New Zealand Journal of Agricultural Research abstracts
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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