Abstract
Hormones are chemical messengers which act at target sites to regulate rates and amounts of growth of cells in tissues of roots, stems, leaves, buds, flowers, and fruits. In this chapter, we shall focus on the roles that hormones play in the orientation of growth of plant organs, particularly of roots and shoots. The basic growth-orienting processes that we shall discuss include phototropism—the orientation of shoots toward unilateral light sources; gravitropism—the orientation of roots downwards and of shoots upwards in response to gravistimulation (placement of plants horizontally); and thigmotropism—the change in orientation of growth in stems from one of rapid elongation to one of repressed elongation and promoted lateral expansion as a result of mechanical perturbation.
Published Version
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