Comparsion of Ecophysiological Responses of Acacia raddiana and Acacia nilotica During Seedling Establishment in Extreme Arid Conditions | ||
| Egyptian Journal of Botany | ||
| Article 23, Volume 60, Issue 2, August 2020, Pages 593-603 PDF (1.13 M) | ||
| Document Type: Regular issue (Original Article) | ||
| DOI: 10.21608/ejbo.2020.19626.1389 | ||
| Authors | ||
| Usama Radwan* ; Tarek Radwan; Esraa Abouelkasim | ||
| Botany Department, Faculty of Science, Aswan University, Sahari, 81528, Aswan, Egypt | ||
| Abstract | ||
| THE PRESENT investigation involves the studies of physiological responses of A. raddiana (savi) Brenan and A. nilotica (L.) seedlings under extreme arid conditions. Experiments were performed in a hyper arid environment to study the effects of drought stress using different water regimes at 12%, 9%, 6%, 4% and 2%. Photosynthesis and transpiration rate were measured under full Photosynthetic Active Radiationrange (0-2500μmols-1m-2) and instantaneous water use efficiency was calculated. A. raddiana and A. nilotica showed maximum photosynthesis rate under 4% and 12% soil moisture content, respectively at high Photosynthetic Active Radiation levels, maximum transpiration rate of A. raddiana recorded at 4% soil moisture content and at 9% soil moisture content in A. nilotica at highest Photosynthetic Active Radiation. The maximum instantaneous water use efficiency was noticed in A. raddiana at 12% soil moisture content, while A. nilotica showed maximum instantaneous water use efficiency at 6% soil moisture content at high Photosynthetic Active Radiation level. A. raddiana acted as water spender ideal desert plant at high Photosynthetic Active Radiation. Other wise A. nilotica maximised photosynthesis rate and minimised transpiration rate giving maximum instantaneous water use efficiency at high Photosynthetic Active Radiation and low soil moisture content levels. | ||
| Keywords | ||
| Desert plant; Drought stress; Instantaneous water use efficiency; Photosynthetic active radiation; Photosynthesis; Transpiration rate | ||
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