An aneuploid plant for telocentric chromosome 6S in barley*

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

* Supported by USDA-CSU Cooperative Research
Project No. 58-9AHZ-2-265 and CSU Hatch project

Crosses were made between monotelotrisomic 6S and ditelotetrasomic 7S. In Table 1 are shown the chromosome numbers of 23 F₁ plants.

Table 1. Chromosome numbers in F₁ plants from cross between monotelotrisomic 6S and ditelotetrasomics 7S in barley.

One plant was an aneuhaploid (2n = 7 + 1 telo 6S) in F₁ hybrid population. The aneuhaploid plant showed less vigor than all others and died after root cutting for chromosome study.

The aneuhaploid plant might have developed directly from a female gamete fertilized by a pollen grain from the ditelotetrasomic plant. Fertilization of a female gamete by pollen from ditelotetrasomic 7S may have not occurred but the pollen stimulated the female gamete development into a viable embryo.

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