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Citrullus lanatus (Thunb.) Matsum. & Nakai - Cucurbit Breeding ...

Citrullus lanatus (Thunb.) Matsum. & Nakai - Cucurbit Breeding ...

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Table 2. Phenotypic variances by generation for the four watermelon families screened for resistance to gummy<br />

stem blight in greenhouse and field tests in North Carolina (2002-2003) z .<br />

Pedigree σ 2 (P a) σ 2 (P b) σ 2 (F 1) σ 2 (F 2) σ 2 (BC 1P a) σ 2 (BC 1P b)<br />

Field test<br />

PI 189225 × 'NH Midget' 0.97 0.08 1.12 3.37 3.18 4.35<br />

PI 482283 × 'NH Midget' 0.46 0.35 1.23 4.22 3.39 4.66<br />

PI 482283 × 'Calhoun Gray' 0.33 0.00 8.57 5.52 10.23 0.00<br />

PI 526233 × 'Allsweet' 0.67 0.00 0.00 2.12 0.05 0.09<br />

Mean 0.61 0.11 2.73 3.81 4.21 2.27<br />

Greenhouse test<br />

PI 189225 × 'NH Midget' 0.95 0.05 1.52 4.20 2.70 1.63<br />

PI 482283 × 'NH Midget' 0.25 0.34 3.19 4.28 2.61 1.08<br />

PI 482283 × 'Calhoun Gray' 0.33 1.00 0.80 4.09 2.05 0.88<br />

PI 526233 × 'Allsweet' 0.33 0.33 1.37 3.16 2.35 0.39<br />

Pooled<br />

Mean 0.46 0.43 1.72 3.93 2.43 0.99<br />

PI 189225 × 'NH Midget' y 1.03 0.06 1.39 4.00 2.80 2.51<br />

PI 482283 × 'NH Midget' x 0.34 0.34 2.83 4.31 2.99 2.27<br />

PI 482283 × 'Calhoun Gray' w 1.47 1.60 5.41 5.58 5.11 0.79<br />

PI 526233 × 'Allsweet' v 1.24 0.30 2.70 6.39 4.48 0.58<br />

Mean 1.02 0.57 3.08 5.07 3.84 1.54<br />

z Data are ratings from four families of resistant PI accessions by susceptible cultivars of <strong>Citrullus</strong> <strong>lanatus</strong><br />

var. <strong>lanatus</strong> and citroides. Disease assessment scale adopted for evaluating watermelon for resistance to<br />

gummy stem blight: 0 = no disease; 1 = yellowing on leaves (suspect of disease only); 2 to 4 = symptoms<br />

121

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