Phytotoxic potential of essential oil from leaves of eucalyptus tereticornis against rice (orza sativa) and its weeds, echinochloa grus-galli and cyperus rotundus
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Date
2016, 2016
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Central University of Punjab
Abstract
The present study was undertaken to explore the phytotoxic potential of essential oil from Eucalyptus tereticornis against two major weeds of rice viz. Echinochloa crus-galli and Cyperus rotundus. The effect of essential oil was studied on growth
(percent germination, root length and shoot length development) physiological
parameters (chlorophyll content and percent respiration) and biochemical changes
in macromolecule content (protein and carbohydrate) under controlled conditions in
the laboratory. Studies revealed that Eucalyptus tereticornis essential oil (in
different concentrations ranging from 25 to 250 µg/ml) adversely affected the
growth and physiology of all the test plants. However the effect was more
predominant in weeds compare to the rice seedlings. When the seeds of test plants
were exposed to 100 and 250 µg/ml oil concentration, seed germination and
seedling development of test weeds were highly affected as compare to the rice. C.
rotundus was found to be the most sensitive weed among test plants. In chlorophyll
content, the percent reduction at 250 µg/ml of essential oil was 60% 80% and 99%
in O. sativa, E. crus-galli and C. rotundus, respectively. Similarly, reduction in
respiratory activity on exposure to 250 µg/ml of essential oil was 20% 40% and
99% in O. sativa, E. crus-galli and C. rotundus, respectively. The effect of essential
oil on macromolecules, i.e. carbohydrates and proteins also followed the similar
trend. The percent reduction in protein content was approximately 40%, 60% and
80% and percent reduction in carbohydrate content was 25% 60% and 90% in O.
sativa, E. crus-galli and C. rotundus, respectively on exposure to 100 µg/ml of
essential oil. The present study concludes that essential oil of E. tereticornis shows the toxicity selectively towards the E. crus-galli and C. rotundus compare to O.sativa.
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Keywords
Essential Oil, Eucalyptus tereticornis, Cyprus rotundus, Echinochloa crus-galli, Rice (Oryza sativa)
Citation
Vishavkarma, Gajendra Singh (2016) Phytotoxic potential of essential oil from leaves of eucalyptus tereticornis against rice (orza sativa) and its weeds, echinochloa grus-galli and cyperus rotundus