Abstract
The general aim of this study was to address the problem of seed vigour testing in Acacia senegal and Acacia mellifera) by studying different seed vigour tests and comparing them to identify the most suitable test for each species. The importance of this study lies in the fact that vigour testing measures the percentage of viable seeds in a sample as well as their ability to produce normal seedlings under less than optimum or adverse growing conditions, similar to those occurring in the field. To achieve this objective, a set of laboratory and field tests were conducted for the two Acacia species. Data collected included: The number of seeds per kilogram, germination percentage, seedling shoot length, seedling root length, seedling root wet and dry weight, seedling shoot wet and dry weight. The cutting test, electrical conductivity tetrazolium test and Hiltner test were employed to determine the seed vigour.
 The results showed that Acacia mellifera had a high electrical conductivity, indicating its low seed vigour. The electrical conductivity of Acacia senegal was equivalent to that of distilled water, indicating that either the seed coat was intact or no ions were leached from the seeds. Comparison of the various tests suggests that Hiltner test is the most accurate” or “reliable”) test for seed vigor.
Highlights
Acacia is a genus of the subfamily Mimosoideae (Rehman et al, 1999) that occurs across a wide range of ecosystems, from arid deserts to montane forests, with growth forms that include small shrubs, lianas and large trees (New, 1984)
As Acacia Senegal had 82% sound seeds and Acacia mellifera had 88%, they were predicted to reach this percentage when these seeds w sown (Figure 1)
The weather conditions are sometimes unfavourable during maturation of the seed crop and affect the seed quality directly and indirectly
Summary
Acacia is a genus of the subfamily Mimosoideae (Rehman et al, 1999) that occurs across a wide range of ecosystems, from arid deserts to montane forests, with growth forms that include small shrubs, lianas and large trees (New, 1984). The success of any planting depends on the seed quality, planting techniques, and knowledge of the appropriate species to be planted as well as the amount of seeds required for planting (AOSA, 2008). Seed vigour is the key element for seed quality. Many vigour tests have been developed for the rapid estimation of seed vigour in seed programs. Since Acacia species are valuable trees in Sudan; it is essential to have proper vigour tests to evaluate the seeds of Acacia and improve seed quality, which would enhance its ijas.ideasspread.org
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