Garay-Arroyo A, de la Paz SM, García-Ponce B, Álvarez-Buylla ER, Gutiérrez C

Language: Spanish
References: 36
Page: 13-22
PDF size: 735.71 Kb.

ABSTRACT

Auxins are hormones involved during the life cycle of plants and they are especially interesting because they participate in multiple morphogenetic processes. One important question is, how the same molecule can induce proliferation, elongation and differentiation at different moments and tissues during development. In this respect, auxin gradients are established within the tissues mainly by polar transport and both synthesis and inactivation of the bioactive forms. Auxin function however, is the result of a complex regulation that includes: 1) Differential expression of genes encoding the enzymes involved in the thaliana, synthesis of auxin, signalling proteins and transporters of this hormone; 2) Proteins that are involved in the signal transduction pathway; these proteins are capable of forming both homo and heterodimers which increases combinatorial formation and, therefore, the regulation of gene expression in response to auxin; 3) Some auxin carriers have dynamic and polar localization within the plasma membrane which allows flow of auxins to fit different growth conditions; 4) Finally, free auxin amount is modified by conjugation and compartmentalization. Understanding how these processes are coupled to give a differential response in cells and tissues, is one of the main challenges in the development of plants.

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