* Supported by USDA-CSU Cooperative Research
Project No. 58-9AHZ-2-265 and CSU Hatch project.
Two plants with two extra telocentric chromosomes for the short arm of chromosome 5 (14 + 2 telo 5S) were found in the selfed progenies of monotelotrisomic 5S (Triplo 5S). The plants grew in the greenhouse. The morphological measurements for various plant parts are shown in Table 1.
Generally, differences, if any, were very minor among diploid, monotelotrisomic and ditelotetrasomic plants for these morphological measurements. However, a distinguished characteristic for ditelotetrasomic 5S (ditelo 5S) was observed in the greenhouse: the ditelo 5S plants showed some onion-shaped (fused) leaves. Some of these leaves rolled up and fused together and the young leaves or spikes were wrapped inside, turning yellow or curly. This phenomenon was observed early by Tsuchiya (1958, 1964, 1967) on primary trisomic for chromosome 1 (Bush), chromosome 2 (Slender), and chromosome 5 (Pseudonormal).
Pollen fertility was fairly good for ditelo 5S plants. The pollen fertilities for diploid, monotelo 5S and ditelo 5S were 98.5%, 96.6% and 91.6%, respectively. Seed fertilities for diploid, monotelo 5S and ditelo 5S were 94.8%, 82.8% and 75.4%, respectively.
References:
Tsuchiya, T. 1958. Studies on trisomics in barley. I. Origin and the characteristics of primary simple trisomics in Hordeum Spontaneum. C. Koch. Seiken Ziho, 9:69-86 (Jap. Eng. resume).
Tsuchiya, T. 1964. Chromosome aberrations and their use in genetics and breeding in barley, trisomics and aneuploids. Proc. Ist Intern. Barley Genet. Symp. (Barley Genetics 1): 116-150.
Tsuchiya, T. 1967. The establishment of a trisomic series in a two-rowed cultivated variety of barley. Can. J. genet. Cytol. 9:667-682.