The physiological mechanisms by which the clock might regulate stomatal movements and the benefits that circadian regulation of stomatal behaviour could confer to the plant

Circadian rhythms in stomata: physiological and molecular aspects

by Hubbard K. E., Webb A. A. R. (2015)

  • Katharine E. Hubbard,
  • Alex A. R. Webb,

Department of Plant Sciences, University of Cambridge, Cambridge, UK

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In S. Mancuso, S. Shabala, eds, Rhythms in Plants. Springer International Publishing, Cham, Switzerland, 231–255 – https://doi.org/10.1007/978-3-319-20517-5_9

https://link.springer.com/chapter/10.1007/978-3-319-20517-5_9#citeas

Abstract

Stomata are the major route of gas exchange between the atmosphere and the leaf interior. The size of the stomatal pore is controlled by the movements of the stomatal guard cells. The guard cells close the stomatal pore to conserve water during stress. In more favourable conditions, the stomatal movements optimise CO2 uptake whilst minimising water loss. The movements of stomata are controlled by an extensive network of signalling pathways responding to diverse stimuli. One of the regulators of stomata is the circadian clock. We discuss the physiological mechanisms by which the clock might regulate stomatal movements and the benefits that circadian regulation of stomatal behaviour could confer to the plant.

The roles of CATALASE2 in ABA signaling in stomatal guard cells

by Jannat R., Uraji M., Morofuji M., Hossain M. A., Islam M. M., Nakamura Y., Mori I. C., Murata Y. (2011)

Rayhanur Jannat, Bangabandhu Sheikh Mujibur Rahman Agricultural University

Misugi Uraji, Miho Morofuji, Mohammad Muzahidul Islam,

Mohammad Anowar Hossain, Bangladesh Agricultural University

Yoshimasa Nakamura, Izumi Mori, Yoshiyuki Murata, Okayama University

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In Bioscience, Biotechnology and Biochemistry 75(10): 2034-2036 – DOI: 10.1271/bbb.110344 –

https://www.researchgate.net/publication/51699067_The_roles_of_CATALASE2_in_abscisic_acid_signaling_in_Arabidopsis_guard_cells

Abstract

We investigated the roles of catalase (CAT) in abscisic acid (ABA)-induced stomatal closure using a cat2 mutant and an inhibitor of CAT, 3-aminotriazole (AT).

Constitutive reactive oxygen species (ROS) accumulation due to the CAT2 mutation and AT treatment did not affect stomatal aperture in the absence of ABA, whereas ABA-induced stomatal closure, ROS production, and [Ca(2+)](cyt) oscillation were enhanced.