1 Proceedings of the 2007 CPM Short Course and MCPR Trade Show December 4 6, 2007 Minneapolis Convention Center Do not Reproduce or Redistribute Without Written Consent of the Author(s)
2 The Application and Effectiveness of the Rag1 Gene for Resistance to Soybean Aphid Brian Diers, Univ. of Illinois Matt O Neal, O Iowa State Univ.
3 Outline Background on soybean aphids. Background on resistance. Mapping of aphid resistance genes. Aphid isolate interaction testing. Results from evaluations of experimental lines with the aphid resistance gene Rag1. Future and ongoing research.
4 Take Home Message Varieties with the aphid resistance gene Rag1 (and other genes) will be available in the near future. The Rag1 resistance gene is not the complete answer, aphids can defeat this gene. Will still need to scout fields planted to aphid resistant varieties.
5 Soybean Aphid Resistance Soybean aphids (Aphis glycines Matsumura) were first identified as a soybean pest in North America in Native to Asia. Spread throughout the northern US soybean production region and southern Canada.
6 Soybean Aphid Management Insecticides Biological Control Host Plant Resistance
7 Insecticides are the Main Management Option for Growers Growers are recommended to treat aphid populations with a foliar insecticide when they exceed 250 aphids per plant. Insecticide use targeting aphids in Iowa 2003 ~ 4 million acres ( ~ ,000 acre ( ~2 million acres spider mite outbreaks in eastern Iowa ~500,000 acres (low estimate) ~50% of Iowan soybeans treated at least once.
8 Host Plant Resistance Antixenosis The inability for an insect pest to find and feed on the plant. Antibiosis The inability for the pest to grow and reproduce while feeding on a resistant plant. Tolerance The ability of the plant to yield despite insect feeding.
9 Screening for Resistance to the Soybean Aphid Germplasm Commercial cultivars (MG II, II, IV) Asian cultivars Number tested Number resistant 0 0 Pubescent lines Ancestral lines Diverse collection of germplasm accessions > Hill, C.B., Y. Li, and G. L. Hartman Resistance to the soybean aphid in soybean germplasm. Crop Science 44:
10 Antibiosis Resistance in Dowling, Jackson and PI Aphid Mortality Adults Nymphs Survival rate (% Jackson Dowling PI Pana Days Survival rate (%) Days Jackson Dowling PI Pana Li, Y., C.B. Hill, and G.L. Hartman Effect of three resistant soybean genotypes on the fecundity, mortality, and maturation of soybean aphid (Homoptera : Aphididae). Journal of Economic Entomology 97:
11 Antibiosis Resistance in Dowling, Jackson and PI Aphid fecundity Progeny/female/10 days L1 L2 L3 Leaf number Dowling Jackson PI Pana
12 Mapping Aphid Resistance The maturities of Dowling (MG VIII), Jackson (MG VII) and PI (MG VIII) make them incompatible for production in the Midwest. The resistance gene(s) need to be bred into northern soybean backgrounds. This breeding would be more efficient if the locations of the resistance gene(s) were known.
13 Resistance in Dowling, Jackson and PI Mapped Resistance was mapped in a population of F 2 plants. The populations were evaluated for resistance in a greenhouse tests.
14 Map Location of the Aphid Resistance Gene (Rag1( Rag1) ) on LG M Across Dowling Crosses Jackson x Loda 0.0 Satt Satt540 Satt435 Rag Satt540 Satt435 Rag Satt463 Satt245 Satt323 Satt Satt463 Satt245 Satt220
15 Backcrossing Aphid Resistance In 16 months five backcrossed were made to move the Rag1 gene from Dowling into the background of the MG II variety Loda. Developed BC4F 1 plants in 3 other backgrounds. Backcross F 1 plants Dowling X
16 2005 Field Evaluations Tested the equivalent of BC1F 2 -derived resistant and susceptible lines in Compared approximately 15 resistant to 15 susceptible lines. Small plots in screened cages at U of I and Michigan State University. Inoculated with aphids and protected from predators. Insecticide treated and not treated plots in Illinois.
