Studies on Chromosome Doubling of Triticum durum-Haynaldia villosa Intergeneric Hybrid Calli Polyploid Induction on the Hybrid of Miscanthus lutarioriparia×Miscanthus sinensis Fertility Spontaneously Restoring of Inflorescence and Chromosome Doubling by C hemical Treatment in Maize Haploid Development of Winter Synthetic Hexaploid Wheat Research Progress in the Mechanism of Parthenogenesis Haploid Induction and Doubling on Maize POLLEN CHROMOSOME DOUBLING UNDER HIGH TEMPERATURE IN Populus alba L. Callus polyploidy induction and identification of Russian wild ryegrass Pollen Chromosome Doubling of Orychophragmus violaceus L.Induced by High Temperature The Analysis of the Biological Characters in Hexapod hybrids Derived from Brassica carinata and B. rapa STUDIES ON CHROMOSOME DOUBLING, TRANSPLANTING AND MANAGEMENT OF TUBE SHOOTS IN WHEAT STUDY ON THE EFFECTIVE TREATING PERIOD FOR POLLEN CHROMOSOME DOUBLING OF POPULUS TOMENTOSA×P.BOLLEANA Colchicine-induced Pollen Chromosome Doubling and its Cytological Effects in Populus alba L.