期刊
PLANT JOURNAL
卷 106, 期 4, 页码 928-941出版社
WILEY
DOI: 10.1111/tpj.15208
关键词
auxin signaling; auxin biosynthesis; root growth
资金
- National Natural Science Foundation of China [31470371]
- Joint NSFC-ISF Research Grant [32061143005]
- Specialized Fund for the Basic Research Operating Expenses Program of Shandong University [2017JQ04]
- Youth Interdisciplinary Science and Innovative Research Groups of Shandong University [2020QNQT014]
Manipulating the local response and synthesis of the plant hormone auxin revealed the contributions of different cell types to root growth and development. Inhibiting or enhancing auxin signaling in various cell types had significant impacts on root growth, with the most pronounced effects observed in the endodermis.
The plant hormone auxin plays a critical role in root growth and development; however, the contributions or specific roles of cell-type auxin signals in root growth and development are not well understood. Here, we mapped tissue and cell types that are important for auxin-mediated root growth and development by manipulating the local response and synthesis of auxin. Repressing auxin signaling in the epidermis, cortex, endodermis, pericycle or stele strongly inhibited root growth, with the largest effect observed in the endodermis. Enhancing auxin signaling in the epidermis, cortex, endodermis, pericycle or stele also caused reduced root growth, albeit to a lesser extent. Moreover, we established that root growth was inhibited by enhancement of auxin synthesis in specific cell types of the epidermis, cortex and endodermis, whereas increased auxin synthesis in the pericycle and stele had only minor effects on root growth. Our study thus establishes an association between cellular identity and cell type-specific auxin signaling that guides root growth and development.
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