Allelopathic effect of imperata cylindrica (L.) beauv. extracts on the germination of weeds
In this study, the allelopathic effect of Imperata cylindrica has been investigated. Aqueous extracts of Imperata cylindrica were tested at concentrations of 31.25, 62.5, and 125 mg/ml to study different parameters on Cucumis sativus and Lolium perenne Similarly, allelopathic effect of Imperat...
Saved in:
| Main Author: | |
|---|---|
| Format: | Thesis |
| Language: | English English English |
| Published: |
2020
|
| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/909/1/24p%20MOHAMED%20ALI%20A%20SALIM.pdf http://eprints.uthm.edu.my/909/2/MOHAMED%20ALI%20A%20SALIM%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/909/3/MOHAMED%20ALI%20A%20SALIM%20WATERMARK.pdf http://eprints.uthm.edu.my/909/ |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Institution: | Universiti Tun Hussein Onn Malaysia |
| Language: | English English English |
| Summary: | In this study, the allelopathic effect of Imperata cylindrica has been investigated.
Aqueous extracts of Imperata cylindrica were tested at concentrations of 31.25, 62.5,
and 125 mg/ml to study different parameters on Cucumis sativus and Lolium perenne
Similarly, allelopathic effect of Imperata cylindrica root and shoot 70 % ethanol
extract fractions (obtained by different polarity solvents), that is, A, B, C, and D,
were also tested at 0.125, 0.25, and 0.5 mg/ml concentrations on four different
plants; Linum usitatissimum, Lolium perenne, Macroptilim lathyroides, and Phalaris
canariensis. Distilled water and glyphosate were used as negative and positive
control, respectively. Various factors were studied to determine the inhibition and
growth of root and shoot length, percentage germination, and fresh and dry weight.
Results indicated that the extracts of Imperata cylindrica may contain
allelochemicals which may contribute to its invasiveness and extreme
competitiveness. While the gas chromatography-mass spectroscopy analysis (GC�MS) of active fractions revealed the presence of allelochemicals including phenolic
acid, fatty acids, and organosilicon compounds. Although phenolic acids [butyl
phenol, phenyl 3-methylbut-2-enoate, p-coumaric acid, and p-coumaric acid methyl
ester], fatty acids [phytol, methyl isohexadecanoate, palmitic acid, palmitic acid
methyl ester, (9,12-Octadecadienoic acid, ethyl ester), (9Z, 12Z, 15Z�Octadecatrienoic acid, ethyl ester)], and organosilicon compounds [silicic acid,
diethyl bis(trimethylsilyl) ester and cyclotrisiloxane, hexamethyl] detected in shoot
and root extract were similar in some compounds, however, they show difference in
phytotoxicity. 125 mg/ml of shoot aqueous extract and 0.5 mg/ml of fraction (B)
shoot were the highest concentrations that affected the germination of weeds. The
results show that Imperata cylindrica contains allelochemical compounds that are
released from the root and shoots parts under different favorable conditions have the
capability to contribute towards inhibition and stimulation in germination, lengths
growth and decrease in the biomasses of other plant species. |
|---|