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Casein kinase II α subunits affect multiple developmental and stress‐responsive pathways in Arabidopsis
Author(s) -
Mulekar Jidnyasa Jayant,
Bu Qingyun,
Chen Fulu,
Huq Enamul
Publication year - 2012
Publication title -
the plant journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.058
H-Index - 269
eISSN - 1365-313X
pISSN - 0960-7412
DOI - 10.1111/j.1365-313x.2011.04794.x
Subject(s) - arabidopsis , mutant , casein kinase 2 , protein subunit , biology , specificity factor , cotyledon , microbiology and biotechnology , gene , wild type , kinase , biochemistry , protein kinase a , gene expression , botany , promoter , cyclin dependent kinase 2
Summary Casein kinase II (formerly known as CK2), a ubiquitous Ser/Thr kinase, plays critical roles in all higher organisms including plants. The CK2 holoenzyme consists of two catalytic α subunits and two regulatory β subunits. The Arabidopsis genome has four α subunit and four β subunit genes, and members of both the α and β subunit families have been shown to be localized in the cytoplasm, nucleus and also in chloroplasts. However, the biological roles of CK2 subunits have not been fully characterized yet. Here we identified T‐DNA insertion mutants in three α subunit genes ( α1 , α2 and α3 ) and made double and triple mutants. The CK2 α1α2α3 triple mutants displayed reduced CK2 activity compared with wild‐type seedlings. Phenotypic characterization showed that CK2 α1α2α3 triple mutants are late flowering under both long‐ and short‐day conditions. Genes encoding floral integrators are differentially regulated in the triple mutant compared with the wild‐type plants. CK2 α1α2α3 triple mutants also displayed reduced hypocotyl growth, smaller cotyledon size and a reduced number of lateral roots compared with wild‐type seedlings under light. Abscisic acid‐induced blockage of seed germination and cotyledon greening is reduced in CK2 α subunit mutants in an additive manner. Moreover, CK2 α subunit mutants are also hyposensitive to a NaCl‐induced blockage of seed germination. Taken together, these data suggest that CK2 α subunits affect diverse developmental and stress responsive pathways in Arabidopsis.