Structural and Functional Insights into the Role of Guard Cell Ion Channels in Abiotic Stress-Induced Stomatal Closure

Plants

Hamdy Kashtoh¹  Kwang-Hyun Baek¹ 

[1] Department of Biotechnology, Yeungnam University, Gyeongsan 38541, Gyeongbuk, Korea;

关键词: guard cell;    abiotic stress;    KAT1;    SLAC/SLAH;    abscisic acid signaling;    kinases;   

DOI  :  10.3390/plants10122774

来源: DOAJ

【 摘 要 】

A stomatal pore is formed by a pair of specialized guard cells and serves as a major gateway for water transpiration and atmospheric CO₂ influx for photosynthesis in plants. These pores must be tightly controlled, as inadequate CO₂ intake and excessive water loss are devastating for plants. When the plants are exposed to extreme weather conditions such as high CO₂ levels, O₃, low air humidity, and drought, the turgor pressure of the guard cells exhibits an appropriate response against these stresses, which leads to stomatal closure. This phenomenon involves a complex network of ion channels and their regulation. It is well-established that the turgor pressure of guard cells is regulated by ions transportation across the membrane, such as anions and potassium ions. In this review, the guard cell ion channels are discussed, highlighting the structure and functions of key ion channels; the SLAC1 anion channel and KAT1 potassium channel, and their regulatory components, emphasizing their significance in guard cell response to various stimuli.

【 授权许可】

Unknown