Optimization of stomatal regulation that enables both high CO2 absorption and drought tolarance

About this project

Japan Grant Number
JP18K06294
Funding Program
Grants-in-Aid for Scientific Research
Funding organization
Japan Society for the Promotion of Science
Project/Area Number
18K06294
Research Category
Grant-in-Aid for Scientific Research (C)
Allocation Type
  • Multi-year Fund
Review Section / Research Field
  • Basic Section 44030:Plant molecular biology and physiology-related
Research Institution
  • Kyushu University
Project Period (FY)
2018-04-01 〜 2022-03-31
Project Status
Completed
Budget Amount*help
4,290,000 Yen (Direct Cost: 3,300,000 Yen Indirect Cost: 990,000 Yen)

Research Abstract

To elucidate the regulatory mechanism of the balance between CO2 absorption and water transpiration through stomatal closure, we structurally modified rice SLAC1 protein, a key factor in the regulation of stomatal closure, by homologous recombination-mediated genome editing. We succeeded in introducing two amino acid substitutions (Y256F/Y473F) on the SLAC1 gene that disrupt the candidate CO2 signal receiving site. Gas exchange measurement exhibited that in the SLAC1-modified plants, elevated CO2-induced stomatal closure was significantly reduced. By contrast, ABA-induced stomatal closure remained unaffected. These results indicate that stomatal CO2 response can be artificially controlled by modification of the SLAC1 structure.

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