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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.; Ball, M.C. (2012). Light-dependent maintenance of hydraulic function in mangrove branches: do xylary chloroplasts play a role in embolism repair? New Phytol. 195(1): 40-46. dx.doi.org/10.1111/j.1469-8137.2012.04187.x
In: New Phytologist. Wiley-Blackwell: Oxford. ISSN 0028-646X, more
Peer reviewed article  

Available in  Authors 
    VLIZ: Open Repository 279177 [ OMA ]

Author keywords
    branch photosynthesis; embolism repair; hydraulic conductivity;mangrove; xylary chloroplasts

Authors  Top 
  • Schmitz, N., more
  • Egerton, J.J.G.
  • Lovelock, C.E.
  • Ball, M.C.

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.

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