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Photosynthetic limitation by CO2 diffusion in drought stressed orange leaves on three rootstocks.

Identifieur interne : 002023 ( Main/Curation ); précédent : 002022; suivant : 002024

Photosynthetic limitation by CO2 diffusion in drought stressed orange leaves on three rootstocks.

Auteurs : Norma De Magalhães Erismann [Brésil] ; Eduardo Caruso Machado ; Maria Luiza Sant' Anna Tucci

Source :

Photosynthesis research [ 0166-8595 ] ; 2008.

RBID : pubmed:18373209

English descriptors

KwdEn :
- Carbon Dioxide (metabolism), Citrus sinensis (metabolism), Diffusion, Disasters, Photosynthesis (physiology), Photosystem II Protein Complex (metabolism), Plant Leaves (metabolism).
MESH :
- chemical , metabolism : Carbon Dioxide, Photosystem II Protein Complex.
- metabolism : Citrus sinensis, Plant Leaves.
- physiology : Photosynthesis.
- Diffusion, Disasters.

Abstract

Photosynthetic limitations under moderate water deficit were evaluated in 'Valência' orange trees grafted on three different rootstocks, in pots. Net CO(2) assimilation rate (A (N)), stomatal conductance (g (s)), and photosystem II (PS II) operating efficiency (F'(q)/F'(m)) in response to changing intercellular CO(2 ) partial pressure (C (i)) were analyzed under controlled conditions. Drought decreased A (N) and g (s), whereas F'(q)/F'(m) remained unchanged. This resulted in a higher ratio between electron transport rate (ETR) and gross CO(2) assimilation rate (A (G)). Since the comparison of A (N)-C (i) gas exchange curves can lead to incorrect conclusions, a normalization of C (i) values (C(i)(f)) of stressed leaves was applied. Then, the relationship established for irrigated trees between the ETR/A (G) ratio and C (i) was used to estimate the C(i)(f) from ETR/A (G) ratios measured under water stress. The response of A (N) to C(i)(f) suggests that the CO(2) diffusional restriction is the main factor that limits photosynthesis in orange leaves under moderate water deficit.

DOI: 10.1007/s11120-008-9297-y
PubMed: 18373209

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Le document en format XML

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<author><name sortKey="De Magalhaes Erismann, Norma" sort="De Magalhaes Erismann, Norma" uniqKey="De Magalhaes Erismann N" first="Norma" last="De Magalhães Erismann">Norma De Magalhães Erismann</name>
<affiliation wicri:level="2"><nlm:affiliation>Centro de Pesquisa e Desenvolvimento de Ecofisiologia e Biofísica, Instituto Agronômico (IAC), Caixa Postal 28, 13012-970 Campinas, SP, Brasil. normaeri@iac.sp.gov.br</nlm:affiliation>
<country xml:lang="fr">Brésil</country>
<wicri:regionArea>Centro de Pesquisa e Desenvolvimento de Ecofisiologia e Biofísica, Instituto Agronômico (IAC), Caixa Postal 28, 13012-970 Campinas, SP</wicri:regionArea>
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<author><name sortKey="Caruso Machado, Eduardo" sort="Caruso Machado, Eduardo" uniqKey="Caruso Machado E" first="Eduardo" last="Caruso Machado">Eduardo Caruso Machado</name>
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<author><name sortKey="Sant Anna Tucci, Maria Luiza" sort="Sant Anna Tucci, Maria Luiza" uniqKey="Sant Anna Tucci M" first="Maria Luiza" last="Sant' Anna Tucci">Maria Luiza Sant' Anna Tucci</name>
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<author><name sortKey="Sant Anna Tucci, Maria Luiza" sort="Sant Anna Tucci, Maria Luiza" uniqKey="Sant Anna Tucci M" first="Maria Luiza" last="Sant' Anna Tucci">Maria Luiza Sant' Anna Tucci</name>
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<series><title level="j">Photosynthesis research</title>
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<term>Photosystem II Protein Complex (metabolism)</term>
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<front><div type="abstract" xml:lang="en">Photosynthetic limitations under moderate water deficit were evaluated in 'Valência' orange trees grafted on three different rootstocks, in pots. Net CO(2) assimilation rate (A (N)), stomatal conductance (g (s)), and photosystem II (PS II) operating efficiency (F'(q)/F'(m)) in response to changing intercellular CO(2 ) partial pressure (C (i)) were analyzed under controlled conditions. Drought decreased A (N) and g (s), whereas F'(q)/F'(m) remained unchanged. This resulted in a higher ratio between electron transport rate (ETR) and gross CO(2) assimilation rate (A (G)). Since the comparison of A (N)-C (i) gas exchange curves can lead to incorrect conclusions, a normalization of C (i) values (C(i)(f)) of stressed leaves was applied. Then, the relationship established for irrigated trees between the ETR/A (G) ratio and C (i) was used to estimate the C(i)(f) from ETR/A (G) ratios measured under water stress. The response of A (N) to C(i)(f) suggests that the CO(2) diffusional restriction is the main factor that limits photosynthesis in orange leaves under moderate water deficit.</div>
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Photosynthetic limitation by CO2 diffusion in drought stressed orange leaves on three rootstocks.

Photosynthetic limitation by CO2 diffusion in drought stressed orange leaves on three rootstocks.

Source :

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Links to Exploration step

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri

Pour générer des pages wiki