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The mechanism of sugar export from long conifer needles.
Liesche, Johannes; Vincent, Christopher; Han, Xiaoyu; Zwieniecki, Maciej; Schulz, Alexander; Gao, Chen; Bravard, Rodrigue; Marker, Sean; Bohr, Tomas.
Afiliação
  • Liesche J; College of Life Sciences & Biomass Energy Center for Arid and Semi-arid Lands, Northwest A&F University, Taicheng Road 3, Yangling, 712100, China.
  • Vincent C; Cluster of Excellence on Plant Sciences (CEPLAS), Heinrich-Heine-Universität Düsseldorf, Universitätsstraße 1, Düsseldorf, 40225, Germany.
  • Han X; Department of Horticultural Sciences, University of Florida, 700 Experiment Station Road, Lake Alfred, FL, 33850, USA.
  • Zwieniecki M; College of Life Sciences & Biomass Energy Center for Arid and Semi-arid Lands, Northwest A&F University, Taicheng Road 3, Yangling, 712100, China.
  • Schulz A; Department of Plant Sciences, University of California, Davis One Shields Avenue, Davis, CA, 95616, USA.
  • Gao C; Department of Plant and Environmental Sciences, University of Copenhagen, Thorvaldsensvej 40, Frederiksberg, 1871, Denmark.
  • Bravard R; Department of Plant and Environmental Sciences, University of Copenhagen, Thorvaldsensvej 40, Frederiksberg, 1871, Denmark.
  • Marker S; Department of Physics, Technical University of Denmark, Kgs. Lyngby, DK-2800, Denmark.
  • Bohr T; Department of Physics, Technical University of Denmark, Kgs. Lyngby, DK-2800, Denmark.
New Phytol ; 230(5): 1911-1924, 2021 06.
Article em En | MEDLINE | ID: mdl-33638181
ABSTRACT
The green leaves of plants are optimised for carbon fixation and the production of sugars, which are used as central units of carbon and energy throughout the plant. However, there are physical limits to this optimisation that remain insufficiently understood. Here, quantitative anatomical analysis combined with mathematical modelling and sugar transport rate measurements were used to determine how effectively sugars are exported from the needle-shaped leaves of conifers in relation to leaf length. Mathematical modelling indicated that phloem anatomy constrains sugar export in long needles. However, we identified two mechanisms by which this constraint is overcome, even in needles longer than 20 cm (1) the grouping of transport conduits, and (2) a shift in the diurnal rhythm of sugar metabolism and export in needle tips. The efficiency of sugar transport in the phloem can have a significant influence on leaf function. The constraints on sugar export described here for conifer needles are likely to also be relevant in other groups of plants, such as grasses and angiosperm trees.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Traqueófitas Idioma: En Revista: New Phytol Assunto da revista: BOTANICA Ano de publicação: 2021 Tipo de documento: Article País de afiliação: China

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Traqueófitas Idioma: En Revista: New Phytol Assunto da revista: BOTANICA Ano de publicação: 2021 Tipo de documento: Article País de afiliação: China