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The ubiquitin-proteasome system（UPS）is an important regulatory system for proteostasis in organisms. By means of degrading different target proteins，UPS participates in diverse cellular processes. SINA E3 ubiquitin ligase is a key type of E3 ubiquitin ligases of UPS，playing extensive and important biological functions. This research elaborated the functional research status of SINA E3 ubiquitin ligase since the first one was discovered in plant. Four main aspects of its functions，including in plant growth and development，plant responses under adverse environment，interactions between plant and other organisms and plant autophagy were expounded. Generally，all the reported functions of SINA E3 ubiquitin ligase in plant were summarized. Meanwhile，the existing issues and research prospects for functional study of SINA E3 in plant are proposed. Therefore，all the above would provide valuable reference for the further functional research of SINA E3 in the future. [ABSTRACT FROM AUTHOR]

[Objective]The identification and analyses of heat shock proteins（HSP20s/sHSPs）in kiwifruit would lay foundation for the functional studies of AcHSP20 genes and resistance breeding of kiwifruit.[Method]Based on the genome-wide data of kiwifruit, the AcHSP20 gene family was identified, and the physicochemical properties, phyletic evolution, chromosome distribution, gene structure, subcellular localization as well as promoters were analyzed by bioinformatics.[Result]The 34 members of AcHSP20 gene family were identified. They encoded proteins with 85-371 amino acids, 9.93-40.18 kD molecular weight（Mw）and 4.4-9.3 isoelectric points（pI）. Meanwhile, most AcHSP20 proteins were predicted to be located in cytoplasm and chloroplast. The 34 AcHSP20 genes were distributed on 17 chromosomes, and there were no or only one intron, mostly. Promoters of AcHSP20 genes had phytohormone and abiotic stress response elements. All the detected AcHSP20 genes expressed ubiquitously in the roots, stems and leaves of kiwifruit and the expressions changed significantly under abiotic stresses and phytohormone treatments.[Conclusion]The AcHSP20 gene family plays important roles in high temperature, ABA, MeJA, NaCl stress responses in kiwifruit. [ABSTRACT FROM AUTHOR]