TITLE

DESCRIPTION OF EXTRAFLORAL NECTARIES FOUND ON YARD-LONG BEANS, VIGNA UNGUICULATA L. WALP

AUTHOR(S)
Headings, Mark E.; Morris, Leslie; Hammel, Jackie
PUB. DATE
March 2008
SOURCE
Ohio Journal of Science;Mar2008, Vol. 108 Issue 1, pA-11
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Floral nectaries commonly occur on many of the flowering plants. Less known are extrafloral nectaries which occur on plant parts outside of the flower. Field investigations were conducted in 2007 with the objective of continuing to screen different types of beans for the presence of extrafloral nectaries. These nectaries provide a food source for nectar-seeking insects, such as certain ants, wasps, flies and beetles. The focus of this investigation is to determine and describe the presence of extrafloral nectaries on yard-long beans (Vigna unguiculata L. Walp. subsp, sesquipedalis L. Verdc.) Yard-long beans, are also classified as Vigna sesquipedalis. Plant material was examined under a Hitachi S-3500 variable pressure scanning electron microscope, from which 32 photos were produced. Extrafioral nectaries were found located on the stems adjacent to where the flower is formed and may be present on both sides of the stem. They appear as distinctly raised structures with one to seven orifices each. A young nectary has a plug in an orifice, and as the nectary matures, the plug is expelled and an additional new orifice, with a plug, is added. This process may continue until there are at least 7 orifices in the nectary. Over the past few years the authors have examined over 40 different types of beans of which three have very similar extrafloral nectaries to that of yard-long beans, namely, mung beans, adzuki beans and cowpeas (California Blackeye No. 5). Also, extrafloral nectaries have been observed on fava beans (Broad Windsor), but they are structurally different and are located on a different plant part.
ACCESSION #
31745934

 

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