https://orcid.org/0000-0003-2447-6161
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Yunqing Yu, New Interacting Partners of BLADE-ON-PETIOLE in Regulation of Plant Development, Plant Physiology, Volume 180, Issue 2, June 2019, Pages 697–698, https://doi.org/10.1104/pp.19.00459
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Organ boundaries are junctions that separate initiating lateral organs from the meristem or other plant parts. Cells at the boundary often exhibit slow growth rates and morphology distinct from that of the surrounding cells, and their development is controlled by complex gene networks. Lateral organ boundary marker genes BLADE-ON-PETIOLE1 (BOP1) and BOP2 are two closely related members in the Broad Complex, Tramtrack and Bric-a-brac/POX virus and Zinc finger domain family, encoding plant-specific transcriptional coactivators. As indicated by the gene name, a dominant negative mutant of bop1 was first identified with ectopic leaf growth on petioles from an ethylmethane sulfonate mutant screen in Arabidopsis (Arabidopsis thaliana). Ectopic outgrowth also occurs in the stem and at the base of floral organs due to ectopic meristematic activities in these tissues (Ha et al., 2003). In addition, BOP1 and BOP2 function redundantly in various aspects of lateral organ and boundary development, including leaf, stem, and flower patterning, and abscission zone development (Khan et al., 2014). Broad Complex, Tramtrack and Bric-a-brac/POX virus and Zinc finger domain proteins lack a DNA binding domain and interact with the TGACG-motif binding (TGA) class of basic leucine zipper transcription factors (TFs) for DNA binding (Khan et al., 2014). Previous analysis showed that BOP1 and BOP2 physically interact with PERIANTHIA (Fig. 1), a class V TGA, to regulate flower development, particularly sepal numbers (Hepworth et al., 2005). In this issue of Plant Physiology, Wang et al. (2019) demonstrate that BOP1 and BOP2 and two clade I TGA proteins, TGA1 and TGA4, together regulate meristem maintenance and inflorescence architecture.
