Light-dependent maintenance of hydraulic function in mangrove branches: do xylary chloroplasts play a role in embolism repair?

Schmitz, N., Egerton, J.J.G., Lovelock, C.E. and Ball, M.C. (2012) Light-dependent maintenance of hydraulic function in mangrove branches: do xylary chloroplasts play a role in embolism repair?. New Phytologist, 195 1: 40-46. doi:10.1111/j.1469-8137.2012.04187.x


Author Schmitz, N.
Egerton, J.J.G.
Lovelock, C.E.
Ball, M.C.
Title Light-dependent maintenance of hydraulic function in mangrove branches: do xylary chloroplasts play a role in embolism repair?
Journal name New Phytologist   Check publisher's open access policy
ISSN 0028-646X
1469-8137
Publication date 2012-07
Sub-type Article (original research)
DOI 10.1111/j.1469-8137.2012.04187.x
Volume 195
Issue 1
Start page 40
End page 46
Total pages 7
Place of publication Oxford, United Kingdom
Publisher Wiley-Blackwell Publishing
Collection year 2013
Language eng
Abstract To clarify the role of branch photosynthesis in tree functioning, the presence and function of chloroplasts in branch xylem tissue were studied in a diverse range of mangrove species growing in Australia. • The presence of xylary chloroplasts was observed via chlorophyll fluorescence of transverse sections. Paired, attached branches were selected to study the effects of covering branches with aluminium foil on the gas exchange characteristics of leaves and the hydraulic conductivity of branches. • Xylary chloroplasts occurred in all species, but were differently distributed among living cell types in the xylem. Covering stems altered the gas exchange characteristics of leaves, such that water-use efficiency was greater in exposed leaves of covered than of uncovered branches. • Leaf-specific hydraulic conductivity of stems was lower in covered than in uncovered branches, implicating stem photosynthesis in the maintenance of hydraulic function. Given their proximity to xylem vessels, we suggest that xylary chloroplasts may play a role in light-dependent repair of embolized xylem vessels.
Keyword Branch photosynthesis
Embolism repair
Hydraulic conductivity
Mangrove
Xylary chloroplasts
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Article first published online: 17 MAY 2012.

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2013 Collection
School of Biological Sciences Publications
 
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