[No authors listed]
The ubiquitination pathway is involved in a variety of cellular processes in plant growth, development, and immune responses. However, the function of this pathway in connecting plant development and innate immunity is still largely unknown. Recently, we characterized the U-box/ARM E3 ubiquitin ligase PUB13, which regulates both immune responses and flowering time in Arabidopsis. Here, we show that the rice Spl11 gene can complement the cell death and flowering functions of PUB13 in the pub13 mutant. In addition, HFR1, which functions mainly in photomorphogenesis, was identified as one of the PUB13-interacting proteins through yeast two-hybrid screening and pull-down assays. Because the flowering phenotype of pub13 depends on photoperiod, we propose that PUB13 may regulate HFR1 to fine-tune photomorphogenesis and flowering time in Arabidopsis.
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