Functional characterization of tomato Sl-IAA3 and Sl-hls genes. Role ...
CHAPITRE III HOOKLESS1,
CHAPITRE III HOOKLESS1, an Integrator of Multiple Signaling Pathways, Involved in Glucose and De-etiolation Toxicity/Sensitivity in Arabidopsis (Manuscript in preparation)
CHAPITRE III. HOOKLESS1, an Integrator of Multiple Signaling Pathways in Arabidopsis Title: HOOKLESS1, an Integrator of Multiple Signaling Pathways, Involved in Glucose and De-etiolation Toxicity/Sensitivity Authors: Salma Chaabouni, Alain Latche, Jean-Claude Pech, and Mondher Bouzayen ABSTRACT Plants need to adjust most of their physiological and developmental processes to constantly changing environmental conditions. With only a handful of plant hormones known, the large array of responses is probably achieved by a combinatorial mechanism of interactions between hormones and other signals. The extention of the hypocotyl has proved to be an excellent system for studing such signal interplay in the regulation of growth and developmental responses. The Arabidopsis hookless (HLS) gene wich is essential for apical hook formation, is regulated by a network of interacting factors including light and plant hormones. Herein, we report the discovery of new phenotypes associated with hls1 mutation. We describe a marked bleaching phenotype in hls1 mutant that had first been germinated in the dark before transfer to white light. The hls1 mutation also confers an enhanced tolerance to glucose and to elevated ABA concentrations. Moreover, hls1 seedlings display agravitropic growth in the dark but not in the light. These results indicate that the HLS1 gene is in the cross-road of multiple signalling pathways including ethylene, auxin, ABA, light and sugar. . . 88