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Morphological and RAPD marker evidence of gene flow in open-pollinated populations of Cucurbita moschata interplanted with C. argyrosperma.
| Content Provider | Semantic Scholar |
|---|---|
| Author | Cuevas-Marrero, H. Wessel-Beaver, Linda Pitrat, Michel |
| Copyright Year | 2008 |
| Abstract | The tropical pumpkins Cucurbita moschata Duchesne and C. argyrosperma Huber are often found growing together. Both C. argyrosperma subsp. argyrosperma (the domesticated cushaw squash) and the wild species C. argyrosperma subsp. sororia (L.H. Bailey) Merrick & Bates are found together in Central America. Several reports indicate that plants displaying a phenotype combining traits of both species occur, suggesting gene flow between species. This research studied gene flow between species by evaluating progenies from field plantings of C. argyrosperma (both subspecies) interplanted with C. moschata and allowed to open-pollinate. The progenies evaluated were from C. argyrosperma seed parents. Morphological and species-specific RAPD markers demonstrated that C. moschata genes were introgressed into these open-pollinated progeny. INTRODUCTION An extensive study by Merrick (1991) of C. argyrosperma (including the domesticated subspecies argyrosperma and the wild or weedy subspecies sororia) concluded that, among the Cucurbita, this species is the most closely related to C. moschata. Hand pollinations between these species result in fertile progeny when C. argyrosperma is used as the seed parent (Merrick 1991; Wessel-Beaver et al. 2004). Both species occupy a similar ecogeographic area of Central American (Whitaker and Davis, 1962). Anecdotal evidence, in the way of reports of intermediate fruit types, suggests that gene flow occurs naturally between these species. Wessel-Beaver (2000) removed all staminate flowers from plants of both C. argyrosperma subspecies planted in a field of C. moschata and allowed open-pollination. All plants of C. argyrosperma produced large numbers of fruit with well-developed seeds. However, the study did not include an evaluation of plants produced from these putative interspecific F1 seeds. The objective of this study was to study naturally open-pollinated progeny from C. argyrosperma interplanted in fields of C. moschata in order to test the hypothesis Cucurbitaceae 2008, Proceedings of the IX EUCARPIA meeting on genetics and breeding of Cucurbitaceae (Pitrat M, ed), INRA, Avignon (France), May 21-24, 2008 |
| Starting Page | 347 |
| Ending Page | 352 |
| Page Count | 6 |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://w3.avignon.inra.fr/dspace/bitstream/2174/231/1/12_47_Wessel_Beaver.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
