Submitted to: Botanical Society of America Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 6/6/2001
Publication Date: 8/10/2001
Citation: PALMER, R.G., BROWN, A.H., SCOTT, M.P., HORNER, H.T. A SURVEY OF WILD PERENNIAL GLYCINE SPECIES TO ASSESS NECTAR PRODUCTION, COMPOSITION AND FLORAL MORPHOLOGY. BOTANICAL SOCIETY OF AMERICA ABSTRACTS. 2001. Abstract No. 326.
Technical Abstract: One of the limitations for the commercialization of hybrid soybean is the low level of cross-pollination in seed production fields. Insect- mediated cross-pollination is the method of choice but limited information is available in soybean on insect/flower attraction. Out- crossing in the wild perennial soybean species, Glycine arygera and G. clandestina varied considerably, but can exceed 50% of the seed from chasmogamous fruit in some situations. Our objective was to survey the wild perennial Glycine species to assess nectar production and composition and floral morphology. About 70 accessions representing 19 species for the perennial soybean were studied. Measurements for the standard, wings and keel petals of two flowers per accession were taken. Nectar was collected from flowers by the use of capillary tubes. Sugar concentration was measured with a refractometer and by chemical determinations. Large differences in floral morphology of the standard, wing and keel petals were recorded. Total sugar concentrations varied among the species by 3 fold. Differences were noted among accessions of the same species and among ploidy levels within a species. The high sugar levels and floral morphology are compatible with entomophilous characteristics that favor insect visitations. The result is enhanced levels for cross-pollination.