The ULTRAPETALA1 gene functions early in Arabidopsis development to restrict shoot apical meristem activity and acts through WUSCHEL to regulate floral meristem determinacy

Genetics
Cristel C CarlesJennifer C Fletcher

Abstract

Shoot and floral meristem activity in higher plants is controlled by complex signaling networks consisting of positive and negative regulators. The Arabidopsis ULTRAPETALA1 (ULT1) gene has been shown to act as a negative regulator of meristem cell accumulation in inflorescence and floral meristems, as loss-of-function ult1 mutations cause inflorescence meristem enlargement, the production of extra flowers and floral organs, and a decrease in floral meristem determinacy. To investigate whether ULT1 functions in known meristem regulatory pathways, we generated double mutants between ult1 alleles and null alleles of the meristem-promoting genes SHOOTMERISTEMLESS (STM) and WUSCHEL (WUS). We found that, although the ult1 alleles have no detectable embryonic or vegetative phenotypes, ult1 mutations restored extensive organ-forming capability to stm null mutants after germination and increased leaf and floral organ production in stm partial loss-of-function mutants. Mutations in ULT1 also partially suppressed the wus shoot and floral meristem phenotypes. However, wus was epistatic to ult1 in the center of the flower, and WUS transcriptional repression was delayed in ult1 floral meristems. Our results show that during the majority of t...Continue Reading

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Citations

Jan 1, 2010·The Arabidopsis Book·Elena R Alvarez-BuyllaYara E Sánchez-Corrales
May 26, 2006·Plant Molecular Biology·Bruce Veit
Sep 10, 2005·Nature Reviews. Genetics·Beth A Krizek, Jennifer C Fletcher
Dec 3, 2009·Genes & Development·Cristel C Carles, Jennifer C Fletcher
Aug 5, 2009·Genes & Development·Feng Ming, Hong Ma
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Aug 31, 2011·F1000 Biology Reports·Ralf Müller, Justin Goodrich
Apr 19, 2012·The New Phytologist·Marcus T BrockCynthia Weinig
Sep 27, 2005·Current Opinion in Plant Biology·Leor Williams, Jennifer C Fletcher
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Feb 24, 2015·Frontiers in Plant Science·Bo Sun, Toshiro Ito
May 6, 2014·Frontiers in Plant Science·Paolo PesaresiSimona Masiero
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May 23, 2012·Plant Science : an International Journal of Experimental Plant Biology·Mohamed Elhiti, Claudio Stasolla
Mar 6, 2018·Journal of Experimental Botany·Gilles VachonCristel C Carles
Dec 1, 2017·Frontiers in Plant Science·Jennifer C Fletcher
Sep 24, 2019·The New Phytologist·Diego Ornelas-AyalaMaría de la Paz Sanchez
Jul 8, 2020·Genome Biology·Rajiv K ParvathaneniAndrea L Eveland
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Mar 16, 2021·Frontiers in Plant Science·Diego Ornelas-AyalaMaría de la Paz Sanchez
Oct 16, 2004·Development·Liam Dolan, Jane A Langdale

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