A Genetic Analysis to the Progenies of Atrazine-Resistance Transgenic Soybean Plant Effect of Abscisic Acid Treatment on psbA Gene Expression in Two Wheat Cultivars during Grain Filling Stage under Drought Stress NUCLEAR GENOMIC HOMOLOGOUS SEQUENCE OF CHLOROPLAST psbA GENE IN RICE (ORYZA SATIVA L.) CLUSTER ANALYSIS AND CODON USAGE BIAS STUDIES ON psbA GENES FROM 11 PLANT SPECIES