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Acta Agron Sin ›› 2012, Vol. 38 ›› Issue (05): 880-886.doi: 10.3724/SP.J.1006.2012.00880

• TILLAGE & CULTIVATION·PHYSIOLOGY & BIOCHEMISTRY • Previous Articles     Next Articles

Effects of Root Border Cells on Root Growth and Cell Wall Polysaccharide Contents in Rice Seedlings and Their Relation to Aluminum Tolerance

XING Cheng-Hua1,ZHANG Shu-Na2,WU Kun2,WANG Ning2,LING Yun2   

  1. 1 Agricultural and Bioengineering Institute, Jinhua College of Vocation and Technology, Jinhua 321007, China; 2 College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua 321004, China
  • Received:2011-08-17 Revised:2012-01-19 Online:2012-05-12 Published:2012-02-13

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Abstract: Most plant root tips are sheathed by large populations of root border cells (RBCs). One of suggested roles of RBCs is to defend from toxic metal cations, including Al, in the rhizosphere. Using rice genotypes “II You 3027” (Al-resistant) and “Hongliangyou 166” (Al-sensitive) with treatments of different concentrations of Al3+, acroponic culture with RBCs adhered to or removed from root tips was conducted to study the effects of RBCs on root growth, Al content and cell wall polysaccharide contents in root tips of rice seedlings under Al toxicity. Al treatment inhibited root elongation and increased Al accumulation in the root tips. Removal of RBCs from root tips significantly enhanced Al-induced root growth inhibition and increased callose content, Al accumulation in root tips and root tip cell walls, and monomeric Al content in root tips. The removal of RBCs from root tips also significantly increased pectin and hemicellulose 1 contents in the cell walls of root tips, but did not affect the hemicellulose 2 contents. These results suggested that RBCs adhered to the root tips enhance Al tolerance of rice by decreasing Al, pectin and hemicellulose 1 contents in the cell walls of root tips, and contents of toxic species of Al in root tips.

Key words: Rice, Al toxicity, Root border cells, Al species, Cell wall polysaccharide

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