【作者】 何永美； 湛方栋； 祖艳群； 陈海燕； 李元；

【Author】 HE Yong-mei, ZHAN Fang-dong, ZU Yan-qun, CHEN Hai-yan, LI Yuan * (College of Resources and Environment, Yunnan Agricultural University, Kunming 650201,China)

【机构】 云南农业大学资源与环境学院；

【摘要】 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和7.5kJ·m-2)增强对元阳梯田地方水稻白脚老粳和月亮谷茎与叶硅含量、叶类黄酮和总酚含量的影响。结果表明:(1)UV-B辐射处理下,白脚老粳孕穗期茎和叶的硅含量,月亮谷抽穗期茎的硅含量,孕穗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),孕穗期(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。更多还原

【Abstract】 A field experiment was carried to investigate the effects of enhanced UV-B radiation with the intensity of 0, 2.5, 5.0 and 7.5 kJ·m -2 on the contents of silicon of the culm and the leaves, flavonoids and total phenolic of the leaves of two local rice varieties, ie Baijiaolaojing and Yuelianggu, in Yuanyang terrace under the native environment. The resuls showed that: (1) The silicon contents of the culm and the leaves in the booting stage of Baijiaolaojing, of culm in the heading stage and of the leaves in the booting 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 the leaves in the heading stage of Baijiaolaojing and Yuelianggu were siginificantly increased under other UV-B radiations. (3) UV-B radiation caused the total phenolic contents of the leaves in the tillering and booting stage (except 2.5 kJ·m -2 UV-B radiation), and in the 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 the contents of silicon and the contents of flavonoids and total phenolic of the leaves of these two local rice varieties was observed. Overall, the encreased percentage of the silicon contents of the culm and the leaves, of the flavonoids and total phenolic contents of the 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.更多还原