Molecular Plant
Abstract
Leaf shape is highly variable within and among plant species, ranging from slender to oval-shaped. This is largely determined by the proximodistal axis of growth. However, little is known about how proximal-distal growth is controlled to determine leaf shape. Here, we show thatArabidopsisleaf and sepal proximodistal growth is tuned by two phytohormones. Two class A AUXIN RESPONSE FACTORs (ARFs), ARF6 and ARF8, activate the transcription ofDWARF4, which encodes a key brassinosteroid (BR) biosynthetic enzyme. At the cellular level, the phytohormones promote more directional cell expansion along the proximodistal axis, as well as final cell sizes. BRs promote the demethyl-esterification of cell wall pectins, leading to isotropic in-plane cell wall loosening. Notably, numerical simulation showed that isotropic cell wall loosening could lead to directional cell and organ growth along the proximodistal axis. Taken together, we show that auxin acts through BRs biosynthesis to determine cell wall mechanics and directional cell growth to generate leaves of variable roundness.
| 论文编号: | DOI:10.1016/j.molp.2021.03.011 |
| 论文题目: | A Crosstalk Between Auxin and Brassinosteroid Regulates Leaf Shape by Modulating Growth Anisotropy |
| 英文论文题目: | A Crosstalk Between Auxin and Brassinosteroid Regulates Leaf Shape by Modulating Growth Anisotropy |
| 第一作者: | Yuanyuan Xiong, Binbin Wu, Fei Du, Xiaolu Guo, Caihuan Tian, Jinrong Hu, Shouqin Lü, Mian Long, Lei Zhang, Ying Wang, Yuling Jiao |
| 英文第一作者: | Yuanyuan Xiong, Binbin Wu, Fei Du, Xiaolu Guo, Caihuan Tian, Jinrong Hu, Shouqin Lü, Mian Long, Lei Zhang, Ying Wang, Yuling Jiao |
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| 发表年度: | 2021-03-16 |
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| 摘要: | Leaf shape is highly variable within and among plant species, ranging from slender to oval-shaped. This is largely determined by the proximodistal axis of growth. However, little is known about how proximal-distal growth is controlled to determine leaf shape. Here, we show thatArabidopsisleaf and sepal proximodistal growth is tuned by two phytohormones. Two class A AUXIN RESPONSE FACTORs (ARFs), ARF6 and ARF8, activate the transcription ofDWARF4, which encodes a key brassinosteroid (BR) biosynthetic enzyme. At the cellular level, the phytohormones promote more directional cell expansion along the proximodistal axis, as well as final cell sizes. BRs promote the demethyl-esterification of cell wall pectins, leading to isotropic in-plane cell wall loosening. Notably, numerical simulation showed that isotropic cell wall loosening could lead to directional cell and organ growth along the proximodistal axis. Taken together, we show that auxin acts through BRs biosynthesis to determine cell wall mechanics and directional cell growth to generate leaves of variable roundness. |
| 英文摘要: | Leaf shape is highly variable within and among plant species, ranging from slender to oval-shaped. This is largely determined by the proximodistal axis of growth. However, little is known about how proximal-distal growth is controlled to determine leaf shape. Here, we show thatArabidopsisleaf and sepal proximodistal growth is tuned by two phytohormones. Two class A AUXIN RESPONSE FACTORs (ARFs), ARF6 and ARF8, activate the transcription ofDWARF4, which encodes a key brassinosteroid (BR) biosynthetic enzyme. At the cellular level, the phytohormones promote more directional cell expansion along the proximodistal axis, as well as final cell sizes. BRs promote the demethyl-esterification of cell wall pectins, leading to isotropic in-plane cell wall loosening. Notably, numerical simulation showed that isotropic cell wall loosening could lead to directional cell and organ growth along the proximodistal axis. Taken together, we show that auxin acts through BRs biosynthesis to determine cell wall mechanics and directional cell growth to generate leaves of variable roundness. |
| 刊物名称: | Molecular Plant |
| 英文刊物名称: | Molecular Plant |
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| 其它备注: | Yuanyuan Xiong, Binbin Wu, Fei Du, Xiaolu Guo, Caihuan Tian, Jinrong Hu, Shouqin Lü, Mian Long, Lei Zhang, Ying Wang, Yuling Jiao. A Crosstalk Between Auxin and Brassinosteroid Regulates Leaf Shape by Modulating Growth Anisotropy. Molecular Plant. DOI:10.1016/j.molp.2021.03.011 |
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