Abstract
Ubiquitin /26S proteasome pathway( UPP) is the most effective,highly selective proteolytic pathway. It mediates 80% to 85% of the protein degradation in eukaryotic cell,participates in various cellular life courses,and plays an important role in maintaining the normal physiological function of the cells. The results show that many aspects of plant growth and development as well as some processes such as drought stress response are all affected by this pathway. It summarizes ubiquitin /26S proteasome pathway,which roles in the processes of plant growth and development,and emphatically elaborates the progress of the plant drought stress response and its mechanism mediated by the ubiquitin-protein ligase E3.
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