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

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

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Table 1. Single locus goodness-of-fit-test for the db gene for resistance to gummy stem blight in watermelon. z<br />

Generation Total Susceptible y Resistant x Expected w χ 2 df P-value<br />

PI 189225 × 'NH Midget'<br />

Field test<br />

P aS 1 v 18 3 15<br />

P bS 1 u 12 12 0<br />

F 1 25 25 0<br />

F 2 110 74 36 3:1 3.50 1 0.06<br />

BC 1P a 46 32 14 1:1 7.04 1 0.01<br />

BC 1P b 56 44 12 1:0 2.57 1 0.10<br />

Greenhouse test<br />

P aS 1 v 40 0 40<br />

P bS 1 u 40 40 0<br />

F 1 60 60 0<br />

F 2 360 242 118 3:1 11.61 1 0.00<br />

BC 1P a 140 98 42 1:1 22.40 1 0.00<br />

BC 1P b 140 136 4 1:0 0.11 1 0.73<br />

116

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