Does Egypt Represent an Ecological Limit to Desiccation Tolerant Plants?

Show simple item record Fahmy, Gamal, M [جمال محمد فهمي] en_US Gaff, D. F. [دون ف جاف] en_US Abd El Ghani, M. M. [منير محمد عبد الغني] en_US
date.accessioned 2009-11-25T15:26:57Z en_US
date.available 2009-11-25T15:26:57Z en_US
date.issued 2006 en_US
identifier.citation Qatar University Science Journal, 2006, Vol. 26, Pages 91-100. en_US
identifier.uri en_US
description.abstract A search of arid areas adjacent to the Nile in Egypt revealed a notable lack of desiccation tolerant vascular plants on ecological sites on which they would be abundant in Kenya and further south in Africa. Relative water contents (RWC); the water content of the tissue as a percentage of its water content at full turgor; were estimated after the tissue had been floated on water for 24h and then dried in a 70° C oven to avoid errors due to decomposition at higher temperatures. Viability of the rehydrated tissue was judged from tests of the retention of semipermeability of the cell membranes and by formation of chlorophyll in non-chlorophyllous tissue in the light. Possible causes of their apparent absence from suitable sites in the Aswan-Qena area are discussed. We attribute their absence to time durations between effective rainfall events that exceed the longevity of resurrection plants while in an air-dry anabiotic condition. This is, to our knowledge, the first report of an aridity-related factor that may present an ecological limit to fully desiccation-tolerant plants. en_US
language.iso en en_US
publisher Qatar University en_US
subject Biology en_US
subject بيولوجيا ar
title Does Egypt Represent an Ecological Limit to Desiccation Tolerant Plants? en_US
title.alternative هل تمثل مصر حدا بيئيا لنباتات المتحملة للتجفيف؟ ar
type Article en_US
identifier.pagination 91-100 en_US
identifier.volume 26 en_US

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