| An intergeneric hybrid between Eremopyrum orientale
(LINN). JAUB. et SPACH. and Aegilops squarrosa LINN. Sadao SAKAMOTO National Institute of Genetics, Misima, Japan An intergeneric triploid hybrid between Er. orientale (2n=28; Iran) and Ae. squarrosa (2n=14; material received from Dr. H. KAPPERT) was obtained in 1964. The shape of the F1 spikes was intermediate between the parents but the spikelets showed characters of Eremopyrum. Pollen- and seed-sterility were complete. Chromosome pairing at MI of PMC's of the F1 is given in Table 1. Average chromosome pairing per cell was 0.1II + 20.8I. All bivalents observed were associated loosely by a terminal chiasma. This indicates that the genomes of Er. orientale are quite different from the D-genome of Ae. squarrosa. |