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A Case of Spontaneous Reduction of Chromosome Number in Somatic Tissue of Cotton

As a result of pollinating Gossypium hirsutum with pollen of Hibiscus esculentus, a plant containing approximately twice the 2N number of chromosomes of cotton was obtained. Phenotypically and cytologically there are no indications that okra chromosomes have taken part in the development of the... Full description

1st Person: Brown, Meta S.
Source: in American journal of botany Vol. 34, No. 7 (1947), p. 384-388
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Type of Publication: Article
Language: English
Published: 1947
Keywords: research-article
Online: Volltext
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520 |a As a result of pollinating Gossypium hirsutum with pollen of Hibiscus esculentus, a plant containing approximately twice the 2N number of chromosomes of cotton was obtained. Phenotypically and cytologically there are no indications that okra chromosomes have taken part in the development of the variant plant. The absence of typical polyploid characteristics and the low incidence of quadrivalents indicate that despite the approximate 4N number of chromosomes, the chromosomes do not represent an exact duplication of the 2N complex, but a modified assortment. After several seasons, the number of chromosomes was reduced to 2N-1 in a grafted branch. The somatic reduction in chromosome number to a number approximating the normal complex, whether by chance or in response to an unfavorable genotypic environment, represents a mechanism whereby unbalanced plant types may eliminate incompatible chromosomes and thus establish more viable forms. 
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952 |d 34  |j 1947  |e 7  |h 384-388 

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