Journal article
PETAL LOSS is a boundary gene that inhibits growth between developing sepals in Arabidopsis thaliana
ER Lampugnani, A Kilinc, DR Smyth
Plant Journal | Published : 2012
Abstract
Flower primordia are partitioned by boundaries during their early development. Such boundaries occur between whorls of organs, and also between organs within whorls. PETAL LOSS (PTL) is a trihelix transcription factor gene that is expressed in boundaries between sepal primordia in the outer whorl. Over-expression of PTL results in growth suppression suggesting that PTL normally inhibits growth between newly arising sepals. We have tested this by examining the consequences of loss of PTL function using confocal imaging. The size of the inter-sepal zone in stage 4 buds expands radially by 35-40% in ptl-1 mutants as a consequence of additional cell proliferation. There is no change in the size ..
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Awarded by Australian Research Council
Funding Acknowledgements
We thank Monash Micro-Imaging, especially Gunta Jaudzems, Steven Firth and Ian Harper, for excellent facilities and advice; Jiri Friml, Elliot Meyerowitz, Masao Tasaka and the Arabidopsis Biological Resource Center (Columbus, OH, USA) for seeds; Marcus Heisler for the VENUS-N7 construct; Megan Griffith for drawing attention to the ptl eep1 phenotype; and John Bowman, Phil Brewer, Ruth N. Kaplan-Levy, Martin O'Brien, Tezz Quon, Pia Sappl and Marnie Soso for interest and feedback. This work was supported by the Australian Research Council (DP0451208). The authors have no conflicts of interest to declare.