Abstract
1) Constancy of karyotypes in barley species are studied in this paper using the following materials:
Hordeum agriocrithon.......wild six-rowed barley, strain No. 309.
Hosogara No. 2......cultivated six-rowed barley, strain No. 21.
Rokkaku No. 1......cultivated six-rowed barley, strain No. 38.
Harbin Nijo......cultivated two-rowed barley, strain No. 144.
2) Each pair of the chromosomes is characterized by its length and shape, and therefore, they are designated as a, b, c, d, e, f and g.
3) Chromosome type of a race or variety is always constant even in the cells of the different plants.
4) Different pretreatment, killing and staining materials do not alter the relative size and form of the chromosomes: when the material was pretreated with some solutions, such as 0.5, 0.75 and 1.0 per cent solutions of chloral hydrate, each of the chromosomes in a haploid set was contracted in equal ratio.
