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Genetic studies of the pineapple. I. A preliminary report upon the chromosome number and meiosis i n seven pineapple varieties (Ananas sativus Lindl.) and in Bromelia pinguin L

Genetic studies of the pineapple. I. A preliminary report upon the chromosome number and meiosis i n seven pineapple varieties (Ananas sativus Lindl.) and in Bromelia pinguin L

J. Hered 22: 139-42

Twenty-five was found to be the haploid number of chromosomes at meiosis and fifty were observed in dividing cell of the root tip, Meiosis was regular, lagging chromosomes and other abnormalities were rare. Six triploid plants were obtained in the F1 of a cross between Cayenne and a wild Brazilian variety. There were 75 chromosomes and meiosis was irregular. A similar case may account for Heilborn's report of 75 as the somatic number in his material.

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