Characterization of interpopulation genetic variability in three hybrid maize populations

Article Abstract:

The additive genetic variance is the most important component of genetic variability for all traits in 3 hybrid maize populations. It increases for plant and ear height and decreases for root and stalk lodging with recurrent reciprocal selection. Heritability increases with recurrent reciprocal selection. Following recurrent selection, all traits show dominance variance component, except for grain yield. Reciprocal recurrent selection is a useful method for enhancing the population cross for yield without reducing genetic variability.

Corn, Plant cytogenetics, Hybrid corn

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Cytomixis in pollen mother cells of diploid Dactylis, one of the origins of 2n gametes

Article Abstract:

A meiotic study of one diploid plant of Dactylis glomerata L. subsp. castellata Borrill and Parker was conducted to verify whether the passage of nuclear material between meiocytes constitutes an effective mechanism for the formation of 2n pollen or if this is simply an abnormal phenomenon, as in other grass species. Results indicate that cytomixis can be an efficient mechanism for the production of 2n gametes, thus, its manifestation can affect the plant's evolution.

Physiological aspects, Plants, Plant morphology, Grasses, Plant evolution, Pollen, Plant chromosomes

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Physical mapping of rRNA genes in Medicago sativa and M. glomerata by fluorescent in situ hybridization

Article Abstract:

Various subspecies of alfalfa (Medicago sativa L.) were studied by fluorescent in situ hybridization to investigate distribution of RNA genes. Results suggest the importance of in situ hybridization for improving karyotype analysis.

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