FERTILIZATION AND EMBRYO DEVELOPMENT IN WHEAT×PEARL MILLET WIDE CROSSES
Zhang Yanli;Zhao Yunyun; and Wang Jinglin(Department of Biology, Capital Normal University, Beijing 100037)
The fertilization and embryo development in crosses of Triticum carthlicum (wheat)×Pennisetum americanum (pearl millet) and Triticum aestivum L.cv. "Chinese Spring"(wheat) × Pennisetum americanum (pearl millet) were studied.The pearl millet pollenreadily germinated on the wheat stigma and more than one pollen tubes grew into thestyle and entered the embryo sac. Of 207 ovaries of Triticum carthlicum after pollination 11.11% had embryo and endosperm, 7. 25% had only embryo and 1.93% had only en-dosperm. The frequencies of fertilization and embryo productivity in this crosses were20. 29% and 18. 36%. Of 167 ovaries of "Chinese Spring" after pollination 2. 99%,5. 99%, 0. 8, 98% and 8. 98% were the related figures. The hybrid embryos and en-dosperms obtained were karyotypically unstable and characterized by rapid eliminationof the pearl millet chromosomes to produce haploid wheat embryos. But the embryosdied young because of no endosperms or endosperms abortion. The factors influencedfrequency of fertilization and the potentials for wheat haploid production by eliminationof the pearl millet chromosomes and transfer of DNA segments from pearl millet are dis-cussed.