Document Detail

Photosynthetic limitation by CO2 diffusion in drought stressed orange leaves on three rootstocks.
MedLine Citation:
PMID:  18373209     Owner:  NLM     Status:  MEDLINE    
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.
Norma de Magalhães Erismann; Eduardo Caruso Machado; Maria Luiza Sant' Anna Tucci
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2008-03-29
Journal Detail:
Title:  Photosynthesis research     Volume:  96     ISSN:  0166-8595     ISO Abbreviation:  Photosyn. Res.     Publication Date:  2008 May 
Date Detail:
Created Date:  2008-04-09     Completed Date:  2008-07-21     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  100954728     Medline TA:  Photosynth Res     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  163-72     Citation Subset:  IM    
Centro de Pesquisa e Desenvolvimento de Ecofisiologia e Biofísica, Instituto Agronômico (IAC), Caixa Postal 28, 13012-970 Campinas, SP, Brasil.
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MeSH Terms
Carbon Dioxide / metabolism*
Citrus sinensis / metabolism*
Photosynthesis / physiology*
Photosystem II Protein Complex / metabolism
Plant Leaves / metabolism*
Reg. No./Substance:
0/Photosystem II Protein Complex; 124-38-9/Carbon Dioxide

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