Previous View
 
APSnet Home
 
Phytopathology Home


VIEW ARTICLE

Ecology and Epidemiology

Effect of Temperature, pH, Light, and Desiccation on Teliospore Germination of Tilletia indica. J. L. Smilanick, Research associate, Crops Research Laboratory, U.S. Department of Agriculture-Agricultural Research Service, Logan, UT 84322; J. A. Hoffmann(2), and M. H. Royer(3). (2)Research plant pathologist, Crops Research Laboratory, U.S. Department of Agriculture-Agricultural Research Service, Logan, UT 84322; (3)Research plant pathologist, Plant Disease Research Laboratory, USDA-ARS, Frederick, MD 21701. Phytopathology 75:1428-1431. Accepted for publication 7 June 1985. Copyright 1985 The American Phytopathological Society. DOI: 10.1094/Phyto-75-1428.

Maximal germination (55- 60%) of teliospores of Tilletia indica from both Mexico and India occurred after 3 wk of incubation at 15- 20 C in continuous light (30 μEm-2s-1, cool-white fluorescent) over a pH range of 6.0- 9.5. Germination rate and maximum was similar on soil, soil extract agar, and water agar. The promycelia of teliospores germinating under 2 mm of soil or agar were incapable of reaching the surface; presumably, they could not release the wheat floret-infecting sporidia which are necessary to complete the life cycle. Teliospore germination resumed unhindered after a 1- or 3-wk interruption by freezing (- 5 C) or desiccation. Teliospores collected from newly mature wheat spikes germinated poorly (<10%), but increased to 40- 60% over a 4-mo period.