Photosynthetic limitation by CO2 diffusion in drought stressed orange leaves on three rootstocks.
Identifieur interne : 002023 ( Main/Exploration ); précédent : 002022; suivant : 002024Photosynthetic 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 TucciSource :
- Photosynthesis research [ 0166-8595 ] ; 2008.
English descriptors
- KwdEn :
- 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
Affiliations:
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Le document en format XML
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<term>Photosynthesis (physiology)</term>
<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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