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Embryo culture techniques are employed to germinate seed of early ripening peach and nectarine (Prunus persica (L.) Batsch) cultivars. Generally, the embryos in these genotypes do not mature by the time the fruit matures, thus rendering normal stratifica- tion procedures ineffective. In 1998 and 1999, immature embryos from multiple peach genotypes were cultured in an embryo rescue medium (Woody Plant Medium, 3% sucrose, 0.065% agar) at 5 °C for 45 days in the dark. Embryos were then placed under lights at either a cool-temperature (18 °C in 1999 and 20 °C in 1998) or a warm-temperature (30 °C in 1999 and 28 °C in 1998) treatment with a photoperiod of 12 hours for germination and initial growth. After 2-4 weeks, embryos were rated for germination, root number, and top growth. The embryos incubated at the cool-temperature regime not only had better germination, but also had a higher rate of greenhouse survival.

Cooler Temperature During Germination Improves the Survival of Embryo Cultured Peach Seed