Abstract
The influence of three environments on chromosome elimination after hybridization between four Hordeum vulgare and two H. bulbosum genotypes was investigated. The hybrid between H. vulgare cv. Emir and H. bulbosum Cb 2929/1 produced highest proportions (51%) of hybrid embryos at low temperatures (<15°C) which retained the H. bulbosum chromosomes. Embryos were also allowed to develop for various durations after pollination at a particular temperature before transfer to a contrasting temperature. Five to nine days were required at 14.5°C to produce increased proportions of hybrids. After 10 days at 14.5°C the proportions of hybrids were not affected by an increase in temperature to 23°C. However, once chromosome elimination had commenced at 23°C (1–2 days after pollination) the process could not be stopped by transfer to 14.5°C. The implication of these effects are discussed.
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