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  • Author or Editor: Soad S. Shahin x
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Two species of Zinnia (Z. elegans Jacq. 2n = 24 and 4n = 48; and Z. peruviana (L.) L. 2n = 24) were utilized in a series of crosses in an attempt to develop new types of Zinnia. Embryos were apparently normal and increased in size during the early stages of development, however, during the second week after pollination there was a breakdown of the endosperm cells followed shortly by degeneration of the embryos. By using IAA and embryo culture techniques, mature F1 plants were produced. The F1 hybrids, which resembled Z. elegans more than Z. peruviana, were more vigorous than either parent. They were sterile.

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