Teerarak, Montinee

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Teerarak, Montinee
Alternative Name
Teerarak, M.
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Email
montinee.te@kmitl.ac.th

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    Potential allelopathic effects of Suregada multiflorum and the influence of soil type on its residue's efficacy
    (2010-09-01)
    Laosinwattana, Chamroon
    ;
    Boonleom, Chaninat
    ;
    Teerarak, Montinee
    ;
    Thitavasanta, Sompop
    ;
    Charoenying, Patchanee
    This experiment was conducted to determine the potential allelopathic effects of the aqueous extracts and dried leaf powder of Suregada multiflorum and to find the herbicidal effects of its granule on the weed species, barnyardgrass (Echinochloa crus-galli) and slender amaranth (Amaranthus viridis), in various growth media (germination paper, sand, and soil). Observations in this study demonstrated that the potential and magnitude of their inhibitory effects varied among the plant parts. The leaves and branches possessed the strongest inhibition levels, followed by the bark. The aqueous extract from the leaves of S. multiflorum had a remarkably stronger inhibitory effect on the germination and growth of slender amaranth, compared with barnyardgrass; when applied at the concentration of 100-g-L<sup>-1</sup>, it completely inhibited the germination and initial seedling growth of slender amaranth. In addition, all the treatments of the dried leaf powder had stronger inhibition effects than the aqueous extract. Interestingly, the inhibitory effects of the dried leaf granule of S. multiflorum were stronger than the effects of the dried leaf powder at equal rates. The degree of inhibitory effect of the S. multiflorum granule, applied in various growing media, can be classified in order of decreasing inhibition as germination paper = sand > clay soil. The present study indicates that the S. multiflorum granule product that was developed in this research has the potential to provide a powerful organic herbicide for controlling slender amaranth. © 2010 The Authors. Journal compilation © 2010 Weed Science Society of Japan.
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    The impact of sodium chloride on root growth, cell division, and interphase silver-stained nucleolar organizer regions (AgNORs) in root tip cells of Allium cepa L.
    (2009-06-17)
    Teerarak, Montinee
    ;
    Bhinija, Kisana
    ;
    Thitavasanta, Sompop
    ;
    Laosinwattana, Chamroon
    To evaluate genetic damage, parameters including root growth, chromosomal aberrations, and interphase silver-stained nucleolar organizer regions (AgNORs) in root tip cells of Allium cepa L. were investigated after treatment with NaCl (40-160 mM). The results showed that NaCl caused a decrease in root growth. All concentrations of NaCl showed an inhibitory effect on dividing cells in root tips of A. cepa L. and caused a reduction in mitotic index values. Upon exposure to NaCl, roots exhibited various mitotic abnormalities, including c-mitosis, anaphase bridge, and chromosome stickiness. In addition, interphase cells with micronuclei, budding nuclei, and unequal-sized nuclei were observed. Moreover, total cell aberration increased with increasing NaCl concentration. For AgNOR parameters, the average number of AgNORs per nucleus decreased in roots treated at all NaCl concentrations. The singular AgNOR area and whole AgNOR area in the nucleus containing 1-3 AgNORs were inversely proportional to NaCl concentrations. © 2009 Elsevier B.V. All rights reserved.