Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: 5/30/2001
Publication Date: 6/29/2001
Citation: PALMER, R.G., BROWN, A.H., SCOTT, M.P., HORNER, H.T. NECTAR PRODUCTION AND FLORAL MORPHOLOGY AND PERENNIAL GLYCINE SPECIES. THE FOURTH INTERNATIONAL LEGUME CONFERENCE. 2001. ABSTRACT P. 65. Interpretive Summary:
Technical Abstract: The Genus Glycine contains the cultivated soybean G. max, the wild annual soybean G. soja, and about 22 wild perennial Glycine species. The perennials are largely indigenous to Australia, but are found in Paupa New Guinea, Timor, Philippines, and Taiwan. Outcrossing by insects occurs at a very low frequency in the cultivated species, generally less than 1%. The annual species has outcrossing from less than 1% to as high as 20%. Outcrossing, as determined by isozyme heterozygosity, in the perennial species G. arygera and G. clandestina varied considerably, but can exceed 50% of the seed from chasmogamous fruit in some situations. Our objective was to determine nectar composition (carbohydrates) and to examine floral morphology of core accessions of glasshouse-grown plants of the perennial soybean. Seventy accessions, representing 19 species, were surveyed. Total carbohydrate concentrations varied among the species by more than three times. Differences were noted within different accessions of the same species and among ploidy levels within a species. Large differences in floral morphology of the standard, wings and keel petals were recorded. The high carbohydrate levels and floral morphology are compatible with entomophilous characteristics that favor insect visitations and result in enhanced levels of cross-pollination.