Response of Herbicide-Resistant Palmer Amaranth (Amaranthus palmeri) Accessions to Drought Stress
Table 1
Height and dry weight of Palmer amaranth controlsa.
Accession
County
Resistance
Height (cm)
At harvest
Days of drought stress
Height
Dry weight
0
3
5
7
9
(cm)
(g plant−1)
Individual Palmer amaranth accessionsb
1
Martin
ALSS/GS
7.0
11.0
14.0
19.0
28.0
64.0
5.0
2
Harnett
ALSS/GS
6.4
12.3
16.0
22.0
32.0
68.0
5.0
3
Lenoir
ALSS/GS
7.0
11.3
14.0
18.0
25.0
57.0
4.3
4
Martin
ALSS/GS
7.0
11.3
15.0
19.3
28.0
62.4
4.1
5
Edgecombe
ALSS/GS
8.3
14.0
19.0
24.4
35.0
68.0
4.6
6
Wayne
GR
8.0
13.0
17.0
21.4
30.0
62.4
4.1
7
Hoke
GR
8.3
14.4
18.3
23.3
31.0
63.3
4.5
8
Robeson
GR
8.0
13.3
18.0
24.1
33.4
64.1
4.6
9
Cumberland
GR
8.0
13.4
17.3
23.0
31.0
57.4
4.0
10
Scotland
GR
8.3
16.1
21.4
27.0
33.0
60.6
4.0
11
Robeson
ALSR
8.1
14.0
19.0
25.1
33.3
64.1
4.0
12
Johnston
ALSR
7.0
12.7
17.0
23.0
32.3
68.0
4.1
13
Robeson
ALSR
9.4
16.2
20.2
25.0
31.4
58.3
4.0
14
Sampson
ALSR
9.0
14.0
17.4
23.0
31.0
60.3
3.4
15
Edgecombe
ALSR
8.2
13.4
17.0
22.0
26.2
53.0
3.4
Palmer amaranth accessions grouped by response to herbicidec
1
ALSS/GS
7.0
12.0
15.3
21.0
29.4
63.1
4.5
2
GR
8.0
14.0
18.3
24.0
31.4
62.0
4.2
3
ALSR
8.2
14.0
18.0
23.3
31.0
61.0
3.7
aData are pooled over experiments.
bConsists of fifteen Palmer amaranth accessions.
cConsists of a group of 5 acetolactate synthase-inhibitor susceptible and glyphosate-susceptible (ALSS/GS), a group of 5 acetolactate synthase inhibitor-resistant (ALSR), and a group of 5 glyphosate-resistant (GR) Palmer amaranth accessions.
