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Embryological Study of Reproductive Barriers in InterspecificCrosses Between Carica Papaya L. and C. Cauliflora Jacq.
|Title:||Embryological Study of Reproductive Barriers in InterspecificCrosses Between Carica Papaya L. and C. Cauliflora Jacq.|
|Authors:||Wenslaff, Timothy Frank|
|Abstract:||The nature of sexual incompatibility between C. papaya L. and C. cauliflora Jacq. was examined. Pollen tube fluorescent staining studies revealed no inhibition of pollen tube development. Serial sections of developing hybrid-crossed ovules revealed significant postzygotic abnormalities, with reciprocal hybrid differences. On C. papaya females pollinated by C. cauliflora, embryos aborted at a microscopic, undifferentiated stage beginning about the 45th day, normal endosperm was lacking, and intact pollen tubes persisted a shorter time than in intraspecific ovules. On C. cauliflora females pollinated by C. papaya, abortion was evident in some ovules by the 45th day, but in others polyembryony was observed, with differentiation ranging from none to fully differentiated. A minority of mature seeds yielded large, fully-formed multiple embryos; there appeared to be potential for ^ vitro germination. No endosperm was found. All embryos in both reciprocal hybrid crosses appeared to derive from the hybrid zygote, based on their orientation and location in the ovule.|
|Appears in Collections:||
M.S. - Horticulture|
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