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This article in AJ

  1. Vol. 62 No. 6, p. 711-714
     
    Received: Sept 27, 1969


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doi:10.2134/agronj1970.00021962006200060008x

Varietal Differences in Crownvetch Cotyledon Size1

  1. G. W. McKee and
  2. M. L. Risius2

Abstract

Abstract

Measurements of 7,439 cotyledons from a like number of seedlings from 49 seed lots of seven varieties and strains of crownvetch, Coronilla varia L., verified the existence of significant varietal differences in cotyledon length (L), width (W), and the derived quantity LW. Cotyledons of the variety ‘Chemung’ were significantly larger than those of the variety ‘Penngift’, with those of ‘Emerald’ being intermediate in size. Temperature, light intensity, and growing medium significantly affected cotyledon size; cotyledons were larger when grown under warm and shaded conditions than when grown under cool and unshaded conditions. Cotyledons had attained their maximum size by the time one to two trifoliolate leaves had expanded. Significant differences in cotyledon size between seed lots of the same variety suggested the influence of environmental conditions during seed development and maturation. Varietal differences in cotyledon size may be of possible competitive significance and of value in varietal characterization.

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