期刊
TREE PHYSIOLOGY
卷 36, 期 3, 页码 300-310出版社
OXFORD UNIV PRESS
DOI: 10.1093/treephys/tpv114
关键词
cell wall; chloroplast thickness; forest understory
类别
资金
- Ministerio de Ciencia e Innovacion, Spain [AGL2009-07999, BFU2011-23294]
- Gobierno de Aragon [H38]
- DOC-INIA - Spanish National Institute for Agriculture and Food Research and Technology (INIA)
- European Social Fund (ESF)
Leaves growing in the forest understory usually present a decreased mesophyll conductance (g(m)) and photosynthetic capacity. The role of leaf anatomy in determining the variability in g(m) among species is known, but there is a lack of information on how the acclimation of g(m) to shade conditions is driven by changes in leaf anatomy. Within this context, we demonstrated that Abies pinsapo Boiss. experienced profound modifications in needle anatomy to drastic changes in light availability that ultimately led to differential photosynthetic performance between trees grown in the open field and in the forest understory. In contrast to A. pinsapo, its congeneric Abies alba Mill. did not show differences either in needle anatomy or in photosynthetic parameters between trees grown in the open field and in the forest understory. The increased g(m) values found in trees of A. pinsapo grown in the open field can be explained by occurrence of stomata at both needle sides (amphistomatous needles), increased chloroplast surface area exposed to intercellular airspace, decreased cell wall thickness and, especially, decreased chloroplast thickness. To the best of our knowledge, the role of such drastic changes in ultrastructural needle anatomy in explaining the response of g(m) to the light environment has not been demonstrated in field conditions.
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