KNOCKOUT OF ATMKK1 REDUCES ARABIDOPSIS RESPONSE TO 2, 3, 5-TRIIODOBENZOIC ACID IN LEAVES

Abstract

Mitogen activated protein kinase (MAPK) pathways are crucial for plant growth and development. The most commonly identified pathways that AtMKK1 has been connected to are wounding, bacterial pathogen response, cold, drought, salt stress, reactive oxygen species stress, touch, and abscisic acid. There is also evidence that AtMKK1 regulates development. In leaf development, auxin can modulate both cell division and expansion and has a key role in both initiation and elaboration of final morphology of both leaves and vascular networks. Distribution of auxin to different tissues and organs relies on auxin transport systems. In our study, it was found that there was reduced response in atmkk1, the AtMKK1 knockout mutant, to 2,3,5-triiodobenzoic acid, an auxin polar transport inhibitor. Analysis of protein-protein interactions has suggested that AtMKK1 may interact with the downstream AtMPK12, which is a negative regulator of auxin signaling. Our results indicate that AtMKK1 may play a role in leaf development.

Keywords

• Arabidopsis
• auxin
• leaf
• PIN1
• TIBA