Chutipaijit, Sutee

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Chutipaijit, Sutee
Alternative Name
Chutipaijit, S.
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Email
sutee.ch@kmitl.ac.th

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    Modifications of morphological and physiological characteristics of pigmented-rice seedlings by application of titanium dioxide nanoparticles
    (2018-09-05)
    Samart, Sutichai
    ;
    Chutipaijit, Sutee
    Nanomaterials or metal nanoparticles are considered as the agricultural applications with significant response-promoting influence. This research was focused on the influence of titanium dioxide nanoparticles (TiO<inf>2</inf> NPs) on morphological and physiological processes in pigmented-rice plants at seedling stage. A significant influence of TiO<inf>2</inf> NPs on the plant growth, photosynthetic pigment contents and antioxidant enzyme activities in rice seedlings was investigated. The results were also shown that pigmented-rice seedlings growing in TiO<inf>2</inf> NPs application significantly differed in the morphological and physiological responses when compared with the control plants. The results presented the plant height and dry weight was significantly affected by TiO<inf>2</inf> NPs. The results observed an increase in chlorophyll A, chlorophyll B, carotenoid contents and catalase, peroxidase enzyme activities in plant seedlings of TiO<inf>2</inf> NPs-treated plants which positive-corresponded with plant growth performances was found. TiO<inf>2</inf> NPs-treated seedlings that a high level of TiO<inf>2</inf> NPs application exhibited an increase in the plant growth, photosynthetic pigment contents and antioxidant enzyme activities. The amelioration effect of 800 mg L<sup>-1</sup> of TiO<inf>2</inf> NPs application was shown the highest performances in morphological and physiological responses when compared with the other treatments. Investigation of the results suggests that the morphological and physiological responses due to changes in the plant growth, photosynthetic pigment content and antioxidant enzyme activity parameters may derive from the interaction between TiO<inf>2</inf> NPs and plant cells of pigmented-rice seedlings, which are known to play a role in plant development and productivity in the further study.
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    Assessment of antioxidant enzymes in response to exogenous titanium dioxide (TiO2) nanoparticles in Chainat 1 rice cultivar
    (2018-01-01)
    Samart, Sutichai
    ;
    Phakamas, Nittaya
    ;
    Chutipaijit, Sutee
    Antioxidant enzymes are important to prevent the destruction of photosynthetic pigments in plant cells. There have been reported that ZnO nanoparticles can promote activities of antioxidant enzymes in rice, but should not use in high activities because it can cause toxicity. Therefore, the objective of this study was to investigate the effect of titanium dioxide (TiO<inf>2</inf>) nanoparticles on the activities of antioxidant enzymes in Chainat 1 rice cultivar. Rice plants were treated with TiO<inf>2</inf> nanoparticles using different concentrations i.e., 0, 100, 200, 400, 600 and 800 mg.L<sup>-1</sup> for every 7 days-interval. Photosynthetic pigment contents (chlorophyll A, chlorophyll B and carotenoid) and activities of antioxidant enzymes (catalase and peroxidase) were recorded at 37, 44 and 51 days after planting. The results showed that the treatment of TiO<inf>2</inf> nanoparticles was not effect on the quantities of chlorophyll A, chlorophyll B and carotenoids, but found that the activities of peroxidase and catalase enzymes were significant affected at all growth stages. Especially, at a concentration of 200 mg.L<sup>-1</sup> TiO<inf>2</inf> found that rice plants contained the highest activities of peroxidase enzyme and significant difference from control treatment. However, the treatments of higher dose than 200 mg.L<sup>-1</sup> TiO<inf>2</inf> would have a chance to meet toxicity in rice plants as the activities of antioxidant enzymes were decreased.