Cloning and Expression of Pinb Gene in Aegilops bicornis Distribution of Grain Hardness and Allelic Variation of Puroindoline Gene in Russian Wheat Varieties Distribution of Grain Hardness and Puroindoline Alleles in Landraces, Historical and Current Wheats in Shandong Province Allelic Variations of Puroindoline a and Puroindoline b Genes in New Type of Synthetic Hexaploid Wheats from CIMMYT Cloning and Expression of Pinb Gene in Aegilops tauschii