NDLI: Height-related decreases in mesophyll conductance, leaf photosynthesis and compensating adjustments associated with leaf nitrogen concentrations in Pinus densiflora

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Height-related decreases in mesophyll conductance, leaf photosynthesis and compensating adjustments associated with leaf nitrogen concentrations in Pinus densiflora

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Han, Qingmin
Spatial Coverage	Japan
Description	Country affiliation: Japan Author Affiliation: Han Q ( Department of Plant Ecology, Forestry and Forest Products Research Institute (FFPRI), Ibaraki 305-8687, Japan. qhan@ffpri.affrc.go.jp)
Abstract	Hydraulic limitations associated with increasing tree height result in reduced foliar stomatal conductance $(g_{s})$ and light-saturated photosynthesis $(A_{max}).$ However, it is unclear whether the decline in $A_{max}$ is attributable to height-related modifications in foliar nitrogen concentration (N), to mesophyll conductance $(g_{m})$ or to biochemical capacity for photosynthesis (maximum rate of carboxylation, $V_{cmax}).$ Simultaneous measurements of gas exchange and chlorophyll fluorescence were made to determine $g_{m}$ and $V_{cmax}$ in four height classes of Pinus densiflora Sieb. & Zucc. trees. As the average height of growing trees increased from 3.1 to 13.7 m, $g_{m}$ decreased from 0.250 to 0.107 mol $m^{−2}$ $s^{−1},$ and the $CO_{2}$ concentration from the intercellular space $(C_{i})$ to the site of carboxylation $(C_{c})$ decreased by an average of 74 µmol $mol^{−1}.$ Furthermore, $V_{cmax}$ estimated from $C_{c}$ increased from 68.4 to 112.0 µmol $m^{−2}$ $s^{−1}$ with the increase in height, but did not change when it was calculated based on $C_{i}.$ In contrast, $A_{max}$ decreased from 14.17 to 10.73 µmol $m^{−2}$ $s^{−1}.$ Leaf dry mass per unit area (LMA) increased significantly with tree height as well as N on both a dry mass and an area basis. All of these parameters were significantly correlated with tree height. In addition, $g_{m}$ was closely correlated with LMA and $g_{s},$ indicating that increased diffusive resistance for $CO_{2}$ may be the inevitable consequence of morphological adaptation. Foliar N per unit area was positively correlated with $V_{cmax}$ based on $C_{c}$ but negatively with $A_{max},$ suggesting that enhancement of photosynthetic capacity is achieved by allocating more N to foliage in order to minimize the declines in $A_{max}.$ Increases in the N cost associated with carbon gain because of the limited water available to taller trees lead to a trade-off between water use efficiency and photosynthetic nitrogen use efficiency. In conclusion, the height-related decrease in photosynthetic performance appears to result mainly from diffusive resistances rather than biochemical limitations.
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 Pinus Anatomy & Histology Metabolism Biological Transport Carbon Dioxide Chlorophyll Nitrogen 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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Height-related decreases in mesophyll conductance, leaf photosynthesis and compensating adjustments associated with leaf nitrogen concentrations in Pinus densiflora

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