CYTOLOGIA
Online ISSN : 1348-7019
Print ISSN : 0011-4545
Cytological Studies an the Peanut, Arachis
I. Chromosome number and morphology
Ladley Husted
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JOURNAL FREE ACCESS

1933 Volume 5 Issue 1 Pages 109-117

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Abstract

1. The somatic chromosomes of what is probably the “Rasteiro peanut” of Chevalier and of ten previously unpublished varieties and lines of A. hypogaea are forty in number.
2. In all forms examined one pair of chromosomes is conspicuously smaller than any of the others of the complement. All the chromosomes possess median primary constrictions. Secondary constrictions are present. There is an indication that the chromosomes of a complement may be separated into classes containing from one to several chromosomes which appear identical in size.
3. The Small chromosomes vary in length from 0.8 to 1.3 microns, the next in size from 1.2 to 1.7 microns, and the largest from 1.9 to 2.7 microns, depending upon the fixative and stain used.
4. The haploid chromosome number of one bunch and two run-ner varieties of A. hypogaea is twenty. Irregular chromosome association has been observed. Secondary association is present.
5. The bunch type and runner type peanuts investigated present the Same chromosome picture. It is concluded that as yet there is no cytological evidence to support Waldron's hypothesis of dual origin.

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© The Japan Mendel Society
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