17 Results from U of I Cage Test There were significantly fewer aphids on resistant plants then susceptible plants. Trait Aphid rating (6-28) Aphid rating (7-22) Plant height (inches) Seed yield (g) Res Susc Aphid rating: 0 = no aphids, 4 = severe plant damage. Difference between resistant and susceptible genotypes significant for all traits (P<0.05). Difference between resistant and susceptible genotypes was significant at P<0.05) for all traits.
18 Aphid Resistant Line Aphid Susceptible Line
19 Aphid Infestations ( ) Resistant Line Susceptible Line
20 Agronomic Evaluations of Resistant and Susceptible BC Lines. Noninfested Yield tests across of BC3F2 lines (Loda) and BC2F2 lines (Dwight). Trait Loda Maturity (date) Plant height (in) Yield (bu/acre) Dwight Maturity (date) Plant height (in) Yield (bu/acre) Res. (32) (19) Susc. (22) (24)
21 Commercial Development of Varieties with Rag1 University of Illinois has developed experimental lines with Rag1 in MG II-IV backgrounds. This germplasm has been licensed to commercial breeding companies. Increases of our varieties is occurring this winter but commercial quantities of seed will not be available until Seed from commercial companies will be available 2009.
22 Aphid Resistance: The Bad News Aphid biotypes exist that can overcome Rag1. Biotype = an insect population that is resistant to the defenses of the host plant. Soybean aphid biotype found resistant to Rag1. Biotype found in Ohio. Unofficial reports of these isolates in other locations.
23 Aphid Isolate x Soybean Genotype Interaction Test Tested aphid resistance sources and aphid susceptible genotypes with a soybean aphid isolate from Illinois (obtained from Glen Hartman) and from Ohio (obtained from Rouf Mian). Conducted two non-choice tests that were each replicated three times. Each replicate was a single caged plant.
25 Aphid Isolate x Soybean Genotype Interaction Test Dwight Aphid Isolate Illinois Ohio ---No. of Aphids Plant bc 398c Williams 82 Dowling (Rag1) LD (Rag1) Jackson (Rag) PI (Rag2) PI C (MSU) 726a 15d 29d 11d 10d 21d 574abc 639ab 627ab 414c 7d 7d
26 How Common are the Ohio Type Aphid Biotypes in Fields? We don t really know. This Ohio biotype is are of the diversity present in the U.S, not selected. Evidence can be gleaned from experiments conducted by a project funded by the NCSRP. David Ragsdale (U of M) and Matt O Neal (ISU) lead this program. Aphid resistant lines are being tested in different Midwest field locations.
27 Host plant resistance Iowa (Matt O Neal) O Resistant (Rag1) and susceptible isolines artificially infested with 10 aphids per plant and caged Average aphids per plant (+SEM) Aphid resistant soybeans Aphid susceptible soybean 13-Jul 17-Jul 20-Jul 25-Jul 31-Jul The resistant soybean contains the Rag1 gene. The susceptible soybean is an isoline that does not contain the Rag1 gene. Resistant soybeans slowed aphid reproduction.
28 Host Plant Resistance (Matt O Neal) O Plots of each variety were kept aphid free (yellow) or left untreated (blue). Susceptible soybean Resistant (Rag1) soybean
29 Host Plant Resistance Soybean aphid resistance tested on naturally occurring populations. Resistant soybeans were not aphid free, reaching threshold by 31 July 2007.
30 Host Plant Resistance Iowa Soybean aphid resistance tested on naturally occurring populations. Average aphids per plant (+SEM) Aphid resistant soybean Aphid susceptible soybean 3- Jul 10- Jul 17- Jul 24- Jul 31- Jul 7- Aug 14- Aug Resistant soybeans were not aphid free, reaching threshold by 31 July 2007.
