| Photosynthetic limitation by CO2 diffusion in drought stressed orange leaves on three rootstocks. | |
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MedLine Citation:
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PMID: 18373209 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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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. |
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Authors:
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Norma de Magalhães Erismann; Eduardo Caruso Machado; Maria Luiza Sant' Anna Tucci |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2008-03-29 |
Journal Detail:
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Title: Photosynthesis research Volume: 96 ISSN: 0166-8595 ISO Abbreviation: Photosyn. Res. Publication Date: 2008 May |
Date Detail:
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Created Date: 2008-04-09 Completed Date: 2008-07-21 Revised Date: 2008-11-21 |
Medline Journal Info:
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Nlm Unique ID: 100954728 Medline TA: Photosynth Res Country: Netherlands |
Other Details:
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Languages: eng Pagination: 163-72 Citation Subset: IM |
Affiliation:
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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 |
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| MeSH Terms | |
Descriptor/Qualifier:
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Carbon Dioxide
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metabolism* Citrus sinensis / metabolism* Diffusion Disasters* Photosynthesis / physiology* Photosystem II Protein Complex / metabolism Plant Leaves / metabolism* |
| Chemical | |
Reg. No./Substance:
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0/Photosystem II Protein Complex; 124-38-9/Carbon Dioxide |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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