Evaluation of Mechanisms of Barley Genotypes Tolerance and Antixenosis Schizaphis graminum (Rondani)

Document Type : Research Paper

Authors

1 MSc. Student, College Agriculture, University of Orumieh, Iran

2 Assistant Professor, College Agriculture, University of Orumieh, Iran

3 Assistant Professor, Research Center for Agriculture andNatural Resources,Orumieh, Iran

Abstract

Schizaphis graminum (Rondani) (Hem.: Aphididae) is one of the seriously injurious pests
of cereals particularly of barley. The population of the pest has beenon the increase in recent
years. Besides chemical control, another practically suitable method of controlling the pest is
the use of resistant barley genotypes. In this research, 47 advanced lines along with 13 cultivars
were screened in their seedling stagesin greenhouse conditions (25±2ºC, 55±10% relative
humidity and 16:8 photophase) while testing basis two mechanisms of antixenosis and
tolerance on them. Screening was made on the basis of mean number of aphids (14 days after
infection with the aphid). Rhaihan, Nosrat cultivars as well as line20 (Mall-4-3094-
2//Alpha/Cum/3/Victoria/…ICB01-1368-0AP),carrying the least, whileline13
(Legia/CWB117-5-9-5), line44 (Sls/Bda//Sararood-1) and Zarjo cultivar attracting the most
mean number of aphids, were selected for antixenosis and for tolerance tests. Antixenosis
experiment was carried out as based upon the number of attracted aphids to different cultivars
within 24, 48, and 72 hours following insect release. Results indicated that Zarjo and Raihan
cultivars bore the weakest vs the strongest antixenosis, respectively, as observed within all the
three experimental times. Tolerance experiment was judged by the effect of aphid feeding on
host plant height wise. Raihan cultivar had the most increase in its secondary height (compared
with control) and the least percentage of decrease in its main height (%2.09). Conversely, Zarjo
cultivar exhibited the least increase in its secondary height (compared with control) and the
greatest percentage of decrease in its main height (%65.96), suggesting a least level of
tolerance.

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History

  • Receive Date: 12 December 2011
  • Revise Date: 28 May 2014
  • Accept Date: 24 September 2013

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