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- Title
Ethylene is involved in root phosphorus remobilization in rice (Oryza sativa) by regulating cell-wall pectin and enhancing phosphate translocation to shoots.
- Authors
Xiao Fang Zhu; Chun Quan Zhu; Xu Sheng Zhao; Shao Jian Zheng; Ren Fang Shen
- Abstract
* Background and aims Plants are able to grow under phosphorus (P)-deficient conditions by coordinating Pi acquisition, translocation from roots to shoots and remobilization within the plant. Previous reports have demonstrated that cell-wall pectin contributes greatly to rice cell-wall Pi re-utilization under P-deficient conditions, but whether other factors such as ethylene also affect the pectin-remobilizing capacity remains unclear. * Methods Two rice cultivars, 'Nipponbare' (Nip) and 'Kasalath' (Kas) were cultured in the þP (complete nutrient solution), -P (withdrawing P from the complete nutrient solution), þPþACC (1-amino-cyclopropane-1-carboxylic acid, an ethylene precursor, adding 1 µM ACC to the complete nutrient solution) and -PþACC (adding 1 µM ACC to -P nutrient solution) nutrient solutions for 7 d. * Key Results After 7 d -P treatment, there was clearly more soluble P in Nip root and shoot, accompanied by additional production of ethylene in Nip root compared with Kas. Under P-deficient conditions, addition of ACC significantly increased the cell-wall pectin content and decreased cell-wall retained P, and thus more soluble P was released to the root and translocated to the shoot, which was mediated by the expression of the P deficiency-responsive gene OsPT2, which also strongly induced by ACC treatment under both P-sufficient and P-deficient conditions. * Conclusions Ethylene positively regulates pectin content and expression of OsPT2, which ultimately makes more P available by facilitating the solubilization of P fixed in the cell wall and its translocation to the shoot.
- Subjects
RICE microbiology; EFFECT of phosphorus on plants; PHOSPHORUS in soils; L-form bacteria; PECTINS; GENE expression in plants
- Publication
Annals of Botany, 2016, Vol 118, Issue 4, p645
- ISSN
0305-7364
- Publication type
Article
- DOI
10.1093/aob/mcw044