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.
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