Journal
ENTOMOLOGIA EXPERIMENTALIS ET APPLICATA
Volume 97, Issue 2, Pages 203-210Publisher
KLUWER ACADEMIC PUBL
DOI: 10.1046/j.1570-7458.2000.00731.x
Keywords
EPG; stylectomy; phloem amino acids; nitrogen; aphid-plant interaction
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Effects of nitrogen deficiency in hydroponically grown barley seedlings (Hordeum vulgare L.) on the development and reproduction of the aphid Rhopalosiphum padi (L.) (Hemiptera: Aphididae) were investigated. Plant growth was significantly reduced in seedlings grown without nitrogen. Aphid intrinsic rate of increase (r(m)) was also significantly lower on these plants compared with that on plants grown with 8 mol m(-3) nitrogen. Phloem sap was collected from seedling stems by aphid stylectomy and amino acids quantified by HPLC. There was a significant reduction in the concentration of non-essential amino acids as a group, but not of essential amino acids. Electrical penetration graphs (EPG) indicated that aphids reached the phloem more quickly and fed for longer on plants grown with nitrogen. This is the first reported study in which this combination of techniques has been used to understand the interactions of an aphid and plant under different environmental conditions.
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