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Pak. J. Bot., 46(2): 465-470, 2014. |
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Updated: 05-04-14 | ||||
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AUTO TOXICITY OF AVICENNIA MARINA (FORSK.) VIERH IN PAKISTAN
KANWAL NAZIM1*, MOINUDDIN AHMED2, SYED SHAHID SHAUKAT2, MUHAMMAD UZAIR KHAN1 AND SYED SADRUDDIN HUSSIAN2
Abstract: During field survey it was observed that despite the presence of full sunlight mangrove forests show gaps or small number of stunted seedlings. These observations leaded to consider evaluation of autotoxicity of A.marina, therefore a glasshouse experiment was conducted to observe the possible allelopathic effects of leaf and pneumatophore extracts of Avicennia marina on its own seedling survival and growth. Two different types of soil with a total of five treatments of leaves and pneumatophores were used including control amid five replicates. The results showed that the extracts from Avicennia leaves and pneumatophores had inhibitory effects on it’s own growth. The leaf extracts showed stronger allelopathic effects than pneumatophore extracts on root length and dry weight while pneumatophore extracts had greater allelopathic effects on shoot height. Therefore, it may also be concluded that besides shade, allelopathy may be responsible for lack of Avicennia seedlings under its own mother plant.
1Marine Reference Collection and Resouce Centre, University of Karachi 2Laboratory of Dendrochronology and Plant Ecology, Department of Botany and Gulshan-e-Iqbal, Karachi, Pakistan *Corresponding author e-mail: nazim_kanwal@yahoo.com |
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