| F1 hybrids between three species of Triticum
and Agiropyron intermedium S. MATSUMURA and M. MURAMATSU National Inst. of Genetics, Misima and Lab. Gen., Kyoto Univ., Kyoto, Japan 12, 27 and 3 F1 hybrids were obtained between Triticum polonicum var. vestitum, T. durum var. Reichenbachii and T. vulgare var. erythrospermum, and Agropyron intermedium, respectively. T. polonicum x A. intermedium: Most characteristics of all F1 plants (2n=35) were intermediate but in several others they resembled the Agropyron parent. Individual variation in some characters such as waxy - somewhat waxy, wide leaf - narrow leaf and slender stem - thick stem etc. were observed. The plants grew vigorously. Pollen sterility was complete but several seeds were obtained from open-pollination and from pollination with pollen of the Agropyron parent. At MI varying conjugation pattern from 5II+25I to 10II+15I was observed. and the average chromosome conjugation was 0.03IV+0.2III+6.8II+20.8I. Most of the bivalents were of open type and only (1-2)II were ring-shaped. T. durum x A. intermedium : AII F1 plants (2n=35) were waxy and had short awns but some variation occurred as to the growth habit. At MI different kinds of chromosome conjugation from 3II+29I to 12II+11I were observed. The average was 0.04IV+0.3III+7.7II+19.5I and 3-4 ring-shaped bivalents were found. T. vulgare x A. intermedium: F1 plants (2n=42) were waxy and had short awns. Most of other characters were intermediate. Pollen- and seed-sterility was complete. Considerable pairing from 8II+26I to 13II+16I was observed at MI, and the average was 0.03IV+0.6III+10.1II+19.8I with ring-shaped (2-3)II. Judging from the occurrence of 7-10 bivalents in the F1 hybrids between three species of Triticum and Agropyron intermedium, homologies among the genomes of A. intermedium may be assumed, and moreover, the possibility of autosyndesis of a few chromosomes among the genomes of Triticum or allosyndesis of a few chromosomes between the genomes of Triticum and those of Agropyron is indicated. |