Abstract
MORE AXILLARY GROWTH 2 (MAX2) is an F-box protein, containing leucine-rich repeats. It is a common regulator in signalling pathways of both karrikin and strigolactone, and has several homologs such as MAX1, MAX3, and MAX4, which play a key role in the biosynthesis of strigolactone. It also interacts with various receptors and repressors of karrikin and strigolactone. Karrikins are a group of plant growth regulators found in the smoke of burning plant material and had the ability to stimulate seed germination, whereas strigolactone is a newly discovered plant hormone that regulates shoot and root branching and plays a vital role in hypocotyl growth and photomorphogenesis; strigolactone also helps in establishing the symbiosis between root and arbuscular mycorrhizal fungi regarding symbiosis. MAX2 protein also acts against drought, salt, and osmotic stresses. It interacts with various phytohormones in order to regulate seed germination as well as shoot and root branching. This review discusses about the relationship of MAX2 protein with other proteins and repressors during signalling pathways of karrikin and strigolactone and their antagonistic effects on seed and plant's life.
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