ARS | Publication request: THREE TYPES OF SOYBEAN GYNOECIAL TRICHOMES VARY IN NUMBER AND DISTRIBUTION AMONG CLARK LINE AND SEVEN NEAR-ISOGENIC LINES

Submitted to: American Society of Agronomy Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: November 4, 2004
Publication Date: November 4, 2004
Citation: Healy, R.A., Horner, H.T., Bailey, T.B., Palmer, R.G. 2004. Three types of soybean gynoecial trichomes vary in number and distribution among clark line and seven near-isogenic lines. American Society of Agronomy Abstracts. Paper No. 1030.

Technical Abstract: Three types of trichomes are present on soybean flower gynoecia from one day prior to anthesis through anthesis. Our objective was to compare trichomes by type, number, form, and location on the gynoecium of cultivar Clark, seven near-isogenic pubescent lines, and tetraploid Clark. The near-iosgenic lines included the glabrous, puberulent, sparse, sharp hair tip, dense 1, dense 2, and extra dense. Clark has long, thin-walled unicellular trichomes and short, 5- to 10-celled secretory trichomes distributed along the ovary. The long, thick-walled trichomes are concentrated at the juncture of the ovary and style on the dorsal side of the gynoecium. The secretory trichomes vary most in number among the seven near-isogenic lines. The role of the trichomes in defense, i.e., protection of the nectary from nectar predators, and in the secretion of compounds for pollinator attraction, and(or) as a repellant of unwanted nectar 'robbers' is under investigation. For example, pollinator preference is being field-studied to determine if certain pubescent-type lines could be used to produce large quantitative of hybrid seed.