A subset of cytokinin two-component signaling system plays a role in cold temperature stress response in Arabidopsis.

ABSTRACT: A multistep two-component signaling system is established as a key element of cytokinin signaling in Arabidopsis. Here, we provide evidence for a function of the two-component signaling system in cold stress response in Arabidopsis. Cold significantly induced the expression of a subset of A-type ARR genes and of GUS in Pro(ARR7):GUS transgenic Arabidopsis. AHK2 and AHK3 were found to be primarily involved in mediating cold to express A-type ARRs despite cytokinin deficiency. Cold neither significantly induced AHK2 and AHK3 expression nor altered the cytokinin contents of wild type within the 4 h during which the A-type ARR genes exhibited peak expression in response to cold, indicating that cold might induce ARR expression via the AHK2 and AHK3 proteins without alterations in cytokinin lev

SUBMITTER: Jeon J 

PROVIDER: S-EPMC2906329 | biostudies-literature | 2010 Jul

REPOSITORIES: biostudies-literature