A Cytological Study of Uromyces aloes

1. Uromyces aloes (Cke.) Magn. is a microcyclic rust developing pycnia and telia on the leaves of Aloe vera. The pycnia are subepidermal and remain abortive and underdeveloped in many cases. 2. The telia are subepidermal, and the teliospores germinate readily, producing usually two-celled, and rarel...

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Bibliographic Details
Published in:Botanical gazette (Chicago, Ill.) Ill.), 1946-12, Vol.108 (2), p.245-254
Main Author: Thirumalachar, M. J.
Format: Article
Language:English
Subjects:
Basidiospores
Cell fusion
Cell nucleus
Germination
Haploidy
Hyphae
Infections
Mycelium
Prophase
Teliospores
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Summary:1. Uromyces aloes (Cke.) Magn. is a microcyclic rust developing pycnia and telia on the leaves of Aloe vera. The pycnia are subepidermal and remain abortive and underdeveloped in many cases. 2. The telia are subepidermal, and the teliospores germinate readily, producing usually two-celled, and rarely three-celled, promycelia. The terminal cell, which may thus be bi- or trinucleate, is fertile, while the nuclei in the lower cell, or cells, degenerate. The terminal fertile cell produces an infection hypha which penetrates into the host. Development of basidiospores has not been observed, but the terminal cell of the promycelium assumes the function of basidiospores. 3. A detailed cytological study of teliospore germination has been made. The haploid chromosome number, as determined during the meiotic divisions of the fusion nucleus in the promycelium, is six. In its type of teliospore germination, U. aloes has been shown to resemble Puccinia arenariae, Cintractia montagnei, and others which are considered to be basidially bisporous by Buller.
ISSN:0006-8071
DOI:10.1086/335410