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The Journal of Heredity 1990:81(6):462-467
© 1990 The American Genetic Association 81:462-467

research-article

Production of 2n Pollen in Diploid Ipomoea trifida, a Putative Wild Ancestor of Sweet Potato

G. Orjeda, R. Freyre, and M. Iwanaga

International Potato Center Lima, Peru

Address reprint requests to G. Orjeda, International Potato Center (CIP), P.O. BOX 5969, Lima, Peru.

Abstract

We screened 429 individuals from 31 diploid Ipomoea trifida accessions from different countries of Central and South America for 2n pollen production. Almost 20% of this population was found to produce 2n pollen in different frequencies. The production of 2n pollen is not an isolated incident but a common phenomenon in this taxon. Pollen diameter was measured in normal and 2n pollen-producing clones. The diameter of 2n pollen is 30% larger than that of normal pollen, making it very easy to detect 2n pollen producers and measure their frequency. Production of 2n pollen was confirmed by the finding of dyads and triads in anther samples at the tetrad stage of meiosis. Furthermore, Ax individuals were found among progenies of 4x x 2x crosses, providing direct evidence of 2n pollen production in the diploid male parent. The occurrence of 2n pollen in 2x I. trifida provides a clue to understanding how polyploidization and gene flow between different ploidy levels can occur in nature. These findings are discussed in relation to the origin of the polyploid series in this species and of the cultivated sweet potato, I. batatas.


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This article has been cited by other articles:


Home page
 J HeredHome page
L. A. Becerra Lopez-Lavalle and G. Orjeda
Occurrence and Cytological Mechanism of 2n Pollen Formation in a Tetraploid Accession of Ipomoea batatas (Sweet Potato)
J. Hered., May 1, 2002; 93(3): 185 - 192.
[Abstract] [Full Text] [PDF]


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