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Effects of Two Diverse Environments on Seed Production Characteristics of Tall Fescue Hybrid Derivatives¹

Panicle emergence, anthesis and several components of seed yield of 42 S₁ (Lolium perenne L. x Festuca arundinacea Schreb.) x Festuca arundinacea Schreb. hybrid clones, grown at Prosser, Washington, and Lexington, Kentucky, were studied in two different years to evaluate seed production capabilities in widely diverse environments.

Clones differed at both locations for time of panicle emergence, date of anthesis, percent fertile pollen, number of panicles per clone, seed yield per clone, seed yield per panicle, percent fertile florets, and weight of 100 seeds. Total panicle production per plant at Prosser was approximately nine times greater than at Lexington, a factor that helped to explain the higher seed yields obtained at Prosser during both years.

The widely diverse environments resulted in significant differences between locations and significant clone and location interactions for most characters studied.

A correlation analysis between locations of means for characters of the 42 individual clones showed a highly significant association during both years for: (a) percent fertile pollen (r=0.87, r=0.80); (b) percent fertile florets (r=0.83, r=0.77); (c) seed per panicle (r=0.79, r=0.71); and (d) total seed yield per clone (r=0.67, r=0.72).

Key Words: Clone • Panicle emergence • Anthesis • Components of seed yield

² Research Agronomists.

³ Research Plant Physiologist, Plant Science Research Division, Agricultural Research Service, U.S. Department of Agriculture, University of Kentucky, Lexington, Kentucky 40506; Prosser, Washington, 99350; Fargo, North Dakota, 58102 and Beltsville, Maryland, 20705.

Received for publication May 17, 1971.