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

Photosynthetic limitations under moderate water deficit were evaluated in 'Valência' orange trees grafted on three different rootstocks, in pots. Net CO₂ assimilation rate (A N), stomatal conductance (g s), and photosystem II (PS II) operating efficiency ( [graphic removed] ) in response t...

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Veröffentlicht in:Photosynthesis research 2008-05, Vol.96 (2), p.163-172
Hauptverfasser: de Magalhães Erismann, Norma, Caruso Machado, Eduardo, Sant' Anna Tucci, Maria Luiza
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creator de Magalhães Erismann, Norma
Caruso Machado, Eduardo
Sant' Anna Tucci, Maria Luiza
description Photosynthetic limitations under moderate water deficit were evaluated in 'Valência' orange trees grafted on three different rootstocks, in pots. Net CO₂ assimilation rate (A N), stomatal conductance (g s), and photosystem II (PS II) operating efficiency ( [graphic removed] ) in response to changing intercellular CO₂ partial pressure (C i) were analyzed under controlled conditions. Drought decreased A N and g s, whereas [graphic removed] remained unchanged. This resulted in a higher ratio between electron transport rate (ETR) and gross CO₂ 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 ( [graphic removed] ) 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 [graphic removed] from ETR/A G ratios measured under water stress. The response of A N to [graphic removed] suggests that the CO₂ diffusional restriction is the main factor that limits photosynthesis in orange leaves under moderate water deficit.
doi_str_mv 10.1007/s11120-008-9297-y
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Net CO₂ assimilation rate (A N), stomatal conductance (g s), and photosystem II (PS II) operating efficiency ( [graphic removed] ) in response to changing intercellular CO₂ partial pressure (C i) were analyzed under controlled conditions. Drought decreased A N and g s, whereas [graphic removed] remained unchanged. This resulted in a higher ratio between electron transport rate (ETR) and gross CO₂ 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 ( [graphic removed] ) 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 [graphic removed] from ETR/A G ratios measured under water stress. 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Net CO₂ assimilation rate (A N), stomatal conductance (g s), and photosystem II (PS II) operating efficiency ( [graphic removed] ) in response to changing intercellular CO₂ partial pressure (C i) were analyzed under controlled conditions. Drought decreased A N and g s, whereas [graphic removed] remained unchanged. This resulted in a higher ratio between electron transport rate (ETR) and gross CO₂ 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 ( [graphic removed] ) 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 [graphic removed] from ETR/A G ratios measured under water stress. The response of A N to [graphic removed] suggests that the CO₂ diffusional restriction is the main factor that limits photosynthesis in orange leaves under moderate water deficit.</abstract><cop>Dordrecht</cop><pub>Dordrecht : Springer Netherlands</pub><pmid>18373209</pmid><doi>10.1007/s11120-008-9297-y</doi><tpages>10</tpages></addata></record>
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subjects Biochemistry
Biomedical and Life Sciences
Carbon dioxide
Carbon Dioxide - metabolism
Chlorophyll
Chloroplasts
Citrus fruits
Citrus sinensis - metabolism
Diffusion
Disasters
Drought
electron transfer
Fluorescence
gas exchange
leaves
Life Sciences
Photosynthesis
Photosynthesis - physiology
photosystem II
Photosystem II Protein Complex - metabolism
Plant Genetics and Genomics
Plant Leaves - metabolism
Plant Physiology
Plant Sciences
Regular Paper
rootstocks
stomatal conductance
trees
water stress
title Photosynthetic limitation by CO₂ diffusion in drought stressed orange leaves on three rootstocks
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