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Table 2 NLB resistance of the subset of 15 TBBC3 introgression lines.

From: Resistance loci affecting distinct stages of fungal pathogenesis: use of introgression lines for QTL mapping and characterization in the maize - Setosphaeria turcicapathosystem

Maize line

Introgressed region (Bin)a

Days to anthesis

Trait (juvenile plants being inoculated; NY and NC)b

Trait (adult plants being inoculated; NY)

   

Relative

IP

Relative

LE

Relative

AUDPC

Relative

IP

Relatvie

AvgDLA

Tx303

 

8.7***

2.1***

-0.3

-164.1***

7.5***

-8.7***

TBBC3-38

1.03, 1.06, 5.00, 5.03, 5.07-5.09

4.0***

2.1***

-0.1

-110.2***

2.6***

-4.5***

TBBC3-39

1.03, 1.06, 5.00, 5.07

2.4***

0.9*

0.0

-67.2**

1.3*

-4.3***

TBBC3-18

1.11, 7.05, 7.06, 10.03, 10.04

4.2***

0.8*

-0.1

-35.8

1.3*

-2.0**

TBBC3-19c

7.04, 7.06, 9.03, 10.04

1.4*

1.2**

0.1

-29.0

1.2

3.2***

TBBC3-26

7.06

1.0

1.4**

0.0

-1.8

-0.1

1.0

TBBC3-75d

6.04-6.05

1.2

0.4

0.1

12.2

2.6***

-2.3**

TBBC3-02

1.07-1.08, 5.01-5.02, 8.03-8.05

3.2***

-0.7

0.2

35.7

0.6

1.5*

TBBC3-14c

1.09-1.10, 4.07

3.1***

-0.9*

0.0

67.0**

0.3

6.7***

TBBC3-03

1.01, 1.04, 7.03, 8.03-8.05

2.8***

-0.1

-0.1

117.0***

-1.4*

5.7***

TBBC3-61c

1.10

1.4*

-0.5

0.6***

126.7***

0.2

7.0***

TBBC3-77

1.01-1.03, 6.04-6.05

4.3***

-1.4**

0.9***

139.4***

-1.4*

4.0***

TBBC3-30

4.02-4.03, 5.04

0.2

-0.9*

0.6***

195.4***

-0.6

4.7***

TBBC3-21

4,07, 9.01-9.04

0.6

-1.7***

0.8***

275.5***

-1.1

7.8***

TBBC3-36

1.01, 1.03-1.05, 4.01, 8.08

1.3

-0.8

0.7***

305.6***

-1.8**

8.2***

TBBC3-42

1.01-1.02, 4.07-4.08, 5.01-5.02, 8.02-8.05

2.2**

-2.1***

0.7**

310.8***

-1.3*

8.7***

  1. In 2007, the same set of plant materials was inoculated at the five- to six-leaf stage in New York (NY) and North Carolina (NC), and were grown in a separate field plot in NY and inoculated 1-2 weeks before anthesis. Trait values shown are the least squares means of maize lines relative to the recurrent parent B73. Phenotypes that were significantly more resistant than B73 are highlighted in bold, while the phenotypes significantly more susceptible than B73 are underscored. The significance level was determined by pair-wise two-tailed Student's t test on the least square difference (denoted as * 0.01 <P < 0.05; ** 0.001 <P < 0.01; *** P < 0.001). Maize lines in bold are the ones that were consistently more resistant or more susceptible than B73 across two field environments.
  2. a Introgressed genome regions from Tx303 (heterozygous regions not shown). Bin position was based on genetic map of intermated B73 × Mo17 population (version IBM 2008 neighbors).
  3. b Relative least squares means of incubation period (IP) and area under the disease progress curve (AUDPC) shown were from the combined analysis across the trials in NY and NC. Lesion expansion (LE) was only scored in NY.
  4. c Individual TBBC3 lines in each field environment were inspected. TBBC3-19 was significantly more resistant than B73 for IP (P = 0.03), DLA1 (P = 0.001), DLA2 (P = 0.035) and AUDPC (P = 0.010) only in NC. TBBC3-14 and TBBC3-61 showed greater susceptibility than B73 for three DLA ratings (P < 0.003) and AUDPC (P < 0.0001) only in NY. The same differential degrees of resistance or susceptibility in two field environments were also observed in 2006 (Additional file 1).
  5. d Resistance to NLB was more effective in adult plants.
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BMC Plant Biology

ISSN: 1471-2229

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