Abstract
Ubiquitination plays essential roles in the regulation of many processes in plants including pollen rejection in self-incompatible species. In the Brassicaceae (mustard family), self-incompatibility drives the rejection of self-pollen by preventing pollen hydration following pollen contact with the stigmatic surface. Self-pollen is recognized by a ligand-receptor pair: the pollen S-locus cysteine rich/S-locus protein 11 (SCR/SP11) ligand and the pistil S receptor kinase (SRK). Following self-pollen contact, the SCR/SP11 ligand on the pollen surface binds to SRK on the pistil surface, and the SRK-activated signaling pathway is initiated. This pathway includes the armadillo repeat containing 1 (ARC1) protein, a member of the plant U-box (PUB) family of E3 ubiquitin ligases. ARC1 is a functional E3 ligase and is required downstream of SRK for the self-incompatibility response. This mini review highlights our recent progress in establishing ARC1’s conserved role in self-pollen rejection in Brassica and Arabidopsis species and discusses future research directions in this field.
Highlights
Plants have evolved complex signaling networks to survive their sessile existence, and protein ubiquitination underpins many of these systems
This mini review will focus on the role of ubiquitination in the Brassicaceae system that has been well characterized in the Brassica and Arabidopsis species
REGULATORY PROTEINS ACTING DOWNSTREAM OF S receptor kinase (SRK) In addition to the role of SCR/SP11 and SRK in mediating initial self-pollen recognition, there are two other proteins that have been identified as positive regulators of the self-incompatibility response in Brassica: the M-locus protein kinase (MLPK; Murase et al, 2004; Kakita et al, 2007b) and the E3 ubiquitin ligase, Armadillo (ARM)-repeat containing 1 (ARC1; Gu et al, 1998; Stone et al, 1999, 2003)
Summary
Plants have evolved complex signaling networks to survive their sessile existence, and protein ubiquitination underpins many of these systems. REGULATORY PROTEINS ACTING DOWNSTREAM OF SRK In addition to the role of SCR/SP11 and SRK in mediating initial self-pollen recognition, there are two other proteins that have been identified as positive regulators of the self-incompatibility response in Brassica: the M-locus protein kinase (MLPK; Murase et al, 2004; Kakita et al, 2007b) and the E3 ubiquitin ligase, Armadillo (ARM)-repeat containing 1 (ARC1; Gu et al, 1998; Stone et al, 1999, 2003).
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