PJB-2018-1035
Switching from juvenile leaves to phyllode of Acacia saligna (Labill.) H.L.Wendl. proved by the control of seedlings and stump sprout leaves
Sondes Stambouli-Essassi, Ichrak Sammoud-Ben Rejeb, Sadok Bouzid and Fethia Harzallah Skhiri
Abstract
This work investigates the foliage’s changes reported on seedlings and regenerated sprouts of Acacia saligna (Labill.) H.L.Wendl. cultivated in Tunisia. First, a tracking of leaves development on 50 three-month old heteroblastic seedlings was performed. The transition from juvenile foliage to mature leaves occurs through four several stages. The first two leaves were pinnately compound and stand opposite each other (stage 1). The following initiated five leaves are alternate and bipinnately compound (stage 2). The eighth leaf corresponds to a transition form (stage 3). After three months of growth, from the ninth leaf, seedlings start the initiation of phyllodes (stage 4). Second, in order to better understand the leaves’ chronological switching and to examine the influence of the cutting height on the sprouting ability and on the biomass production, a total of 60 adult trees of A. saligna were randomly selected and cut at heights of 10, 30 and 50 cm aboveground level (20 trees each). The results indicated that the 50 cm stump height alowed a maximum rejuvenation expressed by the highest number of sprouts and juvenile bipinnately compound leaves; reminding those that have been developed on seedlings. Also, six-month old sprouts promoted the best transition phenomenon rate, the longest and the broadest phyllodes that are more vigorous than those developed on seedlings and adult trees
To Cite this article:
Sondes Stambouli-Essassi, Ichrak Sammoud-Ben Rejeb, Sadok Bouzid and Fethia Harzallah Skhiri - Switching from juvenile leaves to phyllode of Acacia saligna (Labill.) H.L.Wendl. proved by the control of seedlings and stump sprout leaves. Pak. J. Bot., 52(3): DOI: http://dx.doi.org/10.30848/PJB2020-3(2)
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