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The developmental stage of inactivation of rye origin rRNA genes in the embryo ...
Castilho, A.; Queiroz, A.; Neves, N.; Barão, A.; Silva, M.; Viegas, W.To identify the developmental stage during which the preferential inactivation of rRNA genes from the rye parent occurs in wheat x rye hybrids, nucleolar activity was evaluated in the embryo and endosperm of developing seeds of the hybrids. The hybrids were obtained from crosses of euploid and aneuploid lines of hexaploid wheat, Triticum aestivum cv. Chinese Spring, with rye, Secale cereale cv. Centeio do Alto....
Reprogramming of rye rDNA in triticale during microsporogenesis
Silva, M.; Queiroz, A.; Neves, N.; Barão, A.; Castilho, A.; Morais-Cecilio, L.; Viegas, W.To test the hypothesis that interspecific genomic and chromosome interactions leading to nucleolar dominance could be reprogrammed in meiosis, we compared the expression of distinct nucleolar organizing region (NOR) loci in hexaploid triticale root tip meristematic cells, pollen mother cells and young pollen grains. Interphase and metaphase cells were silver stained to quantify nucleoli and active NOR loci resp...
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