Genetic Variation in Growth Traits between Locations, Gum Production and Families of Acacia senegal (L) Willd Seedlings from Northern Kordofan, Sudan.

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Date
2015-06-22
Authors
Khalid Abd Alla, Hussein
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Publisher
UOFK
Abstract
In this study genetic variation of Acacia senegal at seedling stages were evaluated for growth traits. Seeds were collected from open pollinated trees that are high, average and low gum yielders (according to gum owners and tappers judgement). The parent trees were from two locations in Northern Kordfan, Elaiet Abu Hibailat and Es Saata Bukhari, at the same latitude. The seeds were treated with sulfuric acid (95 %) and sown directly in polythene tubes establishing 150 families (75 for each location and 25 for each production level within each location ).The experiment was carried out in Soba Finnish nursery using randomized complete block design with three replications. Growth was assessed at seven intervals by destructive sampling (seven harvests) starting four weeks after sowing and then every three weeks. The variables were root length, root number, root fresh weight, root dry weight, shoot height, shoot fresh weight, shoot dry weight, leaves number, leaves dry weight and dry weight root: shoot ratio. Individual tree narrow sense heritability (h12) was estimated for locations and production levels within location at each harvest. Statistical Analysis System (SAS) procedure was used for the statistical analysis. The two locations varied according to traits and harvests. Significant differences were observed in the seven harvests for the root fresh weight, root dry weight, shoot height, shoot fresh weight, shoot dry weight, leaves number and leaves dry weight. The differences in root length and root: shoot ratio were significant only in some harvests. Root number difference was not significant except in harvest 5 Also, significant differences were observed between the production levels within each location and between families within production levels in some harvests for all characters except root number. h2 were generally low (< 0.40) for root traits in most of the harvests, while they were high in most of the harvests for shoot traits. The significant differences between locations reflect that the trees of each location are well adapted to the environmental conditions prevailing at that area. The significant differences between production levels and between families in the growth traits indicate that these traits are genetically variable. The magnitude of this genetic variability depends on the traits and the harvests. The low heritabilities obtained for root traits indicate that root traits are survival traits with low genetic variability. The location differences reflect that moving of seeds across zones, planting site conditions must be carefully considered. Also, the significant differences observed between families suggest that selection of individual trees for characters such as shoot height and leaves number may lead to improvement of such characters.
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Genetic Variation in Growth Traits between Locations, Gum Production and Families of Acacia senegal (L) Willd Seedlings from Northern Kordofan, Sudan
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