II.33. Ditelotetrasomic plants in barley.
R. J. Singh and T. Tsuchiya, Department of Agronomy, Colorado State University, Fort Collins, Colorado 80521, USA.
Ditelotetrasomic plants have already been reported for telo-1S (Fedak and Helgason, 1970) and for telo 4S (Tsuchiya and Singh, 1972). Ditelotetrasomic plants were obtained in the F2 populations of monotelotrisomics for 2L, 2S and 3S. The frequency of the occurrence of ditelotetrasomic plants was higher in the cross of telo 2S x gs6 than other cross combinations of telo 2S, telo 2L, and telo 3S (Table 1).
Morphological measurements were not conducted because the material was of hybrid nature. However, ditelotetrasomic plants for telo-2S were generally weaker than monotelotrisomics and diploid sibs, showed narrow leaves, short and thin leaves and stems. The ditelotetrasomic plant for telo-2L was very weak with very thin, small and narrow leaves. The plant is very slow in growth. This indicates that the long arm (telo 2L) has a more deleterious effect on viability of plants than the short arm (telo 2S). Ditelotetrasomic plant for telo 3S was also weaker than monotelotrisomic 3S. At meiotic metaphase I, 1IV + 6II and 8II have been observed in ditelotetrasomic 3S.
References:
1. Fedak, G. and S. B. Helgason. 1970. Can. J. Genet. Cytol. 12:553-559.
2. Tsuchiya, T. and R. J. Singh. 1972. BGN 2:100.
The research work reported in the papers No. II.33, II.34 (p. 65-69) and II.37 (p. 76) through II.42 (p. 90) by T. Tsuchiya and associates was partly supported by NSF Research Grant GB 30493 and Colorado State University Experiment Station Project (Hatch 8).
