摘要
云南元阳梯田稻田被认为是持续稳定稻田生态系统的典型代表。在元阳梯田原生环境中,通过大田试验,研究UV-B辐射(0、2.5、5.0、7.5kJ·m-2)增强对元阳梯田地方水稻白脚老粳和月亮谷的茎与叶硅含量、叶类黄酮和总酚含量的影响。结果表明:(1)UV-B辐射处理下,白脚老粳拔节期茎和叶的硅含量、月亮谷抽穗期茎的硅含量、拔节期和抽穗期叶的硅含量均显著增加。(2)UV-B辐射导致白脚老粳(除2.5kJ·m-2)和月亮谷抽穗期叶的类黄酮含量显著增加。(3)UV-B辐射导致白脚老粳分蘖期(除2.5kJ·m-2)、拔节期(除2.5kJ·m-2)和抽穗期叶的总酚含量均显著增加;月亮谷分蘖期和抽穗期(除2.5kJ·m-2)叶的总酚含量显著增加。(4)2个水稻品种叶的硅含量与类黄酮、总酚含量均呈极显著正相关。总体来看,UV-B辐射增强促进白脚老粳茎与叶硅含量、叶类黄酮和总酚含量的增加,其增加百分率高于月亮谷,表明白脚老粳和月亮谷对UV-B辐射的抗性有所不同。
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 ul- traviolet-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 2.5kJ·m^-2 , 5.0 kJ·m -2 and 7.5kJ·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 2.5kJ·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 2.5kJ·m^-2 UV-B radiation）, and in heading stage of Baijiaolaojing, in tillering and heading stage（except 2.5kJ·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.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2013年第8期1500-1506,共7页
Journal of Agro-Environment Science
基金
国家自然科学基金(31060083
41205113)
关键词
UV-B辐射
地方水稻品种
硅
类黄酮
总酚
UV-B radiation
local rice varieties
silicon
flavonoids
total phenolic
