Pusat Pengajian Sains dan Teknologi Makanan

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Browsing Pusat Pengajian Sains dan Teknologi Makanan by Subject "Herbicides -- Environmental aspects"

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    Elucidating mode of 2,4-di-teret-butylphenol action as potential natural herbicide
    (Universiti Malaysia Terengganu, 2017-05) Naimah Abdul Halim
    Nowadays, there is a great demand in discovering new effective natural herbicides with novel mode of action to overcome the rapid development of herbicide resistance issue in weeds. 2,4-di-tert-butylphenol (2,4-DTBP) has been reported to have herbicidal action by generating reactive oxygen species which leads to lipid peroxidation in weeds, but its mode of action remains unclear. This study aimed to elucidate mode of 2,4-DTBP action against two weed species, Hedyotis verticillata and Leptochloa chinensis. 2,4-DTBP caused ultrastructural damage to chloroplasts, including disordered thylakoid systems and undulating membranes, absence of starch grains and increase number of plastoglobuli were evident in both bioassay species three days after treatment. The destroyed chloroplast ultrastructure led to electrolyte leakage, decreased leaf greenness, quantum yield and stomatal conductance values in leaf tissues.
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    Evaluation of herbicidal activities of plant allelochemical, 2, 4-di-tert-butylphenol for natural herbicide development
    (Universiti Malaysia Terengganu, 2016-10) Wan Nur Suzani Sazleen Wan Shafiin
    Herbicides are commonly used to control infestation of weeds. However, excessive use of single herbicide can cause the development of herbicide resistance in weeds, human health concern and pollution. This study aimed to evaluate herbicidal activity of 2,4-Di-tert-butylphenol (2,4-DTBP) and to determine tolerance level of selected crops species to 2,4-DTBP under laboratory and glasshouse conditions. Laboratory bioassay showed that leaf discs of Leptochloa chinensis, Eleusine indica, Hedyotis verticillata and Asystasia gangetica turned dark brown within two days after 2,4-DTBP treatment at 500 mg/L. Further evaluation revealed, post emergence application rate of 7 kg ai/ha caused the seedling growth inhibition of bioassay plants by 15-40 % only under glasshouse conditions, suggesting that 2,4-DTBP has poor post emergence herbicidal activity.