Journal Article

Acclimation of leaf characteristics of <i>Fagus</i> species to previous-year and current-year solar irradiances

Akira Uemura, Atsushi Ishida, Takashi Nakano, Ichiro Terashima, Hiromi Tanabe and Yoosuke Matsumoto

in Tree Physiology

Volume 20, issue 14, pages 945-951
Published in print August 2000 | ISSN: 0829-318X
Published online August 2000 | e-ISSN: 1758-4469 | DOI: http://dx.doi.org/10.1093/treephys/20.14.945
Acclimation of leaf characteristics of Fagus species to previous-year and current-year solar irradiances

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To examine the effects of different solar irradiances on leaf characteristics at the leaf primordium and expansion stages, we shaded parts of branches in the upper canopies of two adult beech trees, Fagus crenata Blume and Fagus japonica Maxim., for 4 years. The treatments during the leaf primordium and leaf expansion stages, respectively, were: (1) high light and high light (H, control), (2) high light and low light (HL), (3) low light and low light (LL), and (4) low light and high light (LH). Both number of cell layers in palisade tissue and individual leaf area were affected by the previous-year irradiance, whereas cell length of palisade tissue was larger in LH leaves than in LL leaves, suggesting determination by current-year irradiance. Lamina chlorophyll/nitrogen ratio was higher in HL and LL leaves than in LH leaves, suggesting determination by current-year irradiance. Diurnal minimum values of leaf water potential measured under sunlit conditions were lower in H and LH leaves than in HL and LL leaves. Effective osmotic adjustment was found in H and LH leaves, suggesting that leaf water relations were affected by current-year irradiance. Net photosynthetic rate and stomatal conductance measured under sunlight conditions were higher in H and LH leaves than in HL and LL leaves. Thus, effects of current-year irradiance had a greater effect on leaf-area-based daily carbon gain than previous-year irradiance.

Keywords: canopy shading experiment; chlorophyll; Fagus species; light acclimation; nitrogen; photosynthesis; water relations

Journal Article.  0 words. 

Subjects: Plant Sciences and Forestry

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