植物GH3基因家族生物学功能研究进展

园园, 恩和巴雅尔, 齐艳华

Research Advances in Biological Functions of GH3 Gene Family in Plants

Yuan Yuan, Enhebayaer, Qi Yanhua

图2 植物体内生长素(IAA)动态平衡(参考Hagen and Guilfoyle, 2002; Woodward and Bartel, 2005) (A) IAA浓度较高时, ARF与Aux/IAAs二聚体分离, ARF结合到相应的AuxREs并激活GH3表达, 催化IAA与氨基酸结合; (B) IAA浓度较低时, ARF与Aux/IAAs形成二聚体并关闭AuxREs, GH3基因转录受到抑制, 作为生长素贮存库的IAA-Ala和IAA-Leu由酰胺水解酶水解, 重新释放出IAA。

Figure 2 Auxin (IAA) dynamic equilibrium in plants (refer to Hagen and Guilfoyle, 2002; Woodward and Bartel, 2005) (A) Under higher IAA concentration, ARF splits with Aux/IAAs dimer, and ARF binds to AuxREs and activates the expression of GH3, which catalyzes the binding of IAA to amino acids; (B) Under lower IAA concentration, ARF forms a dimer with Aux/IAAs and turns off AuxREs, GH3 gene transcription is inhibited, and IAA-Ala and IAA-Leu, which are auxin reservoirs, are hydrolyzed by amidohydrolase to release IAA again.