ENTIRE and GOBLET promote leaflet development in tomato by modulating auxin response

The Plant Journal : for Cell and Molecular Biology
Hadas Ben-GeraNaomi Ori

Abstract

Compound leaves produce leaflets in a highly controlled yet flexible pattern. Here, we investigate the interaction between auxin, the putative auxin response inhibitor ENTIRE (E, SlIAA9) and the CUC transcription factor GOBLET (GOB) in compound-leaf development in tomato (Solanum lycopersicum). Auxin maxima, monitored by the auxin response sensor DR5, marked and preceded leaflet and lobe initiation. The DR5 signal increased, but maxima were partially retained in response to the external or internal elevation of auxin levels. E directly interacted with the auxin receptors SlTIR1 and SlAFB6. Furthermore, E was stabilized by a mutation in domain II of the protein and by the inhibition of auxin or proteasome activity, implying that E is subjected to auxin-mediated degradation. In e mutants the DR5 signal expanded to include the complete leaf margin, and leaf-specific overexpression of a stabilized form of E inhibited the DR5 signal and lamina expansion. Genetic manipulation of GOB activity altered the distribution of the DR5 signal, and the inhibition of auxin transport or activity suppressed the GOB overexpression phenotype, suggesting that auxin mediates GOB-regulated leaf patterning. Whereas leaves of single e or gob mutants dev...Continue Reading

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Citations

Nov 13, 2013·Plant Physiology·Liangfa GeRujin Chen
Jan 24, 2013·Proceedings of the National Academy of Sciences of the United States of America·Ali Ahmad NazKlaus Theres
Sep 24, 2015·The New Phytologist·Quan WangKlaus Theres
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Feb 23, 2021·Journal of Integrative Plant Biology·Hongfeng WangChuanen Zhou
Nov 6, 2014·Development·Maya Bar, Naomi Ori

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