The impact of aluminium on the distribution of cell wall glycoproteins of pea root tip and their Al-binding capacity
2001
Kenjebaeva, S. (Genetics and Bioengineering of Kazakh Ministry of Education and Academy of Sciences, Almaty (Kazakstan)) | Yamamoto, Y. | Matsumoto, H.
Pea (Pisum sativum L.) roots were exposed to various concentrations of Al and cell wall glycoproteins containing salt-extractable proteins, SDS-extractable proteins, covalently bound proteins (CBPs), and extensins were separately extracted. The changes in their levels and the amount of bound Al to glycoproteins upon Al stress were investigated. The content of CBPs, but not of others, increased significantly with the increase of Al levels. Extensins and the salt-extractable proteins, but not the others, exhibited a marked Al-binding capacity in vivo. The amount of Al bound to extensions in vivo and in vitro was highest among the glycoproteins. The high Al-binding capacity of extensins might be caused by the high content of the hydroxy groups in hydroxyproline of extensins and Al-binding capacity to glycoproteins in the root tips may be involved in the Al-binding response in the apoplast.
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