A Novel Role for Arabidopsis CBL1 in Affecting Plant Responses to Glucose and Gibberellin during Germination and Seedling Development

作者：Li, Zhi-Yong; Xu, Zhao-Shi^*; Chen, Yang; He, Guang-Yuan; Yang, Guang-Xiao; Chen, Ming; Li, Lian-Cheng; Ma, You-Zhi

来源：PLos One, 2013, 8(2): e56412.

DOI：10.1371/journal.pone.0056412

• SUCROSE-SPECIFIC INDUCTION
• SUGAR SIGNAL-TRANSDUCTION
• GENE-EXPRESSION
• ABSCISIC-ACID
• CALCIUM SENSORS
• PROTEIN-KINASE
• BETA-AMYLASE
• BINDING
• CA2+
• ABA

Glucose and phytohormones such as abscisic acid (ABA), ethylene, and gibberellin (GA) coordinately regulate germination and seedling development. However, there is still inadequate evidence to link their molecular roles in affecting plant responses. Calcium acts as a second messenger in a diverse range of signal transduction pathways. As calcium sensors unique to plants, calcineurin B-like (CBL) proteins are well known to modulate abiotic stress responses. In this study, it was found that CBL1 was induced by glucose in Arabidopsis. Loss-of-function mutant cbl1 exhibited hypersensitivity to glucose and paclobutrazol, a GA biosynthetic inhibitor. Several sugar-responsive and GA biosynthetic gene expressions were altered in the cbl1 mutant. CBL1 protein physically interacted with AKIN beta 1, the regulatory beta subunit of the SnRK1 complex which has a central role in sugar signaling. Our results indicate a novel role for CBL1 in modulating responses to glucose and GA signals.

• 出版日期2013-2-20
• 单位中国农业科学院; 华中科技大学