GrainGenes

II. 22. New telosomic and acrosomic trisomics in barley. (1)

Elizabeth Furst and T. Tsuchiya, Department of Agronomy, Colorado State University, Fort Collins, Colorado 80523, U.S.A.

(1) Supported by USDA/SEA Competitive Research Grants No. 5901-0410-9-0334-0 and No. 82-CRCR-1-1020 to T. Tsuchiya, and CSU Hatch Project.

Two or possibly three telotrisomics and two acrotrisomics have been obtained in the progenies of primary trisomics. In Table 1 is shown the type of trisomic, origin and source.

Table 1. Origin and source of five new trisomic types in barley.

All these trisomic plants were obtained in the progenies of primary trisomic plants. Some were in the progenies of pure stocks of SE 16 trisomics, and others were in the F1 or F2 populations.

Triplo 4L: Telotrisomic plants were obtained in an F2 population derived from a cross between Triplo 7 and CSU B8-9. The extra chromosome appears to be 4L based upon plant morphology which is similar to Triplo 4 and Triplo 4L. Giemsa staining and genetic analysis will reveal the identify of this chromosome. The pedigree of the telotrisomic for 4L is as follows:

SE 72-2-23 (2n=15) Triplo 7 -> SE 81-2-15 (2n=15) Triplo 7 X CSU B8-9 -> Itr 82-50-1 (2n=14 + 1 telo) -> II tr 82-35; 30 out of 86 plants were 2n=14 + 1 telo

(2n = 14 + 1 telo   30 plants)
(2n = 14    55 plants)
(2n = 15    1 plant)

Triplo 5S(3L)?: A telotrisomic plant was found in the progeny of SE 81-30-14, a primary trisomic for Triplo 5 and an offspring of SE 77-15-12. Since the telotrisomic plant was obtained in the progeny of the primary trisomic for chromosome 5 (Triplo 5) and the extra chromosome was rather short, the extra telocentric chromosome was considered to be the short arm of chromosome 5 (telo 5S). However, the morphological characteristics of the telotrisomic plants in the progeny of the original telotrisomic (SE 81-30-14) resemble the telotrisomic for chromosome 3L. Since the telocentric chromosome seems to be much shorter than any arm of chromosome 3, it is assumed to have a deficiency. Nature of the telocentric chromosome should be definitely determined by Giemsa staining technique and genetic analysis.

Triplo 7S: Two telotrisomic plants were obtained in an F2 population derived from a cross between Triplo 7 and Utah T41. The extra chromosome is believed to be Telo 7S, based on chromosome and plant morphology. The pedigree of the telotrisomic 7S is as follows:

Since a telotrisomic line for 7S (Triplo 7S) has already been reported (Shahla and Tsuchiya, 1982, 1983), this is the second line of Triplo 7.

Acrotrisomic 4B: An acrotrisomic plant was obtained from stock seed of the primary trisomic plant of Triplo 4 (SE 80-40-19) which was an offspring of SE 79-8-17. The extra chromosome appears to be an acrotrisomic for chromosome 4 based on chromosome morphology. However, this has not been confirmed genetically or by Giemsa staining.

Acrotrisomic 7S^7L: An acrotrisomic plant was obtained in an F2 population derived from a cross between Triplo 7 and Utah T41. The extra chromosome is believed to be an acrocentric chromosome of 7S^7L, based on chromosome and plant morphology. The chromosome possesses a small satellite on its short arm, appearing much like the satellited arm of chromosome 7, and also contains a small piece of another arm. The pedigree of the acrotrisomic 7S^7L is as follows:
 

References:

Shahla, A. and T. Tsuchiya. 1982. Cytogenetics of the telotrisomic for chromosome 7S in barley. 1982 Agron. Abst.:83.

Shahla, A. and T. Tsuchiya. 1983. Additional information on the Triplo 7S in barley. BGN 13:22-23.

BGN 13 toc
BGN Main Index