Probing behavior of the greenbug (Schizaphis graminum, biotype C) on resistant and susceptible varieties of sorghum

Campbell, B.C. and McLean, D.L. and Kinsey, M.G. and Jones, K.C. and Dreyer, D.L. (1982) Probing behavior of the greenbug (Schizaphis graminum, biotype C) on resistant and susceptible varieties of sorghum. Entomologia Experimentalis et Applicata, 31 (2). pp. 140-146.

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The probing behaviour of biotype C of Schizaphis graminum (Rond.) on susceptible and resistant lines of sorghum was electronically monitored. Waveforms corresponding to salivation, phloem ingestion and non-phloem ingestion are described. The results of a parallel study revealed that the rate of population growth of S. graminum was significantly greater on susceptible lines of sorghum (i.e., NC + 70X, SC423 (Purple), SC423 (Tan)) than on resistant lines (i.e., TAM 2567, IS 809). Aphids probing the resistant lines of sorghum showed a significantly reduced imbibition of phloem sap compared with those aphids which fed on susceptible varieties. Also, increased numbers of separate probes and increased duration of non-probing were associated with S. graminum feeding on resistant lines. S. graminum monitored on the non-host plant, rice, exhibited non-phloem ingestion, but not phloem ingestion. Resistance in sorghum to S. graminum is associated with the phloem. There appeared to be no physical differences between the sorghum varieties in the location of or extent of lignification around the vascular bundles. Hence, resistance probably involves plant natural products associated with the phloem sap

Item Type: Article
Author Affiliation: SEA, USDA, Western Regional Research Center, Albany, California 94710, USA
Subjects: Plant Protection > Pests
Crop Improvement > Genetics/Genomics
Crop Improvement > Plant Breeding
Divisions: Sorghum
Depositing User: Mr B Krishnamurthy
Date Deposited: 23 Apr 2012 13:46
Last Modified: 23 Apr 2012 13:46
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