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Gardner, D. E. 1981. Nuclear behavior and clarification of the spore stages of Uromyces koae. Canadian Journal of Botany 59:939-946.

ABSTRACT
Recent observations showed that Uromyces koae Arthur in Stevens te1iosporesdid not produce typical basidia or basidiospores. The present study reveals that te1iospores produced long germ tubes that are differentiated into wide proximal and narrow distal portions separated by a vesiclelike swelling. One or two extensive branches, each morphologically resembling the main tube, developed from individual germ tube cells. Nuclear staining revealed a single, presumably diploid nucleus in mature teliospores. One or more probable mitotic divisions in the main germ tube provided a diploid nucleus for each branch and for the main tube itself. Meiotic division of each nucleus produced a series of four smaller nuclei in the narrow portion of each branch and the main tube. The germ tubes may be modified basidia and serve as infectious hyphae in place of basidiospores. A formerly undescribed spore type associated with the teliospores is recognized as uredinial. This investigation shows that the life cycle of U. koae probably consists of four distinct stages, each on Acacia koa: the spermatial associated with the aecial on hypertrophied shoots, and the uredinial and telial together in discrete leaf pustules.

FULL TEXT
Full text not available for this publication.

HOSTS
Acacia koa - Koa

PATHOGENS
Uromyces koae - Rust

RELEVANT TO BIOCONTROL
No.

KEY WORDS
Acacia koa, Uromyces koae.

IMAGES
10_031 -- microscope view 10_031 - microscope view
PATHOGEN: Aspergillus melleus
10_034 -- Atelocauda digitata urediniospores from leaf pustule, Waimea Falls, Oahu 10_034 - Atelocauda digitata urediniospores from leaf pustule, Waimea Falls, Oahu
PATHOGEN: Aspergillus melleus
10_035 -- Atelocauda koae germ tube 10_035 - Atelocauda koae germ tube
PATHOGEN: Aspergillus melleus
27_045 -- (Endoraecium hawaiiense) binucleate spore and pedicle, Palolo Valley Oahu 27_045 - (Endoraecium hawaiiense) binucleate spore and pedicle, Palolo Valley Oahu
PATHOGEN: Aspergillus melleus
27_046 -- 27_046 - "Uraecium" binucleate spore and pedicel
PATHOGEN: Aspergillus melleus
27_047 -- Palolo Valley - non germ tube 27_047 - Palolo Valley - non germ tube
PATHOGEN: Aspergillus melleus
27_048 -- Endoraecium diploid nucleus? 27_048 - Endoraecium diploid nucleus?
PATHOGEN: Aspergillus melleus
27_049 -- y meiotic nuclei and septum, Palolo Valley Oahu 27_049 - y meiotic nuclei and septum, Palolo Valley Oahu
PATHOGEN: Aspergillus melleus
27_050 -- y meiotic nuclei, Palolo Valley Oahu 27_050 - y meiotic nuclei, Palolo Valley Oahu
PATHOGEN: Aspergillus melleus
27_051 -- four meiotic nuclei in Atelocauda koae 27_051 - four meiotic nuclei in Atelocauda koae
PATHOGEN: Aspergillus melleus
27_052 -- Atelocauda koae teliospore germ tubes appearing to enter phylloda stomata 27_052 - Atelocauda koae teliospore germ tubes appearing to enter phylloda stomata
PATHOGEN: Aspergillus melleus


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