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Abstract
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Article Information:
Variation in Drought Tolerance and Survival among Three Provenances of Acacia tortilis Subspecies Radinana and Subspecies Spirocarpa Seedlings
Abdelbasit H. Elmagboul, Sadya Mahgoup and Ahamed ElDoma
Corresponding Author: Abdelbasit H. Elmagboul
Submitted: December 30, 2011
Accepted: February 06, 2012
Published: March 26, 2012 |
Abstract:
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The aim of this study was to investigate inter-specific variation in drought tolerance and survival
among three provenances of Acacia tortilis subspecies Raddiana and subspecies Spirocarpa under water stress.
The seeds were collected from White Nile (Elgetiana), Kassala (Halfa Elgadida) and River Nile (Shandi) states,
where the association of the two subspecies occurs in their natural habitats. The seeds of each subspecies per
each provenance were sown under three irrigation frequencies. Relative growth rate, relative water contents,
biomass production and mortality rates were measured. At the end of growth measurements water was totally
with held from all the seedlings and mortality was counted at one week interval. The results revealed significant
irrigation treatment and subspecies effects in relative growth rate, leaf relative water content and seedlings
mortality, where no significant differences exist between the provenances.Water stress increased relative water
content and decreased relative growth rate and mortality. Drought preconditioning increased seedlings survival
during the final dry-down compared to well-watered. Seedlings that had been preconditioned to drought
survived 14 days longer than those had been well watered. The high similarity between provenances might
reflect adaptation to near similar environmental conditions, whereas the variation within subspecies could be
due to genetic differentiation resulting from minor environmental differences or to individual tree differences
within provenances.
Key words: Acacia tortilis, mortality, provenances, Raddiana, relative growth rate, relative water content, subspecies, Spirocarpa
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Cite this Reference:
Abdelbasit H. Elmagboul, Sadya Mahgoup and Ahamed ElDoma, . Variation in Drought Tolerance and Survival among Three Provenances of Acacia tortilis Subspecies Radinana and Subspecies Spirocarpa Seedlings. Asian Journal of Agricultural Sciences, (2): 134-139.
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ISSN (Online): 2041-3890
ISSN (Print): 2041-3882 |
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