Effect of mentor pollen on pistil-pollen incongruities among species of Cucumis L. |
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| Authors: | A P M Den Nijs E H Oost |
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| Institution: | (1) Institute for Horticultural Plant Breeding (IVT), P.O. Box 16, wageningen, the Netherlands |
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| Abstract: | Summary The merits of mentor pollen in certain interspecific hybridizations in the genus Cucumis L. were evaluated. African wild cucumber species Cucumis metuliferus
Naud. and C. africanus L. and Asian species C. sativus var. hardwickii
Alef and var. sikkimensis
Hook, were reciprocally crossed. Pollen tube growth was arrested halfway down the style in all combinations except in C. sativus × C. africanus. Mentor pollen irradiated with 100 and 200 krad grew through the style and into the ovules in all species. Fruitset was obtained in all cases when mentor pollen was used either alone or in mixtures. Fruits set after self pollination with mentor pollen yielded only seeds without embryos.In several crosses, aided by mentor pollen, a number of relatively large seeds (with enlarged embryosac) were obtained. A sample of these embryosacs contained a globular structure like an embryo. Embryosacs with embryo-like structures were explanted on several different media but no development was obtained. |
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| Keywords: | Cucumis sativus wild cucumbers interspecific hybridization mentor pollen gamma-irradiation of pollen |
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