Extent of cross-fertilization in Orobanche cumana Wallr. |
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Authors: | M I Rodríguez-Ojeda J M Fernández-Martínez L Velasco B Pérez-Vich |
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Institution: | 1301. Koipesol Semillas S.A. Avda. San Francisco Javier 24-7, 41018, Sevilla, Spain 2301. Instituto de Agricultura Sostenible (IAS-CSIC), Alameda del Obispo s/n, 14004, Córdoba, Spain
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Abstract: | Sunflower broomrape (Orobanche cumana Wallr.) is considered a self-fertilizing species, but there is no indication as to whether it is strictly self-fertilized or that it presents some extent of cross-fertilization. The objective of this research was to measure the rate of cross-fertilization in O. cumana using an unpigmented recessive mutant as a visual marker. A pot and a field experiment in which single unpigmented plants were surrounded by a large number of pigmented plants were conducted. Occurrence of F1 hybrids, readily distinguishable from unpigmented plants in the progenies of unpigmented plants provided a direct measurement of the cross-fertilization rate. Progenies of unpigmented plants contained 21.5 % of F1 hybrids in the pot experiment and 28.8 % in the field experiment. The results revealed that O. cumana is a partially allogamous species, which has great relevance for understanding the genetic structure and dynamics of populations and, ultimately, race evolution in this parasitic plant. |
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