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Genetic and Environmental Effects on Quantity and Quality of Alfalfa Nectar¹

The quantity of nectar per floret and the principal nectar sugars of four alfalfa (Medicago sativa L.) clones were studied under two controlled temperature regimes. One regime was a constant 25 C and the other was an alternating diurnal temperature regime ranging from 18 to 32 C. Clones varied significantly in volume of nectar per floret, percent total nectar sugar, and ratios of suerose: fructose and glucose:fructose. Temperature regimes significantly affected quantity of nectar per floret, percent total nectar sugars, and the ratios of sucrose: fructose and sucrose:glucose. Time of day did not affect any nectar trait. Samples taken between early morning and midafternoon appeared to be least affected by environmental factors.

Key Words: Medicago sativa L. • Nectar sugars

² Former undergraduate student, Department of Agronomy and Plant Genetics; Research Geneticist, ARS, USDA; and Professor, Department of Entomology, Fisheries, and Wildlife, respectively.

Received for publication June 21, 1973.