Influence of environmental factors on stomatal development

Authors


Author for correspondence: Stuart CassonTel: +44 117 9289783Fax: +44 117 3317985Email: stuart.casson@bristol.ac.uk

Abstract

Contents

 Summary1
I.Introduction2
II.Stomatal patterning in leaves2
III.The genetic control of stomatal development4
IV.The cell cycle and stomatal development7
V.Environmental influences on stomatal pattern8
VI.Systemic signals and stomatal development10
VII.Conclusions11
 Acknowledgements12
 References12

Summary

Stomata play a pivotal role in the regulation of gas exchange in flowering plants and are distributed throughout the aerial epidermis. In leaves, the pattern of stomatal distribution is highly variable between species but is regulated by a mechanism that maintains a minimum of one cell spacing between stomata. In Arabidopsis, a number of the genetic components of this mechanism have been identified and include, SDD1, EPF1 and the putative receptors TMM and the ERECTA-gene family. A mitogen-activated protein (MAP) kinase signalling cascade is believed to act downstream of these putative receptors while a number of transcription factors including SPCH, MUTE and FAMA have been identified that control consecutive steps of stomatal development. The environment also has significant effects on stomatal development. In a number of species both light intensity and CO2 concentrations have been shown to influence the frequency at which stomata develop on leaves. Long-distance signalling mechanisms have been implicated in these environmental responses with the conditions sensed by mature leaves determining the stomatal frequency in developing leaves. Thus, changes in the environment appear to act by modulating the developmental and patterning pathways to determine stomatal frequency.

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