State the physiological effect of auxin and cytokinin
Answers
The primary physiological effect of auxin in plants is to stimulate the elongation of cells in shoot. A very common example of this can be observed in phototropic curvatures where the unilateral light unequally distributes the auxin in the stem tip (i.e., more auxin on shaded side than on illuminated side).
The higher concentration of auxin on the shaded side causes the cells on that side to elongate more rapidly resulting in bending of the stem tip towards the unilateral light. Many theories have been proposed to explain the mechanism of cell elongation due to auxin.
Cytokinin is a plant growth substance, which stimulates cell division. This was isolated by Miller and Skoog in 1954 from Herring fish. Following the discovery of kinetin many other compounds showing similar activity were discovered. These are collectively called cytokinins. The cytokinin found in the zea mays is called zeatin. Cytokinin is also found in the endosperm of coconut. Cytokinin occurs in various seed plants. They are found particularly in embryos, developing fruits and roots. Varying mixtures of auxin and cytokinin influence plant growth and differentiation.
Answer:
Application of auxin to cut epical Trump retards accumulation of cytokinins in literal birds resulting inhibition of bird growth. The ratio of ouxin cytokinin to appears to be one of the key factors involved in apical dominance. Higher ouxin to cytokinin ratio suppresses the growth of lateral buds.