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Free Content TFL2/LHP1 is involved in auxin biosynthesis through positive regulation of YUCCA genes

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Summary

TERMINAL FLOWER2 (TFL2) is the plant homologue of metazoan HETEROCHROMATIN PROTEIN1 (HP1) protein family. It is known that, unlike most HP1 proteins, TFL2 does not primarily localize to heterochromatin; instead it functions in regulation of specific genes in euchromatic regions. We show that the tfl2 mutant has a lower rate of auxin biosynthesis, resulting in low levels of auxin. In line with this, tfl2 mutants have lower levels of expression of auxin response genes and retain an auxin response. The reduced rate of auxin biosynthesis in tfl2 is correlated to the down-regulation of specific genes in the tryptophan-dependent auxin biosynthesis pathway, a sub-set of the YUCCA genes. In vivo, TFL2 is targeted to a number of the YUCCA genes in an auxin-dependent fashion revealing a role of TFL2 in auxin regulation, probably as a component of protein complexes affecting transcriptional control.
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Keywords: Aux/IAA; TERMINAL FLOWER2/LIKE HETEROCHROMATIN PROTEIN1; YUCCA; auxin biosynthesis; auxin response; epigenetic

Document Type: Research Article

Affiliations: 1: Evolutionary Biology Center, Physiological Botany, Uppsala University, SE-752 36 Uppsala, Sweden 2: Uppsala BioCenter, Department of Plant Biology and Forest Genetics, Swedish University of Agricultural Sciences, Box 7080, SE-750 07 Uppsala, Sweden 3: Umeå Plant Science Centre, Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, SE-901 83 Umeå, Sweden

Publication date: March 1, 2011

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