BGN 2: Ditelotetrasomic plant for telocentric chromosome 4 S in barley BARLEY GENETICS NEWSLETTER, VOL. 2, II. RESEARCH NOTES
Tsuchiya and Singh, p. 100

II.38. Ditelotetrasomic plant for telocentric chromosome 4 S in barley.

T. Tsuchiya and R. J. Singh. Department of Agronomy, Colorado State University, Ft. Collins, Colorado 80521, U.S.A.

*Reports II.33. (p.80) through II.42. (p.108) by T. Tsuchiya and co-workers are based on the results of researches supported by NSF Research Grants GB4482X and GB30493 and Colorado State University Experiment Station Project (Hatch 8).

A new ditelotetrasomic plant was obtained for telocentric chromosome 4S (telo 4S) in the progeny of a cross between telotrisomic 4S x iV. Fifteen crossed seeds germinated giving the following results: 12 (2n=14), 2 (2n+1 telocentric) and 1 (2n=14 + 2 telocentric). From the morphological traits it was assumed that one monotelotrisomic and the ditelotetrasomic plants were derived from selfed seeds. These two plants were used in this study. The ditelotetrasomic plant showed emphasized expression of diagnostic traits of the monotelotrisomic plant for telo 4S. The morphological measurements of the ditelotetrasomic plant together with the monotelotrisomic plant are presented in Table 1.

Table 1. Measurement of various organs of ditelotetrasomic and monotelotrisomic plant.

From the table it appears that the ditelotetrasomic plant is less vigorous than montelotrisomic plants. The seed fertility of the ditelotetrasomic plant was very low.

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