4.7 Article

Stomatal Responses to Light, CO2, and Mesophyll Tissue in Vicia faba and Kalanchoe fedtschenkoi

期刊

FRONTIERS IN PLANT SCIENCE
卷 12, 期 -, 页码 -

出版社

FRONTIERS MEDIA SA
DOI: 10.3389/fpls.2021.740534

关键词

stomata; CAM; mesophyll; Vicia faba; Kalanchoe fedtschenkoi; conductance; stomatal dynamics

资金

  1. Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq) [239228/2012-0]
  2. BBSRC through the BBSRC IWYP programme [BB/S005080/1]
  3. BBSRC through the Global Challenges Research Fund as part of TIGR2ESS: Transforming India's Green Revolution by Research and Empowerment for Sustainable food supplies [BB/P027970/1]
  4. U.S. Department of Energy (DOE) Office of Science, Genomic Science Program [DE-SC0008834]
  5. Biotechnology and Biological Sciences Research Council, U.K. (BBSRC) [BB/F009313/1]
  6. BBSRC [BB/S005080/1, BB/F009313/1, BB/P027970/1] Funding Source: UKRI

向作者/读者索取更多资源

The stomatal responses to light intensity and CO2 concentration were found to differ between CAM and C-3 species, with CAM stomata showing unique behaviors in response to darkness and C-3 signals. Guard cell metabolism and mesophyll signals were identified as key factors influencing stomatal responses in both CAM and C-3 plants.
The responses of stomatal aperture to light intensity and CO2 concentration were studied in both Vicia faba (C-3) and Kalanchoe fedtschenkoi (Crassulacean acid metabolism; CAM), in material sampled from both light and dark periods. Direct comparison was made between intact leaf segments, epidermises grafted onto exposed mesophyll, and isolated epidermal peels, including transplantations between species and between diel periods. We reported the stomatal opening in response to darkness in isolated CAM peels from the light period, but not from the dark. Furthermore, we showed that C-3 mesophyll has stimulated CAM stomata in transplanted peels to behave as C-3 in response to light and CO2. By using peels and mesophyll from plants sampled in the dark and the light period, we provided clear evidence that CAM stomata behaved differently from C-3. This might be linked to stored metabolites/ions and signalling pathway components within the guard cells, and/or a mesophyll-derived signal. Overall, our results provided evidence for both the involvement of guard cell metabolism and mesophyll signals in stomatal responses in both C-3 and CAM species.

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