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ARS Home » Plains Area » Brookings, South Dakota » Integrated Cropping Systems Research » Research » Publications at this Location » Publication #171729
Title: ANTIBIOSIS AND ANTIXENOSIS TO RHOPALOSIPHUM PADI AMONG TRITICALE ACCESSIONS

Author
item Hesler, Louis
item THARP, CECIL - MONTANA STATE UNIV

Submitted to: Euphytica
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 2/26/2005
Publication Date: 8/1/2005
Citation: Hesler, L.S., Tharp, C.I. 2005. Antibiosis and antixenosis to rhopalosiphum padi among triticale accessions. Euphytica. 143(1):153-160.

Interpretive Summary: Tests for resistance to the bird cherry-oat aphid were conducted among four wheat and eight triticale lines. Tests included measuring aphid-population growth over 13 days, the number of days to reproduction of individual aphids, and the number of aphid offspring produced in the first 7 days of adulthood. Non-preference for the wheat and triticale was measured in no-choice nymphiposition tests and in choice tests using winged aphids. Three of seven triticale lines limited aphid populations compared to Arapahoe wheat. Lower aphid-population growth on lines N1185 and Okto Derzhavina could be explained partially by increased developmental times of aphids. Lower population growth on triticale lines N1185, N1186 and Okto Derzhavina could be explained at least partially by fewer aphid offspring on these lines. Developmental time of aphids on N1185 and Okto Derzhavina was greater than that on the triticale line Stniism 3, which was identified previously as resistant to bird cherry-oat aphids. There were less aphid offspring produced on N1185 than on Stniism 3, and comparable numbers of R. padi progeny among N1186, Okto Derzhavina, and Stniism 3. None of the accessions limited nymph deposition by aphids. Choice tests revealed variableness in host selection by R. padi but an overall trend that triticale lines were less preferred hosts than Arapahoe wheat. Relatively strong levels of resistance in these triticale lines warrant consideration of their future use in breeding programs for cereal-aphid resistance.

Technical Abstract: Tests for antibiosis and antixenosis resistance to Rhopalosiphum padi L., the bird cherry-oat aphid, were conducted among four wheat (Triticum aestivum L.) and eight triticale (XTriticosecale Wittmack) accessions. Tests for antibiosis included measuring R. padi-population growth over 13 d, number of days to reproduction of individual R. padi, and number of aphid progeny produced in the first 7 d of adulthood. Antixenosis was measured in no-choice nymphiposition tests and in choice tests of host selection by winged R. padi. Three of seven triticale accessions limited R. padi populations relative to control accessions. Lower R. padi-population growth on N1185 and Okto Derzhavina could be explained partially by increased developmental times. Lower R. padi-population growth on triticale accessions N1185, N1186 and Okto Derzhavina could be explained at least partially by fewer aphid progeny on these accessions. Developmental time of R. padi on N1185 and Okto Derzhavina was greater than that on Stniism 3 triticale, identified previously as resistant to R. padi. There were less R. padi progeny on N1185 than on Stniism 3, and comparable numbers of R. padi progeny among N1186, Okto Derzhavina, and Stniism 3. None of the accessions limited nymphiposition by R. padi. Choice tests revealed heterogeneity in host selection by R. padi but an overall trend that triticale accessions were less preferred hosts than Arapahoe wheat. Relatively strong levels of resistance in these triticale accessions warrant consideration of their future use in breeding programs for cereal-aphid resistance.