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Original Research ARTICLE Provisionally accepted The full-text will be published soon. Notify me

Front. Plant Sci. | doi: 10.3389/fpls.2019.01512

Whole irradiated plant leaves showed faster photosynthetic induction than individually irradiated leaves via improved stomatal opening

  • 1The University of Tokyo, Japan
  • 2Department of Biological Sciences, Graduate School of Science, The University of Tokyo, Japan
  • 3RIKEN Center for Sustainable Resource Science (CSRS), Japan

Rapid photosynthetic induction is crucial for plants under fluctuating light conditions in a crop canopy as well as in an understory. Most previous studies have focused on photosynthetic induction responses in a single leaf, whereas the systemic responses of the whole plant have not been considered. In a natural environment, however, both single leaves and whole plants are exposed to sunlight, since the light environment is not uniform even within a given plant. In the present study, we examined whether there is any difference between the photosynthetic induction response of a leaf of a whole irradiated plant (WIP) and an individually irradiated leaf (IIL) in Arabidopsis thaliana to consider photosynthetic induction as the response of a whole plant. We used two methods, the visualization of photosynthesis and direct measurements of gas-exchange and Chl fluorescence, to demonstrate that WIP promoted its photosynthetic induction via improved stomatal opening compared with IIL. Furthermore, using two Arabidopsis knockout mutants of ABA transporter, abcg25 and abcg40, the present study suggests that ABA could be involved in this systemic response for stomatal opening, allowing plants to optimize the use of light energy at minimal cost in plants in a dynamic light environment.

Keywords: Photosynthesis, Photosynthetic induction, Stomatal conductance, Systemic signaling, ABA

Received: 15 Sep 2019; Accepted: 31 Oct 2019.

Copyright: © 2019 Yamori, Shimadzu, Seo and Terashima. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

* Correspondence: Dr. Wataru Yamori, The University of Tokyo, Bunkyō, Japan, wataru.yamori@isas.a.u-tokyo.ac.jp