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| Effects of UV-B Radiation on the Contents of Silicon, Flavonoids and Total Phenolic of Two Local Rice Varieties in Yuanyang Terrace Under Field Conditions |
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| KeyWord:UV-B radiation; local rice varieties; silicon; flavonoids; total phenolic |
| Author Name | Affiliation | | HE Yong-mei | College of Resource and Environment, Yunnan Agricultural University | | ZHAN Fang-dong | College of Resource and Environment, Yunnan Agricultural University | | ZU Yan-qun | College of Resource and Environment, Yunnan Agricultural University | | CHEN Hai-yan | College of Resource and Environment, Yunnan Agricultural University | | LI Yuan | College of Resource and Environment, Yunnan Agricultural University |
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| Abstract: |
| The local paddle field in Yuanyang Terrace was considered as a sustainable and stable agricultural ecosystem. Two local rice varieties, Baijiaolaojing and Yuelianggu, were grown in the paddy field for two consecutive years under ambient and supplemental levels of ultraviolet-B（UV-B, 280~315 nm） radiation to determine the potential for alterations in contents of silicon in culm and leaves, of flavonoids and total phenolic in leaves. The supplemental UV-B radiation was 2.5 kJ·m-2, 5.0 kJ·m-2 and 7.5 kJ·m-2, simulating a depletion of 10%, 20% and 30% stratospheric ozone. The results showed that：（1）The silicon contents of culm and leaves in jointing stage of Baijiaolaojing, of culm in heading stage and of leaves in jointing and heading stage of Yuelianggu were siginificantly increased under UV-B radiation.（2）Except 2.5 kJ·m-2 UV-B radiation, the flavonoids contents of leaves in heading stage of Baijiaolaojing and Yuelianggu were siginificantly increased under other UV-B radiations.（3）UV-B radiation caused the total phenolic contents of leaves in tillering and jointing stage（except 2.5 kJ·m-2 UV-B radiation）, and in heading stage of Baijiaolaojing, in tillering and heading stage（except 2.5 kJ·m-2 UV-B radiation） of Yuelianggu to significantly enhance.（4）That the very significant positive correlation was between contents of silicon and contents of flavonoids and total phenolic of leaves of these two local rice varieties was observed. Overall, the encreased percentage of silicon contents of culm and leaves, of the flavonoids and total phenolic contents of leaves that was caused by UV-B radiation of Baijiaolaojing was more than that of Yuelianggu, which indicated that the resistance to UV-B radiation was different to some extent between Baijiaolaojing and Yuelianggu. |
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