Inositol(1,4,5)trisphosphate production in plant cells: an early response to salinity and hyperosmotic stress

FEBS Letters

Watkins, Peter A.C¹  Drøbak, Bjørn K¹ 

[1] Department of Cell Biology, John Innes Centre, Norwich Research Park, Colney Lane, Norwich NR4 7UH, UK

关键词: Inositol(1;    4;    5)trisphosphate;    Calcium;    Phospholipase C;    Salt stress;    Osmotic stress;    Higher plant;    Ins(1;    4;    5)P3;    inositol(1;    4;    5)trisphosphate;    PtdIns(4;    5)P2;    phosphatidylinositol(4;    5)bisphosphate;    PI-PLC;    phosphoinositide-specific phospholipase C;   

DOI  :  10.1016/S0014-5793(00)01941-4

学科分类：生物化学/生物物理

来源: John Wiley & Sons Ltd.

【 摘 要 】

Salinity and hyperosmotic stress are environmental factors that severely affect the growth and development of plants. Adaptation to these stresses is known to be a complex multistep process, but a rise in cytoplasmic Ca²⁺ and increased polyphosphoinositide turnover have now been identified as being amongst the early events leading to the development of tolerance. To determine whether a causal link exists between these two events we have investigated the effects of several salts and osmotic agents on levels of inositol(1,4,5)trisphosphate (Ins(1,4,5)P₃) in plant cells. Our data show that salts as well as osmotic agents induce a rapid and up to 15-fold increase in cellular Ins(1,4,5)P₃ levels. The increase in Ins(1,4,5)P₃ occurs in a dose-dependent manner and levels remain elevated for at least 10 min. These data indicate that increased Ins(1,4,5)P₃ production is a common response to salt and hyperosmotic stresses in plants and that it may play an important role in the processes leading to stress tolerance.

【 授权许可】

Unknown