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Seedling Vigor of Open-Pollination Progenies of Intra- and Inter-Source Crosses of Birdsfoot Trefoil, Lotus corniculatus L.¹

Seedling vigor traits of open-pollination seed from F₁ plants of crosses within and between two diverse germplasm sources of birdsfoot trefoil (Lotus corniculatus L.) were studied under nonphotosynthetic conditions in a germination chamber. Parents of F₁ plants were derived from ‘Empire’ and two Russian introductions. Seedling vigor (as measured by dry weight, hypocotyl length, radicle length, and total seedling length) was positively associated with seed size (r values ranged from 0.47 to 0.87). Progenies of crosses between the Empire and Russian sources exhibited a 5% increase in hypocotyl length at 7 days when compared with the average of progenies of intrasource crosses. Heterosis was not manitested for radicle length or seedling dry weight. Progenies of Empire crosses were superior in those two traits.

Key Words: Seedling dry weight • Hypocotyl length • Radicle length • Seed size • Heterosis • Genetic diversity

² Former Research Associate and Associate Professor of Agronomy, Iowa State University, Ames 50010.

Received for publication December 23, 1972.