EFFECT OF SOLAR UV RADIATION ON ANTIOXIDANT ENZYMES AND PHENOLS BIOSYNTHESIS IN LETTUCE (Lactuca sativa)
This study aims to evaluate the effect of solar UV radiation on defensive enzymes activities in lettuce seedlings. Seeds of lettuce were grown in high tunnels for 35 days, exposed to three different levels of solar UV, created by using three different types of plastic films. Each plastic film transm...
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| Format: | Article |
| Language: | Arabic |
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The Union of Arab Universities
2015-03-01
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| Series: | Arab Universities Journal of Agricultural Sciences |
| Subjects: | |
| Online Access: | https://ajs.journals.ekb.eg/article_14563_03accb5e8482838206f5b37548ad54f4.pdf |
| _version_ | 1797269722683670528 |
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| author | Mervat A.R. Ibrahim Hany A.M. Srour |
| author_facet | Mervat A.R. Ibrahim Hany A.M. Srour |
| author_sort | Mervat A.R. Ibrahim |
| collection | DOAJ |
| description | This study aims to evaluate the effect of solar UV radiation on defensive enzymes activities in lettuce seedlings. Seeds of lettuce were grown in high tunnels for 35 days, exposed to three different levels of solar UV, created by using three different types of plastic films. Each plastic film transmits different levels of solar UV (0% in UV-B, 4% in UV-L and 83% in UV-T). The obtained results indicated that solar UV radiation has led to significant decrease in seedling fresh weight. UV-B treatment resulted the highest shoot and root length while UV-T treatments exhibited the highest shoot: root ratio. Solar UV radiations have no effect on peroxidase activity in shoots. While ascorbate peroxidase was activated and catalase was inhibited in shoot by UV-T treatments. In lettuce roots, peroxidase, ascorbate peroxidase, and catalase activities were increased by increasing the level of solar UV radiation. In case of UV-T, phenylalanine ammonia lyase (PAL) activity in both shoots and roots of lettuce seedlings was higher than those of other treatments. In addition, Phenols are accumulated in lettuce shoots as a result of UV radiation in UV-L and UV-T treatments. Also, phenols in roots increased by increasing solar UV dose. The study concluded that solar UV radiation induced some antioxidant enzymes, increased the accumulation and biosynthesis of phenolic compounds and reduced lettuce seedlings growth. |
| first_indexed | 2024-04-25T01:52:54Z |
| format | Article |
| id | doaj.art-2f61abe443aa4ff681e170ef2784469a |
| institution | Directory Open Access Journal |
| issn | 1110-2675 2636-3585 |
| language | Arabic |
| last_indexed | 2024-04-25T01:52:54Z |
| publishDate | 2015-03-01 |
| publisher | The Union of Arab Universities |
| record_format | Article |
| series | Arab Universities Journal of Agricultural Sciences |
| spelling | doaj.art-2f61abe443aa4ff681e170ef2784469a2024-03-07T17:43:44ZaraThe Union of Arab UniversitiesArab Universities Journal of Agricultural Sciences1110-26752636-35852015-03-0123110110910.21608/ajs.2015.1456314563EFFECT OF SOLAR UV RADIATION ON ANTIOXIDANT ENZYMES AND PHENOLS BIOSYNTHESIS IN LETTUCE (Lactuca sativa)Mervat A.R. Ibrahim0Hany A.M. Srour1Biochemistry Department, Faculty of Agriculture, Ain Shams University, 68 Hadayek Shoubra, PO 11241 Cairo, EgyptBiochemistry Department, Faculty of Agriculture, Ain Shams University, 68 Hadayek Shoubra, PO 11241 Cairo, EgyptThis study aims to evaluate the effect of solar UV radiation on defensive enzymes activities in lettuce seedlings. Seeds of lettuce were grown in high tunnels for 35 days, exposed to three different levels of solar UV, created by using three different types of plastic films. Each plastic film transmits different levels of solar UV (0% in UV-B, 4% in UV-L and 83% in UV-T). The obtained results indicated that solar UV radiation has led to significant decrease in seedling fresh weight. UV-B treatment resulted the highest shoot and root length while UV-T treatments exhibited the highest shoot: root ratio. Solar UV radiations have no effect on peroxidase activity in shoots. While ascorbate peroxidase was activated and catalase was inhibited in shoot by UV-T treatments. In lettuce roots, peroxidase, ascorbate peroxidase, and catalase activities were increased by increasing the level of solar UV radiation. In case of UV-T, phenylalanine ammonia lyase (PAL) activity in both shoots and roots of lettuce seedlings was higher than those of other treatments. In addition, Phenols are accumulated in lettuce shoots as a result of UV radiation in UV-L and UV-T treatments. Also, phenols in roots increased by increasing solar UV dose. The study concluded that solar UV radiation induced some antioxidant enzymes, increased the accumulation and biosynthesis of phenolic compounds and reduced lettuce seedlings growth.https://ajs.journals.ekb.eg/article_14563_03accb5e8482838206f5b37548ad54f4.pdfuv radiationlettuce (lactuca sativa)peroxidasecatalaseascorbate peroxidasephenolic com-poundsphenyl alanine ammonia lyase |
| spellingShingle | Mervat A.R. Ibrahim Hany A.M. Srour EFFECT OF SOLAR UV RADIATION ON ANTIOXIDANT ENZYMES AND PHENOLS BIOSYNTHESIS IN LETTUCE (Lactuca sativa) Arab Universities Journal of Agricultural Sciences uv radiation lettuce (lactuca sativa) peroxidase catalase ascorbate peroxidase phenolic com-pounds phenyl alanine ammonia lyase |
| title | EFFECT OF SOLAR UV RADIATION ON ANTIOXIDANT ENZYMES AND PHENOLS BIOSYNTHESIS IN LETTUCE (Lactuca sativa) |
| title_full | EFFECT OF SOLAR UV RADIATION ON ANTIOXIDANT ENZYMES AND PHENOLS BIOSYNTHESIS IN LETTUCE (Lactuca sativa) |
| title_fullStr | EFFECT OF SOLAR UV RADIATION ON ANTIOXIDANT ENZYMES AND PHENOLS BIOSYNTHESIS IN LETTUCE (Lactuca sativa) |
| title_full_unstemmed | EFFECT OF SOLAR UV RADIATION ON ANTIOXIDANT ENZYMES AND PHENOLS BIOSYNTHESIS IN LETTUCE (Lactuca sativa) |
| title_short | EFFECT OF SOLAR UV RADIATION ON ANTIOXIDANT ENZYMES AND PHENOLS BIOSYNTHESIS IN LETTUCE (Lactuca sativa) |
| title_sort | effect of solar uv radiation on antioxidant enzymes and phenols biosynthesis in lettuce lactuca sativa |
| topic | uv radiation lettuce (lactuca sativa) peroxidase catalase ascorbate peroxidase phenolic com-pounds phenyl alanine ammonia lyase |
| url | https://ajs.journals.ekb.eg/article_14563_03accb5e8482838206f5b37548ad54f4.pdf |
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