| A hybrid between autotetraploid Triticum aegilopoides
and Agropyron intermedium By Mikio MURAMATSU Lab. Genet., Kyoto Univ., Kyoto The cross between Triticum aegilopoides and Agropyron intermedium was successful when autotetraploid T. aegilopoides var. boeoticum was the mother. The F1-plants grew very slowly, and only one attained maturity and developed ears in the second year. Certain characteristics of the hybrid were intermediate but most of the others resembled one of the parents. The somatic chromosome number, examined in root tip cells, was 2n=35 as expected. At MI, 1-3 trivalents, 6-14 bivalents and many univalents were found. Seven of the bivalents must have originated from the pairing between the two A-genomes of autotetraploid T. aegilopoides and the remaining 0-7 bivalents are considered to be due to scattered homologies between and within the three genomes of Agropyron intermedium. E, F and J. Pollen fertility varied considerably; from three examined anthers one contained only shrivelled pollen grains and the mean number of good grains in the other two amounted to 8.4%. The hybrid was completely sterile but a few seeds were obtained from pollination with pollen of diploid T. aegilopoides and the Agropyron parent. |