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Updated: Jul 27, 2025
04:32
An Induction System for Clustered Stomata by Sugar Solution Immersion Treatment in Arabidopsis thaliana Seedlings
Published on: February 15, 2019
5.9K
Sugar status in preexisting leaves determines systemic stomatal development within newly developing leaves.
Qin-Xin Bao1, Xin-Rong Mu1, Chen Tong1
1School of Life Science, Jiangsu Normal University, Xuzhou, Jiangsu 221116, People's Republic of China.
Summary
Plant carbohydrate status in mature leaves signals to developing leaves, controlling stomatal formation. The HEXOKINASE1 (HXK1)-EIN3-SUC2 module regulates glucose signaling and sucrose transport, influencing stomatal development via the KIN10-SPCH pathway.
Area of Science:
- Plant Physiology
- Molecular Biology
- Developmental Biology
Background:
- Stomata are crucial pores regulating plant gas exchange and water uptake, influenced by environmental cues.
- The systemic regulation of stomatal development by carbohydrate status in mature leaves remained largely unknown.
- Key regulators like HEXOKINASE1 (HXK1), EIN3, SUC2, KIN10, and SPCH are involved in glucose sensing, ethylene/glucose signaling, sucrose transport, and stomatal development.
Purpose of the Study:
- To elucidate the mechanism by which carbohydrate status in mature leaves influences stomatal formation in developing leaves.
- To investigate the role of the HXK1-EIN3-SUC2 module in mediating systemic carbohydrate signaling for stomatal development.
Main Methods:
- Investigated the interplay between glucose levels, HXK1, EIN3, and SUC2 in mature leaves.
- Analyzed the impact of altered glucose levels on sucrose transport from mature to developing leaves.
- Examined the subsequent effect of sucrose accumulation in developing leaves on stomatal formation via the KIN10-SPCH pathway.
Main Results:
- Demonstrated that the HXK1-EIN3-SUC2 module links leaf glucose status to systemic stomatal development.
- Showed that increased glucose in mature leaves leads to HXK1-dependent reduction of EIN3 and increased SUC2, promoting sucrose transport.
- Confirmed that elevated sucrose in developing leaves stimulates stomatal formation through the KIN10-SPCH module.
Conclusions:
- The HXK1-EIN3-SUC2 module acts as a critical signaling pathway for sensing, amplifying, and relaying carbohydrate status from mature to developing leaves.
- This systemic signaling mechanism precisely controls the extent of stomatal development in new leaves based on the plant's overall carbohydrate status.
- Provides a novel understanding of how resource allocation (sucrose transport) is integrated with developmental processes (stomatal formation) in plants.
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