Puccinia dracunculina life cycle. Stage 0-Pycnia and pycniospores-(a) pycniospores; (b) pycniospores (stained nuclei); (c) pycnia on tarragon leaf, with drop of nectar on each pycnium; (d) transverse section of two pycnia; (e) pycnial cluster surrounded by uredinial sori. Stage 1-Aecia and aeciospores-not found in Israel. Stage II-Uredinia and urediniospores-(f) urediniospores; (g) germinating urediniospores, n+n nuclei in the germtubes; (h) transverse section of a uredinium; (i) uredinial sori on tarragon leaf. Stage III-Telia and teliospores-(j) teliospores; (k) stained teliospores with one diploid nucleus in each telial cell; (l) germinating teliospore with four haploid nuclei (after meiosis) in the basidium; (m) germinating teliospore, with basidium with four sterigmata, the lower two basidiospores still attached; (n) telia on a dry stem; (o) telia on a green stem and on dry leaves. Stage IV-Basidiospores-(p) mononucleate haploid basidiospores.

Contexts in source publication

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... and greenhouse studies of rust life cycle Only a few of the attempts to use induced teliospore ger- mination to infect tarragon plants gave positive results. Generally, one cell of the teliospores germinated; rarely did both produce a basidium (Fig. 1, stage III). The dip- loid nucleus migrated to the basidium (Fig. 1, stage III, l), underwent meiosis and produced four haploid nuclei which later migrated separately to the four basidiospores formed on the basidium sterigmata (Fig. 1, stage III, m). Basidiospores were then ejected, and those falling on a tarragon leaf penetrated the epidermis. ...

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... and greenhouse studies of rust life cycle Only a few of the attempts to use induced teliospore ger- mination to infect tarragon plants gave positive results. Generally, one cell of the teliospores germinated; rarely did both produce a basidium (Fig. 1, stage III). The dip- loid nucleus migrated to the basidium (Fig. 1, stage III, l), underwent meiosis and produced four haploid nuclei which later migrated separately to the four basidiospores formed on the basidium sterigmata (Fig. 1, stage III, m). Basidiospores were then ejected, and those falling on a tarragon leaf penetrated the epidermis. The fungus formed a pycnial cluster (Fig. 1, stage 0, c,d), and uredin- ...

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... gave positive results. Generally, one cell of the teliospores germinated; rarely did both produce a basidium (Fig. 1, stage III). The dip- loid nucleus migrated to the basidium (Fig. 1, stage III, l), underwent meiosis and produced four haploid nuclei which later migrated separately to the four basidiospores formed on the basidium sterigmata (Fig. 1, stage III, m). Basidiospores were then ejected, and those falling on a tarragon leaf penetrated the epidermis. The fungus formed a pycnial cluster (Fig. 1, stage 0, c,d), and uredin- ial sori were produced (Fig. 1, stage II, h,i), surrounding the cluster. However, intensive searching of the tarragon field throughout the study did not reveal any ...

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... migrated to the basidium (Fig. 1, stage III, l), underwent meiosis and produced four haploid nuclei which later migrated separately to the four basidiospores formed on the basidium sterigmata (Fig. 1, stage III, m). Basidiospores were then ejected, and those falling on a tarragon leaf penetrated the epidermis. The fungus formed a pycnial cluster (Fig. 1, stage 0, c,d), and uredin- ial sori were produced (Fig. 1, stage II, h,i), surrounding the cluster. However, intensive searching of the tarragon field throughout the study did not reveal any traces of the pycnial stage (Fig. 1, stage ...

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... meiosis and produced four haploid nuclei which later migrated separately to the four basidiospores formed on the basidium sterigmata (Fig. 1, stage III, m). Basidiospores were then ejected, and those falling on a tarragon leaf penetrated the epidermis. The fungus formed a pycnial cluster (Fig. 1, stage 0, c,d), and uredin- ial sori were produced (Fig. 1, stage II, h,i), surrounding the cluster. However, intensive searching of the tarragon field throughout the study did not reveal any traces of the pycnial stage (Fig. 1, stage ...

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... were then ejected, and those falling on a tarragon leaf penetrated the epidermis. The fungus formed a pycnial cluster (Fig. 1, stage 0, c,d), and uredin- ial sori were produced (Fig. 1, stage II, h,i), surrounding the cluster. However, intensive searching of the tarragon field throughout the study did not reveal any traces of the pycnial stage (Fig. 1, stage ...