31 Host Plant Resistance Iowa Yield reductions occurred due to aphids. Average bu/acre (+SEM) untreated aphid-free untreated aphid-free Soybean aphid resistant Soybean aphid susceptible
32 Host Plant Resistance Minnesota (David Ragsdale) Yield reductions did not occur due to aphids. Average bu/acre (+SEM) Aphid free Resistant Untreated control Susceptible Peak aphid populations: Susceptible ~ 500, Resistant ~ 100 aphids per plant
33 Host Plant Resistance Illinois (Kevin Steffey) Yield reductions did not occur due to aphids. Average bu/acre (+SEM) untreated aphid-free untreated aphid-free Soybean aphid resistant Soybean aphid susceptible Peak aphid populations: Susceptible = 478, Resistant = 224 aphids per plant
35 Test of U of I Developed Line with Rag1 by Channel Bio Owatonna, MN Prepared bytodd Vagts Technical Support Agronomist Aphid Resistant Aphid Susceptible Channel Bio is a registered trademark of Channel Bio Corp. BioFuture SM is a service mark of Channel Bio Corp.
36 Host Plant Resistance - Wisconsin Wisconsin (est. Aphids per Plant) commercial variety #1 Resistant Susceptib KS5004N LD LD SDX04R SD01-76R E06901 E06902 E06905 E06906 K1639 LD LD LD SDX04R SDX04R Avg. Aphids per Plant Average number of aphids/plant on August 9, 2007
37 New Aphid Resistance Genes are Being Used Soybean varieties are being developed with aphid resistance from a number of germplasm sources. Dechun Wang at Michigan State University developed lines show good resistance in the field. They are further from commercializing these lines than Rag1 germplasm.
38 Other Sources of Resistance - Iowa Iowa Resistant Susceptible commerical variety # 3 commerical variety #2 commerical variety #1 KS1639 LD LD LD SDX04R E06901 E06902 E06905 E06906 KS5004N LD LD SD01-76R SDX04R SDX04R Average cumulative aphid days (+SEM)
39 Other Sources of Resistance - Wisconsin Wisconsin (est. Aphids per Plant) commercial variety #1 Resistant Susceptib KS5004N LD LD SDX04R SD01-76R E06901 E06902 E06905 E06906 K1639 LD LD LD SDX04R SDX04R Avg. Aphids per Plant Average number of aphids/plant on August 9, 2007
40 New Aphid Resistance Genes are Being Used Rag2 from PI shows a high level of resistance of our isolate that overcomes Rag1. Will have field tests of Rag2 lines this summer. Stacking Rag1 and Rag2. Glen Hartman (U of I) recently identified 40 accessions from Asia that show a high level of aphid resistance. Starting to study the genetics of resistance from these sources.
41 Conclusions Resistance to soybean aphids exists. Aphid resistant varieties with Rag1 are the closest to commercialization. There are aphid biotypes that can overcome this resistance gene. Varieties with aphid resistance genes other than Rag1 will be available during the next few years. Will need to scout fields of aphid resistant varieties!
42 Contributors Glen Hartman Matt O Neal Curt Hill Ki-Seung Kim Yan Li David Ragsdale
43 Acknowledgements We are grateful for funding from the following:
44 Marker Assisted Selection Polyacrylamide gels ABI 377 sequencer Light Cycler SNP detector
45 Results from Michigan Cage Test, and Wisconsin and South Dakota Field Test Test Michigan Cage (0-5 scale) Wisconsin Field (% plants colonized) South Dakota Field (No. of aphids) Res % 184 Susc % 593 Michigan rating: 0 = no aphids, 4 = severe plant damage.
46 Soybean aphid-susceptible vs. -resistant soybean varieties Whiteside County, University of Illinois 52 * * SD01-76R+ LD LD LD LD LD LD LD LD LD LD SD01-76R Mean yield (bushels per A)
47 Host Plant Resistance - Illinois (Kevin Steffey) ) 1 August LD LD LD LD LD LD LD LD LD LD SD01-76R+ SD01-76R Mean no. aphids per plant
48 LD Host Plant Resistance - Illinois (Kevin Steffey) ) 8 August 2007 LD LD LD LD LD LD LD LD LD SD01-76R SD01-76R+ Mean no. aphids per plant
49 Host Plant Resistance - Illinois (Kevin Steffey) ) 1 August LD LD LD LD LD LD LD LD LD LD SD01-76R+ SD01-76R Mean no. aphids per plant
50 Host Plant Resistance - Illinois (Kevin Steffey) ) 15 August SD01-76R+ LD LD LD LD LD LD LD LD LD LD SD01-76R Mean no. aphids per plant
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