Ecophysiological Studies on Certain Wild Plants Grown in Different Habitats in The Egyptian Deserts
Amal Ahmed Morsy Ahmed;
Abstract
The present work deals with the study of ecophysiological adaptive responses of both halophytes and species of wide ecological amplitude under different habitat conditions of two concerned regions (Red Sea and Sinai Peninsula) during winter and summer seasons.
The changes in plant succulence, mineral composition, photosynthetic pigments, carbohydrates, quaternary ammonium salts, proline, total soluble protein,
protein pattern, total lipids, phospholipids, fatty acid composition and growth regulators were discussed in relations to habitat conditions.
From the ecophysiological results, it could be concluded that both of halophytes and species of wide ecological amplitude tended to increase their ash contents
concomitantly with the development of succulence and general tendency towards the accumulation ofCr, Na+, K+, Ca2+ and Mi+. Also, the accumulations of
photosynthetic pigments, carbohydrates, quaternary ammonium compounds, proline, total soluble proteins total lipids, sterols and short chain fatty acids in the studied species represent different mechanisms through
which the plants tolerate both physiological drought and salinity stress.
Salt stress in the most studied species was
associated with the formation of certain adaptive stress proteins, which may play a role in protecting the membranes.
In most of the studied species an increment in the
amount of detectable auxins, gibberellins and cytokinins and a decrease in ABA level were observed during summer, which may be involved in increasing the degree of succulence.
The changes in plant succulence, mineral composition, photosynthetic pigments, carbohydrates, quaternary ammonium salts, proline, total soluble protein,
protein pattern, total lipids, phospholipids, fatty acid composition and growth regulators were discussed in relations to habitat conditions.
From the ecophysiological results, it could be concluded that both of halophytes and species of wide ecological amplitude tended to increase their ash contents
concomitantly with the development of succulence and general tendency towards the accumulation ofCr, Na+, K+, Ca2+ and Mi+. Also, the accumulations of
photosynthetic pigments, carbohydrates, quaternary ammonium compounds, proline, total soluble proteins total lipids, sterols and short chain fatty acids in the studied species represent different mechanisms through
which the plants tolerate both physiological drought and salinity stress.
Salt stress in the most studied species was
associated with the formation of certain adaptive stress proteins, which may play a role in protecting the membranes.
In most of the studied species an increment in the
amount of detectable auxins, gibberellins and cytokinins and a decrease in ABA level were observed during summer, which may be involved in increasing the degree of succulence.
Other data
| Title | Ecophysiological Studies on Certain Wild Plants Grown in Different Habitats in The Egyptian Deserts | Other Titles | دراسات بيئية وفسيولوجية على نباتات برية نامية فى بيئات مختلفة فى الصحارى المصرية | Authors | Amal Ahmed Morsy Ahmed | Keywords | Avicennia marina, Atriplex farinosa, Limonium axillare, Nitraria retusa, Halocnemum strobilaceum, Arthrocnemum glaucum, Sa/sola tetrandra, salinity, drought, halophytes, species of wide ecological amplitude, osmotic adjustment. | Issue Date | 2002 |
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