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Published in Crop Sci 6:147-150 (1966)
© 1966 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Seedling Vigor and the Early Nonphotosynthetic Stage of Seedling Growth in Grasses1

R. Derwyn B. Whalley, Cyrus M. McKell and Lisle R. Green2

Several species of grasses which have different ratings for seedling vigor were examined for rapidity of germination, seedling growth rates in the dark, and the ultimate length of dark grown seedlings. These are attributes which could be of importance in seedling vigor during the early, nonphotosynthetic stage of seedling growth.

Extreme rapidity of germination largely accounts for the high seedling vigor of Schismus arabicus. In three species and strains of Phalaris, there were indications that rapidity of germination and mean seedling growth rates paralleled their rating for seedling vigor. No relation appeared to exist between total seedling length adjusted to a common seed weight and rating for seedling vigor.

1 Part of a project carried out under a cooperative agreement, Supplement No. 83 to Contract No. A5fs-16565, between the Agronomy Department, University of California, Riverside, and Pacific Southwest Forest and Range Experiment Station, U.S. Forest Service, USDA, Riverside. Part of a thesis submitted by the senior author in fulfillment of the requirements for the Ph.D. degree in Plant Science. Received Oct. 14, 1965. Paper No. 1674, University of California Citrus Research Center and Agricultural Experiment Station, Riverside, California.

2 Lecturer in Botany, University of New England, Armidale, N.S.W., Australia; Associate Professor of Agronomy, University of California, and Research Range Conservationist, Pacific Southwest Forest and Range Experiment Station, U.S. Forest Service, Riverside, Calif.




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