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Correlation of bacterial leaf blight symptoms with presence of Sr2

Correlation of bacterial leaf blight symptoms with presence of Sr2. Bob Bowden Seifollah P. Kiani Eduard Akhunov. Yr Mist Chamber Conditions. 10-15°C, 100% relative humidity for 14-16 hours. Symptoms From Yr Mist Chamber. Bacterial Leaf Blight caused by Pseudomonas syringae pv . syringae.

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Correlation of bacterial leaf blight symptoms with presence of Sr2

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  1. Correlation of bacterial leaf blight symptoms with presence of Sr2 Bob Bowden Seifollah P. Kiani Eduard Akhunov

  2. Yr Mist Chamber Conditions 10-15°C, 100% relative humidity for 14-16 hours

  3. Symptoms From Yr Mist Chamber

  4. Bacterial Leaf Blight caused by Pseudomonas syringae pv. syringae Photo by Bill Willis, KSU

  5. Crosses for BLB Mapping • Jagger/Thunder CL, n=295, F5 RILs • KS84HW196/Jagger, n=190, F5 RILs

  6. PBC and SM Ratings 0 = no melanism 1 = low; few tillers have mild symptoms 2 = moderate; many tillers have mild to moderate symptoms 3 = strong; most tillers have moderate to strong symptoms

  7. Association Mapping of PBC and SM

  8. Correlation Coefficients * p<0.01 ** p<0.001 *** p<0.0001 N=221 or 222

  9. Lines with PBC, SM, and BLB csSr2 (-) csSr2 (+) • Arlin • Bennett • C004393 • Erhardt • KS84HW196 • Snowmass • Thunder CL • Wendy • 2174 • Avalanche • BondCL • Centerfield • OK05303 • OK04507 • OK04415 • OK04111 • OK06318 • HV9W03-1551WP • HV9W03-1596R • MTS0713 • Sturdy2K • TAM302

  10. SM, PBC, and BLBon 2174

  11. Inoculations for S. nodorum

  12. Summary • Certain varieties develop symptoms similar to BLB when placed in a dew chamber overnight. • Inoculation with P. syringae is not required. • BLB-like symptom scores correlate with PBC and SM scores as well as Sr2 markers • Some Oklahoma varieties like 2174 seem to express low to moderate BLB, PBC, and SM, but do not carry the diagnostic allele for csSr2 marker (Mago et al, 2010) • A gene conferring susceptibility to BLB-like lesions appears to be linked to Sr2 on chromosome arm 3BS.

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