A Database for Triticeae and Avena
II. 15. Additional information on the characteristics of telotrisomic
3S in barley. (1)
T. Tsuchiya, R. J. Singh and A. Shahla, Department of Agronomy, Colorado
State University, Fort Collins, Colorado 80523, U.S.A.
(1) Supported by USDA/SEA Competitive Research Grant 5901-0410-9-0334-0
and USDA/SEA Cooperative Research Grant 12-14-5001-265 and CSU Hatch project.
Backcrosses were made to the original Triplo 3S which was obtained in
the progeny of a novel compensating partial tetrasomic diploid plant (2n
= 13 + 1 acro 3L3S + 1 telo 3S) (Singh and Tsuchiya, 1981a,b).
In one backcross progeny a primary trisomic plant (Triplo 3) was obtained
in addition to Triplo 3S and diploids. Some measurements of several plants
organs were made with the results shown in Table 1.
Table 1. Characteristics of Triplo 3S compared to
normal diploid and Triplo 3 in barley.
These observations are not final, but serve as a measure to identify
these materials during their growth.
Except for its smaller size, Triplo 3S is rather similar to the normal
diploid in its gross morphological characteristics with almost normal green
plant color compared to pale green in Triplo 3 and Triplo 3L. Spike shape
is normal with slightly fewer seeds per spike compared to the extremely
compact spike in Triplo 3 and Triplo 3L.
The pollen fertility of Triplo 3S was 92.8% compared to 95.1% in the
diploid. Seed set was also high in selfing (95.0%).
Meiotic chromosome behavior was studied at metaphase I with the results
shown in Table 2.
Table 2. Meiotic chromosome configurations at metaphase
I in Triplo 3S compared to Triplo 3L and Triplo 3 (primary).
Apparently the long arm (Triplo 3L) showed higher frequency of complicated
trivalent type (ring-and-rod with three chiasmata). The primary trisomic
plant (Triplo 3) showed even higher frequency of more complicated trivalent
Singh, R. J. and T. Tsuchiya. 1981a. BGN 11:66-68.
Singh, R. J. and T. Tsuchiya. 1981b. BGN 11:69.
Singh, R. J. and T. Tsuchiya. 1981c. Bot. Gaz. 142:267-273.
Tsuchiya, T. 1967. Can. J. Genet. Cytol. 9:667-682.
BGN 12 toc
BGN Main Index