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Proc Natl Acad Sci U S A

Title:		Grasshopper crop and midgut extract effects on plants: an example of reward feedback
Author(s):		Dyer MI; Moon AM; Brown MR; Crossley DA;
Address:		"Department of Entomology and Institute of Ecology, University of Georgia, Athens, GA 30602, USA"
Journal Title:		Proc Natl Acad Sci U S A
Year:		1995
Volume:		92
Issue:		12
Page Number:		5475 - 5478
DOI:		10.1073/pnas.92.12.5475
ISSN/ISBN:		0027-8424 (Print) 1091-6490 (Electronic) 0027-8424 (Linking)
Abstract:		"Acid extracts and a resultant fraction from solid-phase extraction (SPE) of Romalea guttata crop and midgut tissues induce sorghum (Sorghum bicolor var. Rio) coleoptile growth in 24-h incubations an average of 49% above untreated controls. When combined with plant auxin, indole-3-acetic acid (IAA), the SPE fraction shows a synergistic reaction, yielding increases in coleoptile growth that average 295% above untreated controls and 8% above IAA standards. The interaction lowered the point of maximum sensitivity of IAA 3 orders of magnitude, resulting in a new IAA physiological set point at 10(-7) g/ml. This synergism suggests that contents in animal regurgitants making their way into plant tissue during feeding may produce a positive feedback in plant growth and development following herbivory. Such a process, also known as reward feedback, may exert major controls on ecosystem-level relationships in nature"
Keywords:
Notes:		"PubMed-not-MEDLINEDyer, M I Moon, A M Brown, M R Crossley, D A Jr eng 1995/06/06 Proc Natl Acad Sci U S A. 1995 Jun 6; 92(12):5475-8. doi: 10.1073/pnas.92.12.5475"