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Effects of temperature on pollen tube growth and fruit set in reciprocal crosses between cucumis sativus and cucumis metuliferus



Effects of temperature on pollen tube growth and fruit set in reciprocal crosses between cucumis sativus and cucumis metuliferus



Plant Breeding 100(2): 150-153



Interspecific hybridization between Cucumis sativus and C. metuliferus may be used to introduce disease resistance into the cultivated cucumber. Hybrid plant development, however, is restricted by strong barriers to crossing. The present study was undertaken to examine temperature effects on pollen tube growth and fruit set is reciprocal crosses between C. sativus and C. metuliferus. When crossing C. sativus .times. C. metuliferus, at 20.degree. C, pollen tube growth was arrested in the stylar region of the pistil and no fruits containing embryos were found. However, at 23.degree. and 26.degree. C, C. metuliferus pollen tubes penetrated into the C. sativus ovules. The enhanced pollen tube penetration was correlated with improved embryo development. Although pre-fertilization barriers were overcome, post-fertilization barriers caused abortion of hybrid embryo development at the globular stage. No effects of higher temperatures were found in the cross C. metuliferus .times. C. sativus: Pollen tubes were generally arrested in the stylar region of the pistil.

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Accession: 005328981

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