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Rice CASP1 regulates suberin deposition in small lateral roots and plays crucial role in metal homeostasis in plant
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  • Xianfeng Yang,
  • Huifang Xie,
  • Qunqing Weng,
  • Kangjing Liang,
  • Xiujuan Zheng,
  • Yuchun Guo,
  • Xinli Sun
Xianfeng Yang
Fujian Agriculture and Forestry University
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Huifang Xie
Fujian Agriculture and Forestry University
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Qunqing Weng
Fujian Agriculture and Forestry University
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Kangjing Liang
Fujian Agriculture and Forestry University
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Xiujuan Zheng
Fujian Agriculture and Forestry University
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Yuchun Guo
Fujian Agriculture and Forestry University
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Xinli Sun
Fujian Agriculture and Forestry University
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Abstract

Arabidopsis Casparian strip membrane domain proteins (CASPs) form a transmembrane scaffold to recruit lignin biosynthetic enzymes for Casparian strip (CS) formation. Compared with Arabidopsis, rice root is more complex with a CS of the exodermis and sclerenchyma and a CS that does not block propidium iodide entry into the stele. Rice CASP1 is highly similar to AtCASPs, but it is not required for CS formation. Its mutation results in early leaf senescence and fewer tillers and does not change the CS structure and permeability. OsCASP1 is mainly located in the nuclear membrane. Its expression is concentrated in the root stele and at small lateral root tips and can be induced by salt stress. OsCASP1 mutation causes ectopic suberin deposition in small lateral roots and ion imbalances in the plant. Homeostatic disorder induces nutrient recycling and accelerate leaf senescence. To our knowledge, OsCASP1 is the first CASP to be described in the nuclear membrane; it modulates suberin deposition and does not involve CS formation, representing a novel regulatory mode of CASPs.

Peer review status:UNDER REVIEW

11 Jun 2020Submitted to Plant, Cell & Environment
20 Jun 2020Assigned to Editor
20 Jun 2020Submission Checks Completed
27 Jun 2020Reviewer(s) Assigned
17 Jul 2020Review(s) Completed, Editorial Evaluation Pending