Water Regime

Photosynthetic WUE (µmol/m mol)

Net

Photosynthesis (µmol m² s⁻¹)

Stomatal

Conductance

(mmol m² s⁻¹)

Transpiration

(mmol m² s⁻¹)

Internal

Carbon (ppm)

Vapour Pressure Deficit (bars)

Cultivars (n = 8)

Agria

7.3^a

21.8

620.9

3.2

307.0

7.5

Moonlight

6.5^c

19.1

663.8

3.2

307.8

6.8

Moe Moe

7.2^a

21.6

660.5

3.3

317.7

6.2

Tutaekuri

6.8^b

19.4

658.3

3.1

299.7

6.2

Significant

p < 0.001

p < 0.0001

Ns

Ns

Ns

Ns

Water regime (n = 16)

Irrigation

7.9^a

20.5^a

687.5

3.2

294.2

6.56

Rain-fed

5.9^b

14.4^b

616.2

3.1

321.9

6.79

Significant

p < 0.0001

p < 0.0001

Ns

Ns

0.0001

Ns

Days after emergence (n = 32)

21

4.6^c

15.2^c

637.4^b

3.5^a

350.2^a

7.4^ba

48

9.8^a

24.8^a

753.4^a

2.6^b

286.4^b

4.3^c

64

6.8^b

21.5^b

584.4^b

3.3^a

298.2^b

8.1^a

90

6.4^b

20.4^b

632.1^b

3.3^a

297.4^a

6.9^b

Significant

p < 0.0001

p < 0.001

p < 0.01

p < 0.01

p < 0.05

p < 0.0001