Seed dormancy and dormancy breaking of selected Acacia species from Sub-Saharan Africa
The Acacia species are widely distributed in the Sub-Sahara and are of significant importance in terms of economic value and for restoration. Seed dormancy is common in Acacia species, and it creates difficulties in seed testing and planting. In the current study, we investigated the degree of dormancy and the effect of different pre-treatments on dormancy breaking in selected Acacia species. The degree of dormancy varied among the species, they were 81% for Acacia nilotica, 74% for A. seyal, 15% for A. mellifera and 5% for A. senegal. The best treatments were from 10 to 90 minutes for A. seyal and 60 to 90 minutes for A. nilotica. These treatments all reduced hard seeds to 0 and did not cause damage to the seeds. The lens was identified as the initial site of water intake in the seeds of A. nilotica, whereas in A. seyal, A. senegal, and A. mellifera, the hilum and lens were both identified as the sites of primary water uptake. Further, cellular features differed among the species. A. seyal and A. nilotica seeds showed a thick but compact palisade epidermal layer; A. senegal and A. mellifera seeds had a less compact, thin palisade layer.
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Document Type: Research Article
Publication date: July 1, 2019
This article was made available online on May 18, 2019 as a Fast Track article with title: "Seed dormancy and dormancy breaking of selected Acacia species from Sub-Saharan Africa".
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