Tryptophan-independent auxin biosynthesis contributes to early embryogenesis in Arabidopsis

• DOI: 10.1073/pnas.1503998112
• Publication Date: 2015-03-24T03:17:43Z
• Authors: Bing Wang; Jinfang Chu; Tianying Yu; Qian Xu; Xiaohong Sun; Jia Yuan; Guosheng Xiong; Guodong Wang; Yonghong Wang; Jiayang Li
• Keywords: Indole-3-acetic acid

Significance The phytohormone indole-3-acetic acid (IAA) plays a vital role in plant growth and development. IAA can be synthesized through the precursor tryptophan (Trp), known as Trp-dependent biosynthetic pathway. However, may also proposed Trp-independent Although biosynthesis was hypothesized 20 years ago, it remains mystery. In this paper, we provide compelling evidence that cytosol-localized indole synthase (INS) initiates pathway spatial temporal expression of INS an important establishment apical–basal pattern during early embryogenesis, demonstrating -independent pathways coordinately regulate embryogenesis higher plants.