Chinese Bulletin of Botany     2014 49 (6):  672-681    ISSN: 1674-3466:  CN: 11-5705/Q Codon Bias of Pyruvate Orthophosphate Dikinase Gene in Amaranthus hypochondriacus Jiangting Nie1, Yunfeng Bai2,3*, Feiyan He1, Jianjun Yan2, Weifeng Zhang2 1College of Biological Engineering, Shanxi University, Taiyuan 030006, China 2Institute of Crop Sciences, Shanxi Academy of Agricultural Sciences, Taiyuan 030031, China 3Key Laboratory of Loess Plateau Crop Gene Resources & Germplasm Creation of Agriculture Ministry, Institute of Variety Resources, Shanxi Academy of Agricultural Sciences, Taiyuan 030031, China Received 2014-04-24  Revised 2014-07-22  Online 2014-11-01 Reference   Corresponding author: Yunfeng Bai