苏贝林
质外体
内胚层
生物物理学
化学
植物
拟南芥
拟南芥
细胞壁
开枪
突变体
导水率
水运
玫瑰花结(裂殖体外观)
生物
水流
生物化学
土壤水分
工程类
基因
环境工程
免疫学
生态学
作者
Mónica Calvo-Polanco,Zoe Ribeyre,Myriam Dauzat,Guilhem Reyt,Christopher Hidalgo-Shrestha,Patrick Diehl,Marc Frenger,Thierry Simonneau,Bertrand Muller,David E. Salt,Rochus Franke,Christophe Maurel,Yann Boursiac
摘要
The formation of Casparian strips (CS) and the deposition of suberin at the endodermis of plant roots are thought to limit the apoplastic transport of water and ions. We investigated the specific role of each of these apoplastic barriers in the control of hydro-mineral transport by roots and the consequences on shoot growth. A collection of Arabidopsis thaliana mutants defective in suberin deposition and/or CS development was characterized under standard conditions using a hydroponic system and the Phenopsis platform. Mutants altered in suberin deposition had enhanced root hydraulic conductivity, indicating a restrictive role for this compound in water transport. In contrast, defective CS directly increased solute leakage and indirectly reduced root hydraulic conductivity. Defective CS also led to a reduction in rosette growth, which was partly dependent on the hydro-mineral status of the plant. Ectopic suberin was shown to partially compensate for defective CS phenotypes. Altogether, our work shows that the functionality of the root apoplastic diffusion barriers greatly influences the plant physiology, and that their integrity is tightly surveyed.
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