Seedling size and cotyledon retention have important influences on survival of defoliated seedlings of Pterocarpus erinaceus Poir. (African rosewood)
Paper Details
Seedling size and cotyledon retention have important influences on survival of defoliated seedlings of Pterocarpus erinaceus Poir. (African rosewood)
Abstract
Browsing by animals is a recognized bottleneck to the establishment success of tree seedlings. Pterocarpus erinaceus may be particularly susceptible to browsing as a result of being a highly palatable fodder plant. The fate of browsed seedlings is often uncertain because factors that determine post-defoliation survival among tree seedlings are unclear. We conducted a plant house experiment employing a cross-factored three factor design that involved two levels each of defoliation, seedling size and cotyledon retention to test three hypotheses as follows: 1. defoliation decreases survival of P. erinaceus seedlings; 2. larger seedlings survive defoliation better than smaller ones; 3. retention of cotyledons enhances survival and growth of defoliated seedlings. Consistent with hypotheses 1 and 2, defoliation decreased survival of P. erinaceus seedlings and this adverse effect was found to exist almost entirely among small seedlings. The odds of a defoliated seedling surviving was 13.4 times lower if it was small than if it was large. Partly consistent with hypothesis 3, seedlings that retained their cotyledons had a higher number of new leaves than seedlings in which cotyledons were excised, but direct effect of cotyledon retention on seedling survival was not found. Implications of findings are discussed.
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Hamza Issifu, Adam Jaleelu, Rikiatu Husseini (2015), Seedling size and cotyledon retention have important influences on survival of defoliated seedlings of Pterocarpus erinaceus Poir. (African rosewood); IJB, V7, N5, November, P30-37
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