Pant Growth Hormones in Ether Extracts of the Greenbug, Toxoptera graminum, and the Pea Aphid, Macrosiphum pisi, Fed on Selected Tolerant and Susceptible Host Plants1
Authors: MAXWELL, FOWDEN G.; PAINTER, REGINALD H.
Source: Journal of Economic Entomology, Volume 55, Number 1, February 1962 , pp. 57-62(6)
Publisher: Entomological Society of America
Abstract:Free auxins were detected and identified in extracts of homogenized aphids using paper chromatography in conjunction with a modified Avena coleoptile bioassay method. Variations in auxin content of extracts of the green bug, Toxoptera graminum (Rondani), and pea aphid, Macrosiphum pisi (Harris) feeding un susceptible or tolerant hosts were measured and possible relationship to the tolerance component of resistance investigated.
The following auxins were detected in significant amounts and identified by RF values in the extract of the aphids feeding on the following susceptible and tolerant hosts: (1) susceptible Reno barley—3-indoleacetic acid (IAA), 3-indolebutyrie acid (IBA); (2) tolerant Dicktoo barley—auxins not present in significant amounts; (3) susceptible Pawnee wheat—indolepyruvic acid (IPA); (4) tolerant Dickinson wheat—auxins not present in significant amounts, growth inhibition present
Extract of pea aphids that had previously fed on susceptible broad bean tissue contained 3-indoleacetic acid (IAA) in significant amounts.
Auxins were found in significant amounts in extract of aphids that had fed on susceptible plants hut absent in aphids fed on tolerant varieties.
Auxins present in green bugs and pea aphids were significantly reduced by a short starvation period prior to analyses, which indicated that auxins present in aphids were plant derived rather than synthesized by the aphids. NO evidence that insects can produce auxins was found
Determining growth substances present in the salivary' glands of aphids would provide valuable information as to whether the toxin in salivary juices are plant-derived axons or inhibitors in toxic concentrations or whether the toxins have their source from pertinacious material synthesized by the aphids.
The tolerance component of resistance is closely associated with the free-auxin content of plants and the ability of certain aphids to extract and concentrate these growth substances.
Document Type: Research Article
Publication date: 1962-02-01
- Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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