechanism of desiccation tolerance exhibited in seeds, a developmentally induced cellular protection system, evolved from the primitive form of vegetative desICcation tolerance, which was established in seeds by environmental cues related to drying.
Journal ArticleDOI
Poikilohydry and homoihydry: antithesis or spectrum of possibilities?
TL;DR: This work describes how desiccation tolerance is adaptively optimal on hard substrates impenetrable to roots, and on poor dry soils in seasonally dry climates, and how this tolerance is induced by water stress in vascular plants.
Book ChapterDOI
Water in Tissues and Cells
Melvin T. Tyree,P. G. Jarvis +1 more
TL;DR: Tyree and Hammel (1972) have argued that it is meaningful to define bulk values of the water relations parameters to characterize the water Relations properties of tissues and organs.
Journal ArticleDOI
Molecular cloning of abscisic acid-modulated genes which are induced during desiccation of the resurrection plant Craterostigma plantagineum
TL;DR: Data on endogenous ABA contents before and after stress applications and on the physiological effects of exogenous ABA treatments indicate that in Craterostigma plantagineum the induction of an extreme desiccation tolerance is mediated by this plant hormone.
References
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Modern methods of plant analysis
Journal ArticleDOI
The Use of Non-permeating Pigments for Testing the Survival of Cells
D. F. Gaff,O. Okong'o-Ogola +1 more
Journal ArticleDOI
Desiccation-tolerant flowering plants in southern Africa.
TL;DR: The South African flora contains a unique abundance of higher plants which withstand virtually complete desiccation, and known examples were increased from 4 to 15 species, which for the first time included grasses.