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Arabidopsis YAK 1 regulates abscisic acid response and drought resistance
Author(s) -
Kim Dongjin,
Ntui Valentine Otang,
Xiong Liming
Publication year - 2016
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1002/1873-3468.12234
Subject(s) - abscisic acid , arabidopsis , mutant , seedling , abiotic stress , biology , greening , cotyledon , germination , abiotic component , drought tolerance , botany , gene , microbiology and biotechnology , genetics , ecology
Abscisic acid ( ABA ) is an important phytohormone that controls several plant processes such as seed germination, seedling growth, and abiotic stress response. Here, we report that AtYak1 plays an important role in ABA signaling and postgermination growth in Arabidopsis. AtYak1 knockout mutant plants were hyposensitive to ABA inhibition of seed germination, cotyledon greening, seedling growth, and stomatal movement. atyak1‐1 mutant plants display reduced drought stress resistance, as evidenced by water loss rate and survival rate. Molecular genetic analysis revealed that AtYak1 deficiency led to elevated expression of stomatal‐related gene, MYB 60 , and down‐regulation of several stress‐responsive genes. Altogether, these results indicate that AtYak1 plays a role as a positive regulator in ABA ‐mediated drought response in Arabidopsis.