Abstract
We describe here a novel plant-specific gene, Lefsm1 (fruit SANT/MYB-like 1) harboring a single SANT/MYB domain. The expression of Lefsm1 is specific to the very early stages of tomato (Lycopersicon esculentum) fruit development. Ectopic expression of Lefsm1 results in severe developmental alterations manifested in retarded growth, and reduced apical dominance during tomato and Arabidopsis seedling development. A promoter sequence residing 1.0 kb upstream to the translation initiation codon confers the organ-specific expression of the gene. Lefsm1 belongs to a novel small gene family consisting of five to six members in tomato, Arabidopsis and rice. The SANT/MYB domain of LeFSM1 and its orthologs in Arabidopsis and rice differs from that of all other plant or animal MYB proteins and from the SANT domains found in part of the chromatin remodeling proteins. Together, our results indicate that Lefsm1 is a founding member of a small family of proteins containing a novel MYB/SANT domain which is likely to participate in the regulation of a plant-specific developmental program.
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Acknowledgements
The plasmid pGPVT-KAN was a generous gift of Dr. D. Becker (Germany). This project was supported in part by the Israeli Ministry of Science (MOST) grant number 9446, and in part by the Israeli Ministry of Agriculture Chief Scientist Fund grant number 261–0414. This publication is contribution no. 105/2004 of the Volcani Center, ARO.
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Barg, R., Sobolev, I., Eilon, T. et al. The tomato early fruit specific gene Lefsm1 defines a novel class of plant-specific SANT/MYB domain proteins. Planta 221, 197–211 (2005). https://doi.org/10.1007/s00425-004-1433-0
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DOI: https://doi.org/10.1007/s00425-004-1433-0