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Functional Plant Biology Functional Plant Biology Society
Plant function and evolutionary biology
RESEARCH ARTICLE

Confirmation of mesophyll signals controlling stomatal responses by a newly devised transplanting method

Takashi Fujita A C , Ko Noguchi A B , Hiroshi Ozaki B and Ichiro Terashima https://orcid.org/0000-0001-7680-9867 A D
+ Author Affiliations
- Author Affiliations

A Department of Biological Sciences, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan.

B School of Life Sciences, Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo, 192-0392, Japan.

C Present address: Yodosha, Co. LTD, 2-5-1 Kandaogawamachi, Chiyoda-ku, Tokyo, 101-0052, Japan.

D Corresponding author. Email: itera@bs.s.u-tokyo.ac.jp

Functional Plant Biology 46(5) 467-481 https://doi.org/10.1071/FP18250
Submitted: 22 May 2018  Accepted: 22 January 2019   Published: 4 March 2019

Abstract

There are opposing views on whether the responses of stomata to environmental stimuli are all autonomous reactions of stomatal guard cells or whether mesophyll is involved in these responses. Transplanting isolated epidermis onto mesophyll is a potent methodology for examining the roles of mesophyll-derived signals in stomatal responses. Here we report on development of a new transplanting method. Leaf segments of Commelina communis L. were pretreated in the light or dark at 10, 39 or 70 Pa ambient CO2 for 1 h. Then the abaxial epidermises were removed and the epidermal strips prepared from the other leaves kept in the dark at 39 Pa CO2, were transplanted onto the mesophyll. After illumination of the transplants for 1 h at 39 Pa CO2, stomatal apertures were measured. We also examined the molecular sizes of the mesophyll signals by inserting the dialysis membrane permeable to molecules smaller than 100–500 Da or 500–1000 Da between the epidermis and mesophyll. Mesophyll pretreatments in the light at low CO2 partial pressures accelerated stomatal opening in the transplanted epidermal strips, whereas pretreatments at 70 Pa CO2 suppressed stomatal opening. Insertion of these dialysis membranes did not suppress stomatal opening significantly at 10 Pa CO2 in the light, whereas insertion of the 100–500 Da membrane decelerated stomatal closure at high CO2. It is probable that the mesophyll signals inducing stomatal opening at low CO2 in the light would permeate both membranes, and that those inducing stomatal closure at high CO2 would not permeate the 100–500 Da membrane. Possible signal compounds are discussed.

Additional keywords: apoplast, Commelina communis, epidermis, mesophyll, photosynthesis, signalling, stomata.


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