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Legume Genomics and Genetics 2012, Vol.3, No.2, 8
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Table 1 The inhibition effects of three plant extracts on dodder’s growth and development and on host’s damage
Note: Data of the experiment in the table was the value of the average ± standard error repeated five times; Multiple comparisons
were done with Duncan new multiple range method, and there is no significant difference (p<0.05) among the same letters after the
same column by Duncan test
2 Discussion
It is crucial to the chemical control of dodder in
protecting the normal growth of the host plant; the use
of plant extracts is an attempt for prevention and
treatment of dodder. After studying the effects of
several weed extracts on the growth of dodder and its
host, Hobib and Abdual Rahman (1988) pointed out
that the Burmudagrass methanol extract included
substances that suppressed dodder growth and affected
the security of the host alfalfa, in addition, and there
were 10 components identified. Zhou et al (2008)
pointed out that the extracts of
Eucalyptus
,
Sapium
,
Melia
all had the active substances for deinsectization
and weeding (Wei, 2005; lin et al., 2007; Zhou et al.,
2008); Jiang (2004) indicated that mersosin was the
major active substance in
Melia azedarach
bark. The
results of this study showed that
Eucalyptus robusta
leaves extract at the high concentration (0.25 g/mL)
Dodder
Soybean
Plant
extracts
Concentration
(g/mL)
Symptom
Damage
degree (%)
Fresh weight
(g/plant)
Symptom
Damage
degree (%)
Fresh weight
(g/plant)
0.00
Normal growth
and development
0.0
0.145±0.01a
Normal growth and
development
0.0
2.6±0.19b
0.01
No wilting, slow
growing
16.0
0.134±0.03a
Leaves yellowing
8.0
2.1±010ab
0.05
Part wilting,
loose twining
44.0
0.104±0.01a
Dead spots partly
appearing in leaves
22.0
1.8±0.12a
Eucalyptus
leaves
0.25
Wilting, dead
70.0
0.115±0.03a
Dead spots fully
appearing in leaves
64.0
1.9±0.29a
0.00
Normal growth
and development
0.0
0.l27±0.02a
Normal growth and
development
0.0
2.7±0.12a
0.01
No obvious
damage
6.0
0.12±0.02a
Chlorotic leaves
appearing
7.0
2.9±0.33a
0.05
Wilting, few
twines
44.0
0.108±0.02a
Leaves partly
Appearing dead
24.0
2.6±0.37a
Sapium
sebiferum
leaves
0.25
Same as above
48.0
0.103±0.03a
Lots of leaves dead
54.0
2.9±0.19a
0.00
Normal growth
and development
0.0
0.153±0.01a
Normal growth and
development
0.0
2.6±0.19a
0.01
No wilting, slow
growing
18.0
0.154±0.05a
not obvious hurt
4.0
2.7±0.34a
0.05
Slowly grow,
few twine
30.0
0.105±003a
Leaves yellowing
10.0
2.2±0.25a
Melia
azedarachn
leaves
0.25
Wilting, Half of
leaves death
60.0
0.065±0.01a
Large area dead
spots appearing in
leaves
58.0
2.0±0.16a
0.00
Normal growth
and development
0.0
0.121±0.02a
Normal growth and
development
0.0
2.6±0.19a
0.01
Slow growing,
few twine
28.0
0.081±0.01a
No obvious hurt
4.0
3.1±0.51a
0.05
Wilting, no
twine
54.0
0.101±0.01a
No obvious hurt
5.0
2.5±0.32a
Melia
azedarach
bark
0.25
Mostly dead
78.0
0.08±0.01a
Leaves yellowing
slightly
7.0
2.5±0.27a