Antioxidative and growth-promoting effect of selenium on senescing lettuce

	Antioxidative and growth-promoting effect of selenium on senescing lettuce
	Xue, TL ; Hartikainen, H ; Piironen, V
刊名	PLANT AND SOIL
	2001-11-01
卷号	237 期号:1 页码:55-61
关键词	Antioxidant Gsh-px Lettuce Selenium Senescence Sod Tocopherol
文献子类	Article
英文摘要	In human and animal cells, Se plays an essential role in antioxidation and exerts an antiaging function but it is toxic at high dietary intake. To increase its intake in forage and foodstuffs, Se fertilization is adopted in some countries where soils are low in bioavailable Se, even though higher plants are regarded not to require Se. To test its ability to counteract senescence-related oxidative stress in higher plants, a pot experiment was carried out with lettuce (Lactuca sativa) cultivated with increasing amounts of H(2)SeO(4). The yields harvested 7 or 14 weeks after sowing revealed that a low Se dosage (0.1 mg kg(-1) soil) stimulated the growth of senescing seedlings (dry weight yield by 14%) despite a decreased chlorophyll concentration. The growth-promoting function was related to diminished lipid peroxidation. In young and senescing plants, the antioxidative effect of Se was associated with the increased activity of glutathione peroxidase (GSH-Px). In the senescing plants, the added Se strengthened the antioxidative capacity also by preventing the reduction of tocopherol concentration and by enhancing superoxide dismutase (SOD) activity. When no Se was added, tocopherols and SOD activity diminished during plant senescence. The higher Se dosage (1.0 mg kg(-1) soil) was toxic and reduced the yield of young plants. In the senescing plants, it diminished the dry weight yield but not the fresh weight yield.
WOS关键词	WHITE-MUSCLE DISEASE ; IODOTHYRONINE DEIODINASE ; GLUTATHIONE-PEROXIDASE ; PLANT-GROWTH ; VITAMIN-E ; SELENOPROTEIN ; ETHYLENE ; TISSUE ; PURIFICATION ; IRRADIATION
语种	英语
出版者	SPRINGER
WOS记录号	WOS:000172861900006
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/68307]
专题	中国科学院地理科学与资源研究所
通讯作者	Hartikainen, H
作者单位	1.Univ Helsinki, Dept Appl Chem & Microbiol, SF-00014 Helsinki, Finland 2.Chinese Acad Sci, Inst Geog, Beijing 100101, Peoples R China
推荐引用方式 GB/T 7714	Xue, TL,Hartikainen, H,Piironen, V. Antioxidative and growth-promoting effect of selenium on senescing lettuce[J]. PLANT AND SOIL,2001,237(1):55-61.
APA	Xue, TL,Hartikainen, H,&Piironen, V.(2001).Antioxidative and growth-promoting effect of selenium on senescing lettuce.PLANT AND SOIL,237(1),55-61.
MLA	Xue, TL,et al."Antioxidative and growth-promoting effect of selenium on senescing lettuce".PLANT AND SOIL 237.1(2001):55-61.