Effect of chromosomes 1B and 6B on nucleolus formation in hexaploid triticale

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Abstract
Nucleolus organizers present on wheat chromosomes 1B and 6B were solely responsible for nucleolus formation in root-tip cells of hexaploid triticale (.times. Triticosecale Wittmack). The distribution of total nucleolar volume among these active nucleolus organizers was more uniform in some triticales than in others. Further differences were found in the distribution of nucleolar volumes when monosomic 1B was compared with monosomic 6B of the same line of triticale. In ''Rosner'', monosomy for 1B seemed to involve the loss of a larger nucleolus than monosomy for 6B. In line 110 the reverse was true but the difference between monosomics in this line was less pronounced. Depending on the line of triticale involved, either chromosome 1B or chromosome 6B organized larger nucleoli.

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