Reading: Long-term flooding stimulates stilit-root production in Avicennia marina

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Long-term flooding stimulates stilit-root production in Avicennia marina

Authors:

William G Allaway ,

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School of Biological Sciences A12 The University of Sydney NSW 2006.
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Mark Curran,

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School of Biological Sciences A12 The University of Sydney NSW 2006.
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Penny F. E Goulter,

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School of Biological Sciences A12 The University of Sydney NSW 2006.
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Christine A Newman,

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School of Biological Sciences A12 The University of Sydney NSW 2006.
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Malcolm C Ricketts

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School of Biological Sciences A12 The University of Sydney NSW 2006.
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Abstract

Plants of Avicennia marina (Forssk.) Vierh. Var. Australasica (Walp.) Moldenke ex N. C. Duke that had been continuosly flooded for about two months produced numerous downward-growing roots well above the soil surface, as they sometimes do after pollution events in the field. These downward-growing roots (stilt roots) were not produced by the non-flooded plants. The stilt roots generally resembled inverted normal pneumatophores, and had many lenticels on their surface. We suggest that a stimulus for stilt root production in this species may be an increase in ethene (ethylene) resulting from restricted ventilation. We suspect that threre is a requirement for some availability of oxygen to support the growth of new ventilating root structures, and that this criterion is satisfied near the air-water interface. The number of aerenchymatous organs including all types was the same in both flooded and non-flooded plants, and we speculate that this number may be pre-determined in some way in plants of this size.
How to Cite: Allaway, W.G., Curran, M., Goulter, P.F.E., Newman, C.A. and Ricketts, M.C., 2010. Long-term flooding stimulates stilit-root production in Avicennia marina. Wetlands Australia, 20(2), pp.41–48. DOI: http://doi.org/10.31646/wa.233
Published on 23 Jan 2010.
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