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Characterisation of xylem conduits and their possible role in limiting the vase life of cut <i>Acacia holosericea</i> (Mimosaceae) foliage stems

Damunupola, J. W., Ratnayake, K., Joyce, D. C. and Irving, D. E. (2011) Characterisation of xylem conduits and their possible role in limiting the vase life of cut <i>Acacia holosericea</i> (Mimosaceae) foliage stems. Functional Plant Biology, 38 (7). pp. 614-623.

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Article Link(s): https://doi.org/10.1071/FP11068

Publisher URL: http://www.publish.csiro.au/paper/FP11068

Abstract

Early desiccation limits the vase life of Acacia cut flowers and foliage and may be attributable to poor hydraulic conductivity (Kh) of the cut stems. Acacia holosericea A.Cunn. ex G.Don has been adopted as the test species to investigate the postharvest water relations of the genus Acacia. To understand potential constraints on Kh, xylem conduits in cut A. holosericea stems were anatomically characterised by light and scanning and transmission electron microscopy. Vessels with simple perforation plates and tracheids were the principal water conducting cells. Bordered vestured intervessel pits were present in xylem vessel elements. The majority of conduits (89%) were short at 1–5 cm long. Only 2% were 15–16 cm in length. Mean xylem conduit diameter was 77 ± 0.9 µm and the diameter profile showed a normal distribution, with 29% of diameters in the range of 70–80 µm. Simple perforation plates can offer relatively low resistance to water flow. On the other hand, bordered vestured pits and short xylem conduits can confer comparatively high resistance to water flow. Overall, the presence of bordered vestured pits, together with a high proportion of short xylem conduits and high stomatal densities (232 ± 2 mm–2) on unifacial phyllodes, could contribute to early dehydration of A. holosericea cut foliage stems standing in vase water. Further research will relate these anatomical features with changes in Kh and transpiration of cut foliage stems.

Item Type:Article
Keywords:hydraulic resistance, longevity, stomatal distribution, velvet leaf wattle, water uptake.
Subjects:Plant culture > Flowers and flower culture. Ornamental plants
Plant culture > Flowers and flower culture. Ornamental plants > Marketing. Cut flower industry. Florists
Plant culture > Flowers and flower culture. Ornamental plants > Preservation and reproduction of flowers, fruits, etc
Deposited On:22 Mar 2019 04:57
Last Modified:22 Mar 2019 04:57

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