Differences in pigment composition, photosynthetic rates and chlorophyll fluorescence images of sun and shade leaves of four tree species.

Differences in pigment composition, photosynthetic rates and chlorophyll fluorescence images of sun and shade leaves of four tree species. Research Abstract Details 

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Differences in pigment composition, photosynthetic rates and chlorophyll fluorescence images of sun and shade leaves of four tree species. Abstract Text:

Hartmut K Lichtenthaler,Alexander Ac,Michal V Marek, Kalina,Otmar Urban,

The differential pigment composition and photosynthetic activity of sun and shade leaves of deciduous (Acer pseudoplatanus, Fagus sylvatica, Tilia cordata) and coniferous (Abies alba) trees was comparatively determined by studying the photosynthetic rates via CO(2) measurements and also by imaging the Chl fluorescence decrease ratio (R(Fd)), which is an in vivo indicator of the net CO(2) assimilation rates. The thicker sun leaves and needles in all tree species were characterized by a lower specific leaf area, lower water content, higher total chlorophyll (Chl) a+b and total carotenoid (Cars) content per leaf area unit, as well as higher values for the ratio Chl a/b compared to the much thinner shade leaves and needles that possess a higher Chl a+b and Cars content on a dry matter basis and higher values for the weight ratio Chls/Cars. Sun leaves and needles exhibited higher rates of maximum net photosynthetic CO(2) assimilation (P(Nmax)) measured at saturating irradiance associated with higher maximum stomatal conductance for water vapor efflux. The differences in photosynthetic activity between sun and shade leaves and needles could also be sensed via imaging the Chl fluorescence decrease ratio R(Fd), since it linearly correlated to the P(Nmax) rates at saturating irradiance. Chl fluorescence imaging not only provided the possibility to screen the differences in P(N) rates between sun and shade leaves, but in addition permitted detection and quantification of the large gradients in photosynthetic rates across the leaf area existing in sun and shade leaves.

Differences in pigment composition, photosynthetic rates and chlorophyll fluorescence images of sun and shade leaves of four tree species. Publishing Authors By Initials

HK Lichtenthaler,A Ac,MV Marek,J Kalina,O Urban,

For similar plants: trees research abstracts see: plants: trees research

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Differences in pigment composition, photosynthetic rates and chlorophyll fluorescence images of sun and shade leaves of four tree species. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Plant physiology and biochemistry : PPB / Société

VOLUME: 45

Page Numbers: 577-88

Journal Abbreviation: Plant Physiol. Biochem.

ISSN: 0981-9428

DAY: 1

MONTH: 05

YEAR: 2007

Differences in pigment composition, photosynthetic rates and chlorophyll fluorescence images of sun and shade leaves of four tree species. Information

Number of References:

LANGUAGE: eng

NlmUniqueID: 9882449

Differences in pigment composition, photosynthetic rates and chlorophyll fluorescence images of sun and shade leaves of four tree species. Keywords Mesh Terms:

KEYWORDS: Trees

MESH TERMS: genetics

Chemical & Substance for Abstract: Differences in pigment composition, photosynthetic rates and chlorophyll fluorescence images of sun and shade leaves of four tree species. Information

Substance Name: chlorophyll b

Registry Number: 519-62-0

Grant and Affiliation Information for Differences in pigment composition, photosynthetic rates and chlorophyll fluorescence images of sun and shade leaves of four tree species.

AFFILIATION: Botanical Institute (Molecular Biology and Biochemistry of Plants), University of Karlsruhe, Kaiserstrasse 12, D-76133 Karlsruhe, Germany.

Country: France

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MEDLINETA: Plant Physiol Biochem

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