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QTL Mapping of Partial Resistance to Field Epidemics of Ascochyta Blight of Pea

^a New Zealand Institute for Crop & Food Research Ltd, P.O. Box 4704, Christchurch, New Zealand
^b New Zealand Plant Breeding Ltd, P.O. Box 19, Lincoln, New Zealand
^c Dep. of Agriculture Western Australia, 3 Baron-Hay Court, South Perth, Western Australia, Australia
^d Ministry for Research, Science and Technology, Wellington, New Zealand

View larger version (143K): [in a new window]   Fig. 1. Characterization of M. pinodes, A. pinodes, and P. medicaginis var. pinodella isolates by microscopic examination of perithecia and spores and by RAPD banding patterns. Figure 1A, perithecia observed in M. pinodes isolate WA31; Fig 1B, bicellular conidia observed in A. pinodes isolate WA4; Fig. 1C, small unicellular conidia observed in P. medicaginis var. pinodella isolate WA49; and Fig 1D, RAPD banding patterns produced using primers OPW04 and OPW18. Lanes designated M contain 1-kb DNA ladder markers (Life Technologies).

View larger version (26K): [in a new window]   Fig. 2. Linkage map of the A88 x Rovar population. Anchor loci used to relate these linkage groups to the consensus map of the pea genome are underlined. Codominant markers are italicized. The scale represents centimorgans, calculated in Haldane units.

View larger version (51K): [in a new window]   Fig. 3. Distributions of Ascochyta blight resistance and reproductive stage scores for the 133 F2-derived families from the cross A88 x Rovar in three environments and on two scoring dates. Black bars represent the first scoring date while grey bars represent the second scoring date. The means of the two parents A88 (A) and Rovar (R) for the first (A1 or R1) and second (A2 or R2) scoring dates are shown.

View larger version (24K): [in a new window]   Fig. 4. QTLs for Ascochyta blight resistance and plant reproductive stage detected by composite interval mapping. LOD plots presented were obtained from means of trait scores across environments and from scores from single environments. Plots show QTLs detected for Ascochyta blight field resistance scored on stems (black line), leaves (dark grey line) and pods (light grey line) and reproductive stage (light grey line on linkage group II only). Linkage groups and QTL designations are indicated.