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Increasing investigations reveal that ubiquitin-proteasome system plays important roles in modulating plant growth and abiotic stress response.And ubiquitin receptors,UBL/UBA (ubiquitin-like/ubiquitin-associated),play a role in protein degradation through ubiquitin-proteasome pathway in yeast and human,however,the regulatory function of UBL/UBA proteins in rice is largely unclear.