Graduate Thesis Or Dissertation
 

Studies on the germination and growth of Anisogramma anomala Peck (Muller) in vitro

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  • This study examined the effects of pH, temperature, washing, and post-hydration drying on germination of Anisogramma anomala ascopores. Spores germinate most readily in the temperature range of 5 to 15 degrees C, with an optimal temperature of 10 degrees (1 sd=0.05). Growth was best in the pH range of 5 to 6. Washed ascopores germinate at significantly higher rates than unwashed spores (P=.05, .01, and .06 for three experiments). Germination rate declined sharply with increasing post-hydration drying, with 5 minutes of drying resulting in a 45% reduction in germination. After one hour of drying, spore germination was reduced by 98.5%. Those environmental factors which were optimal for germination in vitro reflected prevailing field conditions during the natural host infection period. The growth of A. anomala on artificial meduium is described. The germination process includes the following series of events: (1) spore hydration and swelling, (2) emergence of the germ tube, (3) vesicle formation, (4) production of hyphal initials, and (5) hyphal growth. Attempts to maintain cultures of A. anomala for longer than several months were unsuccessful.
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file details LightfootRichardT1986.pdf 2017-08-16 Pubblico Scaricare