NDLI: Effects of leaf age and tree size on stomatal and mesophyll limitations to photosynthesis in mountain beech (Nothofagus solandrii var. cliffortiodes)

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Effects of leaf age and tree size on stomatal and mesophyll limitations to photosynthesis in mountain beech (Nothofagus solandrii var. cliffortiodes)

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Effects of leaf age and tree size on stomatal and mesophyll limitations to photosynthesis in mountain beech (Nothofagus solandrii var. cliffortiodes)

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Whitehead, David Barbour, Margaret M. Griffin, Kevin L. Turnbull, Matthew H. Tissue, David T.
Spatial Coverage	New Zealand
Description	Country affiliation: New Zealand Author Affiliation: Whitehead D ( Landcare Research, PO Box 40, Lincoln 7640, New Zealand. whiteheadD@landcareresearch.co.nz)
Abstract	Mesophyll conductance, $g_{m},$ was estimated from measurements of stomatal conductance to carbon dioxide transfer, $g_{s},$ photosynthesis, A, and chlorophyll fluorescence for Year 0 (current-year) and Year 1 (1-year-old) fully sunlit leaves from short (2 m tall, 10-year-old) and tall (15 m tall, 120-year-old) Nothofagus solandrii var. cliffortiodes trees growing in adjacent stands. Rates of photosynthesis at saturating irradiance and ambient $CO_{2}$ partial pressure, $A_{satQ},$ were 25% lower and maximum rates of carboxylation, $V_{cmax},$ were 44% lower in Year 1 leaves compared with Year 0 leaves across both tree sizes. Although $g_{s}$ and $g_{m}$ were not significantly different between Year 0 and Year 1 leaves and $g_{s}$ was not significantly different between tree heights, $g_{m}$ was significantly (19%) lower for leaves on tall trees compared with leaves on short trees. Overall, $V_{cmax}$ was 60% higher when expressed on the basis of $CO_{2}$ partial pressure at the chloroplasts, $C_{c},$ compared with $V_{cmax}$ on the basis of intercellular $CO_{2}$ partial pressure, $C_{i},$ but this varied with leaf age and tree size. To interpret the relative stomatal and mesophyll limitations to photosynthesis, we used a model of carbon isotopic composition for whole leaves incorporating $g_{m}$ effects to generate a surface of ‘operating values’ of A over the growing season for all leaf classes. Our analysis showed that A was slightly higher for leaves on short compared with tall trees, but lower $g_{m}$ apparently reduced actual A substantially compared with $A_{satQ}.$ Our findings showed that lower rates of photosynthesis in Year 1 leaves compared with Year 0 leaves were attributable more to increased biochemical limitation to photosynthesis in Year 1 leaves than differences in $g_{m}.$ However, lower A in leaves on tall trees compared with those on short trees could be attributed in part to lower $g_{m}$ and higher stomatal, $L_{s},$ and mesophyll, $L_{m},$ limitations to photosynthesis, consistent with steeper hydraulic gradients in tall trees.
File Format	HTM / HTML
ISSN	0829318X
e-ISSN	17584469
Journal	Tree Physiology
Issue Number	9
Volume Number	31
Language	English
Publisher	Oxford University Press
Publisher Date	2011-09-01
Publisher Place	Canada
Access Restriction	Open
Subject Keyword	Discipline Physiology Fagus Anatomy & Histology Metabolism Biological Transport Carbon Dioxide Chlorophyll New Zealand Photosynthesis Plant Stomata Plant Transpiration Research Support, Non-u.s. Gov't
Content Type	Text
Resource Type	Article
Subject	Physiology Plant Science

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Effects of leaf age and tree size on stomatal and mesophyll limitations to photosynthesis in mountain beech (Nothofagus solandrii var. cliffortiodes)

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