Table 4 Mean values of plant dry weight, grain yield and its agronomic components, dry matter partitioning, apparent water use, plant water-use efficiency (WUE) and carbon isotope discrimination in kernels (Δ13C), of 14 genotypes growing in a glasshouse under well-watered (WW) and water-limited (WL) conditions (Experiment 1). G – genotype; W – water regime.

From: Genotypic variations in leaf and whole-plant water use efficiencies are closely related in bread wheat genotypes under well-watered and water-limited conditions during grain filling

Trait

Water condition

ANOVA

WW

WL

G

W

GxW

Plant dry weight (g)

35.3

26.5

***

***

n.s.

Grain yield (GY; g plant−1)

17.0

13.0

***

***

n.s.

Spikes per plant

6.4

5.0

***

*

n.s.

Kernel per spike

51.7

49.6

**

n.s.

n.s.

Thousand kernel weight (g)

51.8

53.8

***

***

n.s.

Kernel per plant

330.5

248.4

***

***

n.s.

Harvest index

0.52

0.53

***

n.s.

n.s.

Root:shoot

0.10

0.09

*

n.s.

n.s.

Plant water use (WU; L plant−1)

7.3

4.9

**

***

n.s.

Plant WUE (g L−1)

4.9

5.5

***

***

n.s.

GY/WU (g L−1)

2.4

2.7

***

***

n.s.

Δ13C in kernel (‰)

20.31

19.02

**

***

n.s.

  1. Significance levels: *(P < 0.05), **(P < 0.01), ***(P < 0.001), n.s. (differences not significant; P > 0.05).
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