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Table 1 Difference among horticultural types in their phenotypic reaction to V. dahliae race 1 tested in field trials

From: The LsVe1L allele provides a molecular marker for resistance to Verticillium dahliae race 1 in lettuce

Horticultural type or species

No. of tested accessions

No. of accessions with disease incidence

Frequency of resistant accessions

Chi-square test a

0.00 (resistant)

0.01–0.25

0.26–0.50

0.51–0.75

0.76–1.00

Batavia

6

2

 

4

  

0.33

1.6

Butterhead

14

3

9

1

 

1

0.21

0.8

Green leaf

18

2

2

10

2

2

0.11

0.1

Iceberg

46

 

10

23

10

3

0.00

12.8*

Latin

7

6

1

   

0.86

19.0*

Oil

4

    

4

0.00

1.1

Red leaf

15

4

 

3

4

4

0.27

2.0

Romaine

36

2

9

20

4

1

0.06

2.2

Stem

3

1

 

2

  

0.33

0.8

Lactuca serriola

1

   

1

 

0.00

0.3

Total

150

20

31

63

21

15

0.13

 
  1. a Values of two-sided χ2 test for the frequency of resistant accessions. Asterisk (*) indicates horticultural types with the frequency of resistant accessions significantly different at experiment-wise p < 0.01 from the overall frequency (0.13) observed for all tested types. Note that the statistical test has a low to absent detection power for significant results for horticultural types with a very few tested accessions
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BMC Plant Biology

ISSN: 1471-2229

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