Abstract
Different pretreatments were given to anthers of barley before culturing, and their effects assessed on the frequency of embryos and green doubled haploid plants produced. Mannitol pretreatment was better than cold pretreatment for some low responding cultivars. Optimal concentration of mannitol for pretreatment depended on cultivar. Low responding genotypes needed a higher concentration of mannitol than responsive ones. The addition of Ficoll to liquid medium increased the number of embryos and green plants. The influence of the growth regulators 2,4-D and TIBA was assayed using ten cultivars of barley grown in Spain. The anti-auxin TIBA gave good embryo production with some of the low responding cultivars. Two row-type cultivars always produced higher number of embryos and green plantlets than six row-type. The application of these modifications to 10 F1 hybrids with potential agronomic value, allowed the production of almost 1000 doubled haploid plants from only 3500 anthers. Up to two doubled haploid plants per flower were produced from the cross Monlon × Sonja.
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