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Chromosome pairing, synapsis, and DNA recombination are three key processes that occur during early meiosis. A previous study of  Poor Homologous Synapsis 1  ( PHS1 ) in maize suggested that PHS1 has a role in coordinating these three processes. Here we report the isolation of wheat ( Triticum aestivum )  PHS1  ( TaPHS1 ), and its expression profile during and after meiosis. While the  Ta PHS1 protein has sequence similarity to other plant PHS1/PHS1-like proteins, it also possesses a unique region of oligopeptide repeat units. We show that  Ta PHS1 interacts with both single- and double-stranded DNA  in vitro  and provide evidence of the protein region that imparts the DNA-binding ability. Immunolocalisation data from assays conducted using antisera raised against  Ta PHS1 show that  Ta PHS1 associates with chromatin during early meiosis, with the signal persisting beyond chromosome synapsis. Furthermore,  Ta PHS1 does not appear to colocalise with the asynapsis protein ( Ta ASY1) suggesting that these proteins are probably independently coordinated. Significantly, the data from the DNA-binding assays and 3-dimensional immunolocalisation of  Ta PHS1 during early meiosis indicates that  Ta PHS1 interacts with DNA, a function not previously observed in either the Arabidopsis or maize PHS1 homologues. As such, these results provide new insight into the function of PHS1 during early meiosis in bread wheat.

Poor Homologous Synapsis 1 Interacts with Chromatin but Does Not Colocalise with ASYnapsis 1 during Early Meiosis in Bread Wheat