Cloning of Coding Sequence of Glutamin Synthetase from Polygonum sibiricum Laxm. and Its Expression under Alkali Salinity Stress Textual research for Tibetan medicine Qumazi Systematic position of Reynoutria and Polygonum sibiricum inferred from sequences of chloroplast trnL-F and matK Function of Non-specific Lipid Transfer Protein Gene PsnsLTP in Polygonum sibiricum Laxm The study of protein expression patterns in different parts of Polygonum sibiricum after treatment with NaHCO_3 through SDS-PAGE