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Background  Although a number of leucine-rich repeat receptor-like kinase-encoding genes ( LRR-RLKs ) have been identified in plants, a functional role has been determined for only a few. Recent studies have demonstrated that an LRR-RLK, PXY/TDR, is important for the process of secondary vascular development. Other studies have indicated that PXY/TDR is unlikely to be the sole LRR-RLK involved in this complex process.    Results  In this study,  in silico  analyses led to the identification of three  Arabidopsis LRR-RLK  genes ( PXY-correlated; PXC1, 2, 3 ) with transcript accumulation profiles that correlated strongly with several key regulators of vascular development, including  PXY/TDR ,  HB-8 ,  REV , and  CLE41 . Expression profiling using qPCR and promoter:reporter lines indicated that all three  PXC  genes are associated with the vasculature. One in particular,  PXC1  ( At2g36570 ) ,  had a strong correlation with  PXY/TDR . Shifting  pxc1  mutants from long-days to short-days showed that loss of the gene led to a dramatic reduction in secondary wall formation in xylem fibers. Transcript analysis of mutants for a variety of secondary cell wall-associated genes, including  PXY/TDR  indicated that the pathways mediated by PXC1 connect with those mediated by the TDIF-PXY/TDR-WOX4 system.    Conclusions  The data indicate that the LRR-RLK, PXC1 is involved in secondary cell wall formation in xylem fibers. Whereas further study is needed to identify the ligands and mode of action of the PXC1 protein, it is clear from this work that similarly to the shoot apical meristem (SAM), secondary vascular development requires contributions from a number of LRR-RLKs.

The Arabidopsis LRR-RLK, PXC1, is a regulator of secondary wall formation correlated with the TDIF-PXY/TDR-WOX4 signaling pathway