Table 4: Percent reduction in height and dry weight 30 days after emergence and the slopes of regression lines for percentage of reduction in height of 15 Palmer amaranth accessionsa.
Accession
County
Resistanceb
Height
Dry weight
Slope
% reduction plant−1
% reduction day−1
1
Martin
ALSS/GS
11 b–d
27 b
5.5 a
2
Harnett
ALSS/GS
15 a
29 ab
4.5 abc
3
Lenoir
ALSS/GS
12 a–d
21 d
3.2 c
4
Martin
ALSS/GS
10 cd
16 e–g
3.5 c
5
Edgecombe
ALSS/GS
12 a–d
22 cd
3.3 c
6
Wayne
GR
13 a–c
14 fg
4.0 abc
7
Hoke
GR
14 ab
33 a
3.6 bc
8
Robeson
GR
9 d
20 de
3.4 c
9
Cumberland
GR
5 e
12 g
3.2 c
10
Scotland
GR
10 cd
18 d–f
3.3 c
11
Robeson
ALSR
13 a–c
22 cd
4.7 abc
12
Johnston
ALSR
13 a–c
16 e–g
5.1 ab
13
Robeson
ALSR
9 d
26 bc
3.6 bc
14
Sampson
ALSR
11 b–d
16 e–g
3.3 c
15
Edgecombe
ALSR
11 b–d
18 d–f
3.8 bc
aData are pooled over experiments and duration of drought stress. Means within a parameter followed by the same letter are not significantly different according to Fisher’s Protected LSD test at .
bAbbreviations: ALSS/GS: acetolactate synthase-inhibitor susceptible and glyphosate-susceptible accession; ALSR: acetolactate synthase inhibitor-resistant accession; GR: glyphosate-resistant accession.