Potassium nutrition, sodium toxicity, and calcium signaling: connections through the CBL-CIPK network

作者：Luan Sheng^*; Lan Wenzhi; Lee Sung Chul

来源：Current Opinion in Plant Biology, 2009, 12(3): 339-346.

DOI：10.1016/j.pbi.2009.05.003

Plant roots take up numerous minerals from the soil. Some minerals (e.g., K( )) are essential nutrients and others (e.g., Na( )) are toxic for plant growth and development. In addition to the absolute level, the balance among the minerals is critical for their physiological functions. For instance, [K( )]/[Na( )] ratio and homeostasis often determine plant growth rate. Either low-K or high-Na in the soil represents a stress condition that severely affects plant life and agricultural production. Earlier observations indicated that higher soil Ca(2 ) improve plants growth under low-K or high-Na condition, implying functional interaction among the three cations. Recent studies have begun to delineate the signaling mechanisms underlying such interactions. Either low-K( ) or high-Na( ) can trigger cellular Ca(2 ) changes that lead to activation of complex signaling networks. One such network consists of Ca(2 ) sensor proteins (e.g., CBLs) interacting with their target kinases (CIPKs). The CBL-CIPK signaling modules interact with and regulate the activity of a number of transporting proteins involved in the uptake and translocation of K( ) and Na( ), maintaining the "balance" of these cations in plants under stress conditions.

• 出版日期2009-6