Citrullus lanatus (Thunb.) Matsum. & Nakai - Cucurbit Breeding ...
Citrullus lanatus (Thunb.) Matsum. & Nakai - Cucurbit Breeding ... Citrullus lanatus (Thunb.) Matsum. & Nakai - Cucurbit Breeding ...
Table 3. Variance and heritability estimates for the four watermelon families screened for resistance to gummy stem blight in greenhouse and field tests in North Carolina (2002-2003) z . Pedigree σ 2 (P) y σ 2 (E) x σ 2 (G) w σ 2 (A) v H 2 B u h 2 n t Field test PI 189225 × 'NH Midget' 3.37 0.83 2.55 -0.79 0.76 -- s PI 482283 × 'NH Midget' 4.22 0.82 3.40 0.39 0.81 0.09 PI 482283 × 'Calhoun Gray' 5.52 4.37 1.15 0.82 0.21 0.15 PI 526233 × 'Allsweet' 2.12 0.17 1.95 4.09 0.92 1.93 Mean 3.81 1.55 2.26 1.32 0.68 0.54 Greenhouse test PI 189225 × 'NH Midget' 4.20 1.01 3.19 4.07 0.76 0.97 PI 482283 × 'NH Midget' 4.28 1.74 2.54 4.87 0.59 1.14 PI 482283 × 'Calhoun Gray' 4.09 0.73 3.36 5.25 0.82 1.28 PI 526233 × 'Allsweet' 3.16 0.85 2.31 3.60 0.73 1.14 Pooled Mean 3.93 1.08 2.85 4.45 0.73 1.13 PI 189225 × 'NH Midget' r 4.00 0.97 3.03 2.70 0.76 0.67 PI 482283 × 'NH Midget' q 4.31 1.58 2.72 3.36 0.63 0.78 PI 482283 × 'Calhoun Gray' p 5.58 3.47 2.11 5.25 0.38 0.94 PI 526233 × 'Allsweet' o 6.39 1.73 4.65 7.70 0.73 1.21 Mean 5.07 1.94 3.13 4.75 0.63 0.90 z Data are ratings from four families of resistant PI accessions by susceptible cultivars of Citrullus lanatus var. lanatus and citroides. Disease assessment scale adopted for evaluating watermelon for resistance to gummy stem blight: 0 = no disease; 1 = yellowing on leaves (suspect of disease only); 2 to 4 = symptoms 123
on leaves only; 5 = some leaves dead, no symptoms on stem,; 6 to 8 = symptoms on leaves and stems; 9 = plant dead y σ 2 (P) = phenotypic variance = ! 2 x σ 2 (E) = environmental variance = w σ 2 (G) = genetic variance = ! 2 ( ) F 2 ! 2 ( ) + ! 2 ( ) + 2 " ! 2 ( ) P a ( P) " ! 2 ( E) v σ 2 (A) = additive variance = 2 ! " 2 [ ( F ) 2 ] # " 2 u H 2 B = broad-sense heritability t h 2 n = narrow-sense heritability P b 4 [ F1 ] ( BC P ) + " 1 a 2 [ ( BC P ) 1 a ] s Negative estimate from a negative estimate of additive variance r F 2 Bartlett's χ 2 = 1.94; P-value = 0.16 q F 2 Bartlett's χ 2 = 0.01; P-value = 0.92 p F 2 Bartlett's χ 2 = 1.49; P-value = 0.22 o F 2 Bartlett's χ 2 = 2.95; P-value = 0.09 124
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on leaves only; 5 = some leaves dead, no symptoms on stem,; 6 to 8 = symptoms on leaves and stems; 9 =<br />
plant dead<br />
y σ 2 (P) = phenotypic variance = ! 2<br />
x σ 2 (E) = environmental variance =<br />
w σ 2 (G) = genetic variance = ! 2<br />
( )<br />
F 2<br />
! 2<br />
( ) + ! 2 ( ) + 2 " ! 2 ( )<br />
P a<br />
( P)<br />
" ! 2 ( E)<br />
v σ 2 (A) = additive variance = 2 ! " 2 [ ( F ) 2 ] # " 2<br />
u H 2 B = broad-sense heritability<br />
t h 2 n = narrow-sense heritability<br />
P b<br />
4<br />
[ F1 ]<br />
( BC P ) + " 1 a<br />
2<br />
[ ( BC P ) 1 a ]<br />
s Negative estimate from a negative estimate of additive variance<br />
r F 2 Bartlett's χ 2 = 1.94; P-value = 0.16<br />
q F 2 Bartlett's χ 2 = 0.01; P-value = 0.92<br />
p F 2 Bartlett's χ 2 = 1.49; P-value = 0.22<br />
o F 2 Bartlett's χ 2 = 2.95; P-value = 0.09<br />
124
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