Abstract
The efficiency of two embryo rescue techniques, direct ovule culture and ovary-slice culture followed by ovule culture, is studied in crosses with Tulipa gesneriana as maternal genotype. The germination percentages increased, in most cases, significantly with increasing ages of te ovary-slices and ovules at the start of the cultures. The low number of embryos recovered at early culture dates is caused by a higher rate of embryo abortion and by retarded embryo development. The germination percentages for ovary-slice culture followed by ovule culture was mostly comparable to direct ovule culture. Unique hybrids have been obtained from the crosses T. gesneriana × T. agenensis and T. gesneriana × T. praestans.
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