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Table 1 Comparison of leaf and photosynthetic parameters for three common sclerophyll species in Central Chile

From: Mesophyll conductance constrains photosynthesis in three common sclerophyllous species in Central Chile

Variable

Units

Schlerophyll species

ANOVA statistics

L. caustica

C. alba

Q. saponaria

A sat

(μmol m−2 s−1)

7.8 ± 0.7 a

9.5 ± 0.4 a

14.2 ± 0.8 b

***

α

(mol mol−1)

0.019 ± 0.002

0.024 ± 0.002

0.023 ± 0.002

ns

R dark

(μmol m−2 s−1)

0.7 ± 0.1

1.0 ± 0.2

0.6 ± 0.1

ns

Q sat

(μmol m−2 s−1)

987 ± 65 a

964 ± 56 a

1168 ± 57b

*

Q comp

(μmol m−2 s−1)

36 ± 8

51 ± 9

27 ± 4

ns

E

(μmol H2O m−2 s−1)

2133 ± 447

2913 ± 476

3492 ± 654

ns

1 / WUE

(mol H20 mol−1CO2 )

376 ± 93

347 ± 57

285 ± 60

ns

SLA

(m2 kg−1)

7 ± 0.4 a

10 ± 0.7 b

8.7 ± 0.5 ab

***

N a

(mmol m−2)

120.2 ± 8.9 a

195.5 ± 21 b

165.8 ± 17.6 ab

**

E n

(μmol mol−1 s−1)

69.8 ± 9.1 ab

56.4 ± 6.2 a

95.9 ± 8.8 b

**

A max

(μmol mol−1 s−1)

12.03 ± 0.86 a

17.01 ± 0.81 b

23.81 ± 1.18 c

***

dA/dCi

(mol mol−1)

0.038 ± 0.003 a

0.047 ± 0.002 a

0.070 ± 0.004 b

***

g m

(mol m−2 s−1 bar−1)

0.06 ± 0.005 a

0.065 ± 0.004 a

0.097 ± 0.007 b

***

g s

(mol m−2 s−1)

0.221 ± 0.03

0.221 ± 0.025

0.25 ± 0.018

ns

g m / g s

-

0.54 ± 0.18

0.47 ± 0.14

0.43 ± 0.06

ns

L s

-

0.07 ± 0.01

0.07 ± 0.02

0.08 ± 0.01

ns

L m

-

0.35 ± 0.03

0.42 ± 0.02

0.43 ± 0.02

ns

C a

(μmol mol−1)

368.3 ± 0.6

368.7 ± 1

368.7 ± 0.6

ns

C i

(μmol mol−1)

337.7 ± 7

336.5 ± 6.9

333.6 ± 3.7

ns

C c

(μmol mol−1)

220 ± 10.3

202.2 ± 8.2

192.8 ± 5.9

ns

Vcmax (Ci)

(μmol m−2 s−1)

26.8 ± 2.1 a

32.6 ± 1.1 a

49 ± 2.6 b

***

Jmax (Ci)

(μmol m−2 s−1)

56.3 ± 4.1 a

79.6 ± 3.8 a

111.4 ± 5.6 b

***

Jmax/ Vcmax (Ci)

-

2.15 ± 0.1

2.44 ± 0.07

2.29 ± 0.07

ns

Vcmax (Cc)

(μmol m−2 s−1)

45.5 ± 5.1 a

64.4 ± 3.8 a

98.3 ± 5.7 b

***

Jmax (Cc)

(μmol m−2 s−1)

60.4 ± 4.4 a

89.9 ± 4.2 b

126.4 ± 6.1 c

***

Jmax/ Vcmax (Cc)

-

1.41 ± 0.07

1.43 ± 0.06

1.31 ± 0.05

ns

R d *

(μmol m−2 s−1)

1.0 ± 0.1 a

1.7 ± 0.2 b

1.5 ± 0.1 b

***

Ci*

(μmol mol−1)

33 ± 4.2 ab

23.2 ± 2.3 a

34 ± 2.4 b

*

Γ*

(μmol mol−1)

55.5 ± 5.4

56.8 ± 4.1

59.2 ± 5.9

ns

  1. Values are presented as means (± 1 SE, n=15) for the light-saturated rate of photosynthesis (Asat), apparent maximum quantum efficiency (α), the rate of mitochondrial respiration at zero irradiance (Rdark), light saturation (Qsat) and compensation point (Qcomp), evapotranspiration (E), the inverse of water use efficiency (1/WUE), specific leaf area (SLA), the nitrogen content on area basis (Na), photosynthetic nitrogen-use efficiency (EN), Ci-saturated rate of photosynthesis (Amax) and inicial slope of the A/Ci curve (dA/dCi), mesophyll (gm) and stomatal (gs) conductance to CO2 diffusion, and their ratio (gm/gs), relative stomatal, Ls, and mesophyll, Lm, limitations to photosynthesis, the external (Ca), intercellular (Ci) and chloroplastic (Cc) CO2 concentration, maximal rate of Rubisco carboxylation (Vcmax), maximal rate of electron transport driving regeneration of RuBP (Jmax), the ratio Jmax / Vcmax on Ci and Cc basis, the rate of mitochondrial respiration in the light (Rd*), the intercellular (Ci*), and chloroplastic (Γ*) CO2 compensation concentration in the absence of mitochondrial respiration. Separation of means was determined by a Tukey test where applicable. Different letters between species indicate that means were significantly different at P<0.05. Significance of species on photosynthetic parameters are shown as: ns, non significant; *, significant at P<0.05; **, significant at P<0.01; ***, significant at P<0.001.