TCP14 and TCP15 participate in temperature-dependent developmental responses in Arabidopsis thaliana

LUCIA FERRERO; IVANA VIOLA; DANIEL GONZALEZ

Cordoba

Congreso; LII Reunión anual de la SAIB; 2016

TCP transcription factors are exclusive to plants and are mainly involved in the regulation of developmental processes and hormone responses. They can be grouped into two major classes, I and II. In this work, we studied the role of two closely related class I TCP proteins, TCP14 and TCP15, in the response to temperature in Arabidopsis thaliana. Loss-of-function mutants in TCP14 and TCP15 showed a reduced response to an increase in temperature from 22°C to 29°C, reflected in reduced hypocotyl and petiole elongation. The induction of the auxin biosynthesis gene YUC8 was not affected in these plants, but the expression of members of the auxin-responsive SAUR family was reduced. In addition, the expression of TCP15 is reduced in the PIF4 mutant pif4-2 that is unable to respond to a raise in temperature. Mutants in TCP14 and TCP15 also showed a reduced response of hypocotyl elongation to gibberellin or auxin treatments. Our results suggest that TCP14 and TCP15 participate in hormonal responses during temperature-induced growth in Arabidopsis.