Abstract
An efficient method for the regeneration of zygote-derived plants via ovule culture is desirable for overcoming postzygotic cross incompatibility as well as for the development of certain methods for genetic manipulation. High-frequency plantlet regeneration from ovules of Italian ryegrass (Lolium multiflorum Lam.) and a hybrid Italian/perennial ryegrass excised 1 to 4 days post pollination was obtained by culture on endosperm-derived feeder cells. Ovules excised 3 or 4 days after anthesis and grown on feeder cells generally regenerated about twice as frequently as ovules grown directly on nutrient medium. In one of the genotypes tested, ovules excised 1, 2 and 3 days post pollination developed into plantlets at percentages of 38.1, 52.0 and 52.8, respectively, using the feeder-cell system.
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