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ARS Home » Midwest Area » Ames, Iowa » Corn Insects and Crop Genetics Research » Research » Publications at this Location » Publication #194647
Title: MULTICELLULAR SECRETORY TRICHOME DEVELOPMENT ON PERENNIAL AND ANNUAL SOYBEAN GYNOECIA

Author
item HEALY, ROSARIA - ISU
item Palmer, Reid
item HORNER, HARRY - ISU

Submitted to: Botanical Society of America Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 8/6/2006
Publication Date: 8/10/2006
Citation: Healy, R.A., Palmer, R.G., Horner, H.T. 2006. Multicellular secretory trichome development on perennial and annual soybean gynoecia [abstract]. Botanical Society of America Abstracts. Paper No. 198.

Interpretive Summary:

Technical Abstract: Multicellular secretory trichomes occur on gynoecia of wild perennial Glycine tomentella, and on the wild annual G. soja, and annual cultivars of G. max. This trichome is similar in all taxa examined, with usually 5 to 6 linearly arranged cells. These trichomes are located along the gynoecium from the base of the ovary to the base of the style, and sometimes along the style as in G. tomentella. They begin developing at least 2 days prior to anthesis, and new trichomes continue to form up through the young seed pod stage. During secretion, the apical 2 to 4 cells have prominent Golgi bodies with large vesicles, and the endoplasmic reticulum has enlarged lumens. Both organelles appear to be involved in the production of an unknown secretory product. The basal 2 to 3 cells become highly vacuolate, and their cytoplasm is nearly devoid of Golgi bodies and extensive endoplasmic reticulum. Secretion begins with the exudation of a product between the plasmalemma and the primary wall. Continued secretion builds up between the primary wall and an outer special, non-cuticularized wall that covers the entire trichome. This latter wall separates from the primary walls of the apical cells. The secretory product is ultimately exuded to the outside, and is visible along the outer surfaces of the secreting trichome and adjacent gynoecium epidermis. Secretion appears to be more common in the perennial than in the annual species examined. These results are compared with similar-looking trichomes on vegetative soybean leaves in an unrelated earlier study.