New Zealand Journal of Agricultural Research abstracts

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Identification of resistance to bluegreen aphid and spotted alfalfa aphid in Trigonella species

Ramakrishnan M. Nair

Steve S. Robinson

Kathryn A. Haskard

Kate Dowling

South Australian Research & Development Institute (SARDI)
GPO Box 397
Adelaide, SA 5001
Australia

John P. Klingler^*

CSIRO Entomology and CSIRO Plant Industry
Private Bag 5
Wembley, WA 6913
Australia

^*Author for correspondence: klingler01@gmail.com

Abstract   The genus Trigonella (Fabaceae, tribe Trifolieae) includes potential new species for pasture legume production in phase farming systems of southern Australia. Performance under biotic stress is an important factor in selecting the most suitable species and genotypes for pasture legume breeding programs. Fifty-nine accessions representing 26 Trigonella species and two Medicago species (formerly with Trigonella) were evaluated for resistance to two aphid species, bluegreen aphid (Acyrthosiphon kondoi Shinji), and spotted alfalfa aphid (Therioaphis trifolii (Monell) fm. maculata) in glasshouse experiments. An accession of Trigonella macrorrhyncha (SA 32223) was found to be highly resistant to both the aphids. Accessions of T. coerulescens, T. cylindracea, T. gladiata, T. mesopotamica, T. schlumbergeri and Medicago monspeliaca were found to be resistant to bluegreen aphid, but susceptible to spotted alfalfa aphid. The resistance mechanism in T. macrorrhyncha involved both antixenosis (non-preference in a choice test) and antibiosis (reduced fecundity). The implications of these results for germplasm improvement are discussed.

Keywords   Acyrthosiphon kondoi Shinji; antibiosis; antixenosis; bluegreen aphid; pasture legume; resistance; spotted alfalfa aphid; Therioaphis trifolii (Monell) fm. maculata; Trigonella

A06072; Online publication date 3 July 2007; Received 30 November 2006; accepted 9 March 2007

New Zealand Journal of Agricultural Research, 2007, Vol. 50: 299–306
0028–8233/07/5003–0299 © The Royal Society of New Zealand 2007

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