Tobacco aquaporin NtAQP1 is involved in mesophyll conductance to CO2in vivo

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作者：

J Flexas，M Ribas-Carbó，DT Hanson，J Bota，B Otto，J Cifre，N Mcdowell，H Medrano，R Kaldenhoff

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摘要：

SummaryLeaf mesophyll conductance to CO2 (gm) has been recognized to be finite and variable, rapidly adapting to environmental conditions. The physiological basis for fast changes in gm is poorly understood, but current reports suggest the involvement of protein-facilitated CO2 diffusion across cell membranes. A good candidate for this could be the Nicotiana tabacum L. aquaporin NtAQP1, which was shown to increase membrane permeability to CO2 in Xenopus oocytes. The objective of the present work was to evaluate its effect on the in vivo mesophyll conductance to CO2, using plants either deficient in or overexpressing NtAQP1. Antisense plants deficient in NtAQP1 (AS) and NtAQP1 overexpressing tobacco plants (O) were compared with their respective wild-type (WT) genotypes (CAS and CO). Plants grown under optimum conditions showed different photosynthetic rates at saturating light, with a decrease of 13% in AS and an in

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关键词：

aquaporins Nicotiana CO2 permeability photosynthesis leaf conductance

DOI：

10.1111/j.1365-313X.2006.02879.x

被引量：

741

年份：

2006