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Table 2 Segregation ratio of PWD resistance in ‘Tanabe 54’ x ‘Tosashimizu 63’ F1 population following the rating scale of Table 1

From: Construction of genetic linkage map and identification of a novel major locus for resistance to pine wood nematode in Japanese black pine (Pinus thunbergii)

Progeny

No. of plants/Phenotypic score

Total

Binary standarda

Expected ratio (1:1)*

Expected ratio (3:1)*

S1

S2

S3

S4

Resistant

Susceptible

X2

p-value

X2

p-value

Tanabe 54′ x ‘Tosashimizu 63’

88

6

2

92

188

94

94

0.00

1.00

62.67

0.00

  1. *Chi-squared and p-values (one degree of freedom) are calculated under the assumption of a Mendelian 1:1 and 3:1 segregation ratio
  2. a Resistant and Susceptible are based on S1 + S2 (Resistant) and S2 + S3 (Susceptible)