Growth inhibitors and growth catalysts

Plants – from germination to aging – depend on and are affected by the presence of catalysts and growth inhibitors (plant “hormones”) that monitor the normal development of the plant, the intercellular communication and processes essential for the proper maintenance of the various plant organelles.

Describe the mechanism of action of catalysts in the following processes (up to half a page to one):With leg length elongation / light dependency – IAA: cellsCentrality – ABA mechanism of action, interactions with – GA: germinating the different sperm partsCytokinins and toxins – their importance in plant genetic engineering.
Find an article from the last 5 years – dealing with proteins involved in auxin’s polar transition in plants (PIN,AUX or other). Describe (up to half a page) the new findings – the article must be mentioned (full reference – including authors, where the article appeared in the newspaper, a year’s volume and pages) on which they were based.