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Published in Crop Sci 22:377-380 (1982)
© 1982 Crop Science Society of America
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Genetic Stability of Three Italian Ryegrass Cultivars during Seed Multiplication in Diverse Environments1

C. M. Rincker, R. G. May, H. H. Rampton, C. S. Garrison and J. G. Jean2

The objective of this research was to determine if the genetic stability of three Italian (annual) ryegrass (Loliura multiflorura Lam.) cultivars would be adversely affected by two generations of seed multiplication in five diverse environments. Seed of ‘Wasehikari’, ‘Obahikari’, and ‘Gulf’ ryegrass was increased from a single seed lot of each cultivar at four locations in western USA and one in Japan, with the exception of Gulf which was not increased in Japan. Seed from 14 first and second and one-third generation increases, plus the original seed lot, was used to establish separate progeny evaluation tests at Corvallis, Ore., consisting of 120 spaced-plant populations from each entry. Data were recorded for 14 plant growth characteristics, including response to diseases and seedling fluorescence.

Comparisons in plant growth characteristics and response to diseases between plants from the original seed and first, second, and third generation seed increase progeny showed occasional differences between seed sources and original seed, or between seed sources for a given characteristic. However, no consistent differences occurred between locations, within seed sources, or between generations of increase. Seed of Wasehikari, Obahikari, and Gulf ryegrass can be increased in diverse environments without detrimental shifts in population characteristics.

Key Words: Lolium multiflorum Lam. • Annual ryegrass • Population stability • Genetic shift • Seed production • Seed increases

1 Contribution from ARS, USDA in cooperation with the California, Oregon, and Purdue Agric. Exp. Stns. and the College of Agriculture Research Center, Washington State Univ. Scientific Paper No. 5901 of the latter. This research was part of a project on Forage Seeds Production initiated in 1967 by the U.S.-Japan Conference on the Development and Utilization of Natural Resources (UJNR).

2 Research Agronomists, ARS-USDA, Prosser, WA 99350; Lafayette, IN 47907 (now retired); Corvallis, OR 97331 (now retired); Beltsville, MD 20705 (now retired); and Cheyenne, WY 82001 (formerly Shafter, CA).

Received for publication April 27, 1981.




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Copyright © 1982 by the Crop Science Society of America.