BGN 3: Occurrence of primary trisomics in the progenies of monotelotrisomics BARLEY GENETICS NEWSLETTER, VOL. 3, II. RESEARCH NOTES
Tsuchiya & Singh, p. 73

II.45. Occurrence of primary trisomics in the progenies of monotelotrisomics.

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

Simple trisomics (2n = 15) were obtained in the progenies of monotelotrisomics for chromosomes 1L 1S, 2L, 2S, 3A, 4A, and 5L. Morphologically, these plants were similar to their respective primary trisomic plants. The frequencies of the occurrence of simple trisomic plants in the selfed progenies of different monotelotrisomics are different in different strains as shown below:

The meiosis of 13 of the 25 primary trisomic plants was studied. In every case no ring trivalents were observed at metaphase I indicating that the trisomic chromosome is not an isochromosome. Secondary trisomic plants are often fcund in the progenies of monotelotrisomics in other organisms.

(Supported partly by NSF Research Grant GB30493 to T. Tsuchiya.)

BGN 3 toc
BGN Main Index