CYTOLOGICAL EFFECTS OF POLLEN IRRADIATION ON WHEAT× Leymus angustus Hybrids THE EFFECTS OF MAIZE POLLEN IRRADIATION ON THE SEED SETTING OF F_1M_1 AND THE PLANT GROWING OF SUBSEQUENT GENERATIONS Recovery of cucumber (Cucumis sativus L.) haploid plants through pollination by irradiated pollens and embryo culture ENHANCEMENT OF INTERGENERIC HYBRIDIZATION BETWEEN COMMON WHEAT AND Leymus angustus BY MEANS OF POLLEN IRRADIATION Mass Production of Intergeneric Chromosomal Translocations through Pollen Irradiation of Triticum durum-Haynaldia villosa Amphiploid