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number in wheat, but not by the weight of the single barley and wheat grain (Table 1;
Bergmann et al. 1991; Eckert 1988). This firmer position of side tillers in plants treated with
alkanolamines is shown in Figure 3.
140
Main tiller
Side tillers
120
97
94
100
84
80
60
40
16
20
6
3
0
No stress,
no EA
Stress, no
EA
Stress and
EA
Figure 3. Distribution of
14
C assimilate (%) between main and side tiller ears of spring barley plants in
the state of early flowering. The plants subjected to drought stress (soil water reduced from 65 to 35 %
water-holding capacity) were treated with ethanolamine (10 mg per Mitscherlich pot) and exposed to
14
CO
2
for 24 h. Adapted from Bergmann et al. (1991).
160
Dry weight
Total N
140
130.4a
125b
114.8a
113.8b
120
108.1a
106.1
106.2
99.5
100
80
60
40
20
0
Whole plant
Fertile side
tillers
Straw and
grains
Grains in fertile
side tillers
Winter wheat cv. Alcedo
Winter rye cv. Pluto
Figure 4. Influence of ethanolamine application on dry weight production and total-N accumulation of
particular plant organs in drought-stressed wheat and rye cultivars grown in Mitscherlich pots (6.9 kg
soil, NH
4
NO
3
/urea fertilization, 16 plants). Values given in percent refer to those of untreated, drought-
stressed controls (100 %), and deviate significantly at
p
< 0.05 (a) or < 0.1 (b).
No significant effects of EA on dry weight production and total N were detected for ears, main tiller,
and root of wheat, and for tillers and main-tiller grains of rye. Adapted from Bergmann et al. (1991).
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