Table 2 Results of generalized linear models fitting foliar elemental contents of five plant species with and without mycorrhiza.

From: High specificity in plant leaf metabolic responses to arbuscular mycorrhiza

Analysis of deviance table

 

Phosphorus content*

Carbon content †

Nitrogen content ‡

Term

Residual

P (χ2)

Residual

F

P (F)

Residual

P (χ2)

 

df

Deviance

  

df

Deviance

  

df

Deviance

  

Null

99

70.16

  

99

732.63

  

99

7.44

  

Biomass (Biom)

    

98

729.91

3.14

0.080

98

4.66

 

<0.001

Species (Sp)

    

94

102.93

181.3

<0.001

94

4.05

 

0.002

Treatment (Tr)

98

62.59

 

<0.001

93

102.70

0.27

0.607

93

3.96

 

0.132

Biomass: Species

    

89

91.22

3.32

0.014

89

3.44

 

0.005

Species: Tr

    

85

73.48

5.13

<0.001

85

3.07

 

0.038

Treatment contrasts

Phosphorus content

Carbon content

Nitrogen content

 

Estimate

s.e.

t

P (t)

Estimate

s.e.

t

P (t)

Estimate

s.e.

t

P (t)

(Intercept)

2.28

0.23

9.90

<0.001

2.6E−02

4.0E−04

63.90

<0.001

1.56

0.14

11.20

<0.001

Biomass

    

−2.2E−03

4.4E−04

−5.09

<0.001

−0.85

0.16

−5.40

<0.001

Species (Pm)

    

−7.0E−04

6.5E−04

−1.07

0.288

−0.69

0.22

−3.16

0.002

Species (Vc)

    

−3.5E−03

4.9E−04

−7.11

<0.001

−0.34

0.18

−1.91

0.059

Species (Mt)

    

2.8E−03

6.7E−04

4.22

<0.001

−0.44

0.20

−2.15

0.034

Species (Pa)

    

−1.6E−03

7.8E−04

−2.11

0.038

−0.78

0.28

−2.80

0.006

Treatment (AM)

−0.97

0.27

−3.65

<0.001

1.9E−03

2.4E−04

0.79

0.433

−0.07

0.09

−0.78

0.441

Biom: Sp (Pm)

    

1.8E−03

6.4E−04

2.85

0.006

0.62

0.22

2.80

0.006

Biom: Sp (Vc)

    

2.0E−03

5.6E−04

3.50

<0.001

0.50

0.21

2.35

0.021

Biom: Sp (Mt)

    

9.5E−04

6.6E−04

1.44

0.153

0.36

0.21

1.74

0.085

Biom: Sp (Pa)

    

1.6E−03

8.2E−04

1.94

0.056

0.86

0.30

2.88

0.005

Sp (Pm): Tr (AM)

    

1.7E−05

3.6E−04

0.05

0.963

0.23

0.12

1.86

0.066

Sp (Vc): Tr (AM)

    

3.6E−04

3.2E−04

1.13

0.261

0.26

0.12

2.10

0.039

Sp (Mt): Tr (AM)

    

−1.3E−03

3.9E−04

−3.33

0.001

0.25

0.12

2.00

0.048

Sp (Pa): Tr (AM)

    

−1.1E−04

3.4E−04

−0.33

0.744

−0.01

0.12

−0.10

0.924

  1. AM, arbuscular mycorrhizal plants; Pm, Plantago major; Vc, Veronica chamaedrys; Mt, Medicago truncatula; Pa, Poa annua.
  2. Factor level combination Plantago lanceolata (Species) and non-mycorrhizal plants (Treatment) as reference group.
  3. *Saturated model: P~Biomass * Species * Treatment; Minimal adequate model: P~Treatment; Error structure: gamma; link function: inverse.
  4. †Saturated model: C~Biomass * Species * Treatment; Minimal adequate model: C~Biomass+Species+Treatment+Biomass: Species+Species: Treatment; Error structure: Gaussian; link function: inverse.
  5. ‡Saturated model: N~Biomass * Species * Treatment.Minimal adequate model: N~Biomass+Species+Treatment+Biomass: Species+Species: Treatment; Error structure: gamma; link function: log.Significant P values (<0.05) are given in bold.
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