Chromosome Behavior of Pollen Mother Cell Meiosis in the Hybrid Progenies from Triticum timopheevi×Avena fatua L.var.glabrata Pat Precise Identification of the Introgressed Segments in Powdery Mildew-resistant Introgression Lines of Triticum aestivum-T.timopheevi STUDIES ON FERTILITY RESTORER GENE Rf3 AGAINST G-TYPE CYTOPLASMIC MALE STERILE IN WHEAT Ⅱ GENOMIC LIBRARY CONSTRUCTION OF T.TIMOPHEEVI USING TOTAL DNA