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Stomatal function, density and pattern, and CO 2 assimilation in Arabidopsis thaliana tmm1 and sdd1‐1 mutants
Author(s) -
Vráblová M.,
Vrábl D.,
Hronková M.,
Kubásek J.,
Šantrůček J.
Publication year - 2017
Publication title -
plant biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.871
H-Index - 87
eISSN - 1438-8677
pISSN - 1435-8603
DOI - 10.1111/plb.12577
Subject(s) - stomatal density , stomatal conductance , photosynthesis , biology , arabidopsis thaliana , botany , carbon assimilation , conductance , mutant , gene , physics , biochemistry , condensed matter physics
Stomata modulate the exchange of water and CO 2 between plant and atmosphere. Although stomatal density is known to affect CO 2 diffusion into the leaf and thus photosynthetic rate, the effect of stomatal density and patterning on CO 2 assimilation is not fully understood. We used wild types Col‐0 and C24 and stomatal mutants sdd1‐1 and tmm1 of Arabidopsis thaliana , differing in stomatal density and pattern, to study the effects of these variations on both stomatal and mesophyll conductance and CO 2 assimilation rate. Anatomical parameters of stomata, leaf temperature and carbon isotope discrimination were also assessed. Our results indicate that increased stomatal density enhanced stomatal conductance in sdd1‐1 plants, with no effect on photosynthesis, due to both unchanged photosynthetic capacity and decreased mesophyll conductance. Clustering (abnormal patterning formed by clusters of two or more stomata) and a highly unequal distribution of stomata between the adaxial and abaxial leaf sides in tmm1 mutants also had no effect on photosynthesis. Except at very high stomatal densities, stomatal conductance and water loss were proportional to stomatal density. Stomatal formation in clusters reduced stomatal dynamics and their operational range as well as the efficiency of CO 2 transport.