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Biphasic Control of Cell Expansion by Auxin Coordinates Etiolated Seedling Development
Minmin Du, Firas Bou Daher, Yuanyuan Liu, Andrew Steward, Molly Tillmann, Xiaoyue Zhang, Jeh Haur Wong, Hong Ren, Jerry D. Cohen, Chuanyou Li, William M. Gray
Science Advances
Abstract
Seedling emergence is critical for food security. It requires rapid hypocotyl elongation and apical hook formation, both of which are mediated by regulated cell expansion. How these events are coordinated in etiolated seedlings is unclear. Here, we show that biphasic control of cell expansion by the phytohormone auxin underlies this process. Shortly after germination, high auxin levels restrain elongation. This provides a temporal window for apical hook formation, involving a gravity-induced auxin maximum on the eventual concave side of the hook. This auxin maximum induces PP2C.D1 expression, leading to asymmetrical H+-ATPase activity across the hypocotyl that contributes to the differential cell elongation underlying hook development. Subsequently, auxin concentrations decline acropetally and switch from restraining to promoting elongation, thereby driving hypocotyl elongation. Our findings demonstrate how differential auxin concentrations throughout the hypocotyl coordinate etiolated development, leading to successful soil emergence.
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论文编号: |
DOI:10.1126/sciadv.abj157 |
论文题目: |
Biphasic Control of Cell Expansion by Auxin Coordinates Etiolated Seedling Development |
英文论文题目: |
Biphasic Control of Cell Expansion by Auxin Coordinates Etiolated Seedling Development |
第一作者: |
Minmin Du, Firas Bou Daher, Yuanyuan Liu, Andrew Steward, Molly Tillmann, Xiaoyue Zhang, Jeh Haur Wong, Hong Ren, Jerry D. Cohen, Chuanyou Li, William M. Gray |
英文第一作者: |
Minmin Du, Firas Bou Daher, Yuanyuan Liu, Andrew Steward, Molly Tillmann, Xiaoyue Zhang, Jeh Haur Wong, Hong Ren, Jerry D. Cohen, Chuanyou Li, William M. Gray |
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2022-01-13 |
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Seedling emergence is critical for food security. It requires rapid hypocotyl elongation and apical hook formation, both of which are mediated by regulated cell expansion. How these events are coordinated in etiolated seedlings is unclear. Here, we show that biphasic control of cell expansion by the phytohormone auxin underlies this process. Shortly after germination, high auxin levels restrain elongation. This provides a temporal window for apical hook formation, involving a gravity-induced auxin maximum on the eventual concave side of the hook. This auxin maximum induces PP2C.D1 expression, leading to asymmetrical H+-ATPase activity across the hypocotyl that contributes to the differential cell elongation underlying hook development. Subsequently, auxin concentrations decline acropetally and switch from restraining to promoting elongation, thereby driving hypocotyl elongation. Our findings demonstrate how differential auxin concentrations throughout the hypocotyl coordinate etiolated development, leading to successful soil emergence. |
英文摘要: |
Seedling emergence is critical for food security. It requires rapid hypocotyl elongation and apical hook formation, both of which are mediated by regulated cell expansion. How these events are coordinated in etiolated seedlings is unclear. Here, we show that biphasic control of cell expansion by the phytohormone auxin underlies this process. Shortly after germination, high auxin levels restrain elongation. This provides a temporal window for apical hook formation, involving a gravity-induced auxin maximum on the eventual concave side of the hook. This auxin maximum induces PP2C.D1 expression, leading to asymmetrical H+-ATPase activity across the hypocotyl that contributes to the differential cell elongation underlying hook development. Subsequently, auxin concentrations decline acropetally and switch from restraining to promoting elongation, thereby driving hypocotyl elongation. Our findings demonstrate how differential auxin concentrations throughout the hypocotyl coordinate etiolated development, leading to successful soil emergence. |
刊物名称: |
Science Advances |
英文刊物名称: |
Science Advances |
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其它备注: |
Minmin Du, Firas Bou Daher, Yuanyuan Liu, Andrew Steward, Molly Tillmann, Xiaoyue Zhang, Jeh Haur Wong, Hong Ren, Jerry D. Cohen, Chuanyou Li, William M. Gray. Biphasic Control of Cell Expansion by Auxin Coordinates Etiolated Seedling Development. Science Advances. DOI:10.1126/sciadv.abj157 |
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