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Chromosome Stability in the Genus Rhododendron

Karl Sax
American Journal of Botany
Vol. 17, No. 4 (Apr., 1930), pp. 247-251
Stable URL: http://www.jstor.org/stable/2435841
Page Count: 6
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Chromosome Stability in the Genus Rhododendron
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Abstract

Chromosome counts of representative species of Rhododendron show that 13 is the fundamental chromosome number in the genus and this number is found in both the true Rhododendrons and in the Azaleas. Two tetraploid species were found but tetraploidy is not characteristic of any one subgenus or section. Although the genus is very polymorphic the chromosome numbers of representative species are very uniform. Cytological studies of certain hybrids between Oriental and American species show that there is complete or almost complete compatibility of the parental chromosomes in the hybrids, although the parents have probably been separated for millions of years. These results indicate that the chromosomes of Rhododendron are very stable in their genetic constitution.

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