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Name: Mouse ears (Me) Accessions: LS2 Gene ID: Solyc02g081120 Map position: chromosome 2 (long arm) Gene function: Homeobox transcription factor Gene effect: This class of transcription factor is believed to extend meristematic activity, thus producing more elaborated meristem-derived leaves. Phenotypes: Plants with the mutated allele present shortened internodes, augmented number of leaflets (leaves are 3-4 pinnate), leaflets have clavate segments. Formation of supernumerary carpels in the ovary of homozygous plants. Comments: The tomato Me/TKn2/LeT6 is orthologous to the Arabidopis SHOOT MERISTEM LESS (STM). Homeobox genes are known to down regulate gibberellins levels and up regulate cytokinin levels. The mRNA of ME is known to be translocated in phloem. Description of accessions available: MT-Me is a BC6F3 introgressed from LA0715 Figures: Heterozygous MT-Me plant showing high dissected leaves. Bibliography Chen JJ, Janssen BJ, Williams A, Sinha N (1997) A gene fusion at a Homeobox locus: alterations in leaf shape and implications for morphological evolution. Plant Cell 9:1289-1304. Hay A, Craft J, Tsiantis M (2004) Plant hormones and homeoboxes: Bridging the gap? Bioessays 26: 395–404 Janssen B-J, Lund L, Sinha N (1998) Overexpression of a homeobox gene, LeT6, reveals indeterminate features in the tomato compound leaf. Plant Physiology 117: 771–786 Kim M, Canio W, Kessler S, Sinha N (2001) Developmental changes due to longdistance movement of a Homeobox fusion transcript in tomato. Science 293:287-289. Parnis A, Cohen O, Gutfinger T, Hareven D, Zamir D, Lifschitz E (1997) The dominant developmental mutants of tomato, Mouse-ear and Curl, are associated with distinct modes of abnormal transcriptional regulation of a knotted gene. Plant Cell 9:21432158. Silva GFF, Silva EM, Azevedo MS, Guivin MAC, Ramiro DA, Figueiredo CR, Carrer H, Peres LEP, Nogueira FTS (2014) microRNA156-targeted transcription factors regulate tomato ovary and fruit development. Plant Journal, 78:604-618.