Table 1 Number of plants produced, selection differential and recurrent parent genome recovery in backcross generations.

From: Marker-aided Incorporation of Xa38, a Novel Bacterial Blight Resistance Gene, in PB1121 and Comparison of its Resistance Spectrum with xa13 + Xa21

Generation

No. of plants

Foreground Selection

Traits

PB1121

Phenotypic Selection for quality traits

Background Selection

No. of plants selected

Range before selection

Range in selected top ten plants

Δd

Progressive Δd

RPG recovery (%)

BC1F1

468

223

KLAC (mm)

18.56

11.26 to 15.65

14.89 to 15.65

0.32

0.32

70.60–79.29

KLBC (mm)

8.65

6.78 to 7.98

7.11 to 7.98

1.56

1.56

Aroma

2

0 to 2

1 to 2

–

 

BC2F1

198

100

KLAC (mm)

18.41

15.00 to 17.20

16.82 to 17.24

0.12

0.44

83.60–88.57

KLBC (mm)

8.65

7.12 to 8.72

8.21 to 8.72

0.36

1.92

Aroma

2

1 to 2

2

–

 

BC2F2

243

65

KLAC (mm)

18.45

17.18 to 18.25

17.95 to 18.25

0.29

0.73

88.57–92.86

KLBC (mm)

8.75

7.83 to 8.79

8.25 to 8.79

0.15

2.07

Aroma

2

2

2

–

 

BC2F3

145

10

KLAC (mm)

18.54

17.25 to 18.82

17.95 to 18.82

0.37

1.10

93.18–94.70

KLBC (mm)

8.68

8.56 to 8.78

8.64 to 8.76

0.02

2.09

Aroma

2

2

2

–

 

BC2F4

25

10

KLAC (mm)

18.66

17.65 to 19.16

18.22 to 19.16

0.45

1.55

93.18–96.92

KLBC (mm)

8.74

8.26–8.74

8.42 to 8.74

0.00

2.09

Aroma

2

2

2

–

 
  1. Δd – Selection differential, the mean deviation of the selected population from the base population.
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