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Stomatal function, density and pattern, and CO2assimilation in Arabidopsis thaliana tmm1 and sdd1-1 mutants

M. Vráblová, D. Vrábl, M. Hronková, J. Kubásek, J. Šantrůček,

. 2017 ; 19 (5) : 689-701. [pub] 20170611

Language English Country Great Britain

Document type Journal Article

Persistent link   https://www.medvik.cz/link/bmc18010618

Stomata modulate the exchange of water and CO2between plant and atmosphere. Although stomatal density is known to affect CO2diffusion into the leaf and thus photosynthetic rate, the effect of stomatal density and patterning on CO2assimilation 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 CO2assimilation 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 CO2transport.

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