Abstract
A study was conducted on Bromus inermis Leyss. in an attempt to find haploids from twin seedling's. In 80,492 germinated seeds examined from 10 varieties, 298 twin seedlings were obtained, none of which was haploid. One triplo-diplo pair of twins was found, all others being diploid. The triplo-diplo twins had 83 and 57 chromosomes, respectively. A possible explanation of this phenomenon is presented. A high frequency of the diplo-diplo twins differed morphologically from one another. It is suggested that simultaneous fertilization by two pollen grains occurred in these cases. It was concluded that screening twin-seedlings cannot be recommended as a method of obtaining haploids in B. inermis.
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