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	Iron plaque outside roots affects selenite uptake by rice seedlings (oryza sativa l.) grown in solution culture
	Zhou, Xin-Bin; Shi, Wei-Ming; Zhang, Lian-He
刊名	Plant and soil
	2007
卷号	290期号:1-2页码:17-28
关键词	Iron plaque Rice Selenite uptake Translocation Xylem exudates
ISSN号	0032-079X
DOI	10.1007/s11104-006-9072-9
通讯作者	Shi, wei-ming(wmshi@issas.ac.cn)
英文摘要	A hydroponics experiment was conducted to investigate the effects of iron plaque on root surfaces with respect to selenite uptake and translocation within the seedlings of two cultivars of rice (oryza sativa l. cv xiushui48 and bing9652). different amounts of iron plaque were formed by adding 0, 10, 30, 50, 70 mg fe l(-1) in the nutrient solution. after 24 h of growth, the amount of iron plaque was positively correlated with the fe2+ addition to the nutrient solution. these concentrations of fe, inducing plaque, had no significant effect on the shoot and root growth of rice plants in 50 mu g se l(-1) nutrient solution. the amount of se accumulated in iron plaque was positively correlated to the amount of iron plaque. increasing iron plaque decreased the selenium concentration in shoots and in roots. at the same time, the translocation of se from roots to shoots was reduced with increasing amounts of iron plaque. at both the shorter and longer exposure times, the ratio of root-to-shoot selenium was higher than in the controls. more se stayed in the roots at the longer exposure time than at the shorter time. the concentration of selenium in the xylem sap was sharply decreased with increasing amount of iron plaque on the rice roots. the dcb (dithionite-citrate-bicarbonate)-extracted se was up to 89.9-91.1% of the total se when roots with iron plaque (fe 70) were incubated in 50 mu g se l(-1) solution for 30 min. this dcb-extracted se, however, accounted for only 21.9-28.7% of total se when roots with iron plaque were incubated in the same solution for 3 days. se adsorbed in iron plaque can be desorbed by low-molecular-weight organic acids, similar to the desorption of se from ferrihydrite. these results suggest that iron plaque might act as a 'buffer' for se in the rhizosphere.
WOS关键词	WEIGHT ORGANIC-ACIDS ; HYDROUS FERRIC-OXIDE ; TYPHA-LATIFOLIA ; CADMIUM RELEASE ; NUTRIENT-UPTAKE ; EXCESS COPPER ; ZINC UPTAKE ; SOILS ; SORPTION ; PLANTS
WOS研究方向	Agriculture ; Plant Sciences
WOS类目	Agronomy ; Plant Sciences ; Soil Science
语种	英语
出版者	SPRINGER
WOS记录号	WOS:000243624400002
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2380652
专题	中国科学院大学
通讯作者	Shi, Wei-Ming
作者单位	1.Chinese Acad Sci, Inst Soil Sci, State Key Lab Soil & Sustainable Agr, Nanjing 210008, Peoples R China 2.Chinese Acad Sci, Grad Sch, Beijing 100081, Peoples R China 3.Henan Univ Sci & Technol, Coll Agr, Luoyang 471003, Peoples R China
推荐引用方式 GB/T 7714	Zhou, Xin-Bin,Shi, Wei-Ming,Zhang, Lian-He. Iron plaque outside roots affects selenite uptake by rice seedlings (oryza sativa l.) grown in solution culture[J]. Plant and soil,2007,290(1-2):17-28.
APA	Zhou, Xin-Bin,Shi, Wei-Ming,&Zhang, Lian-He.(2007).Iron plaque outside roots affects selenite uptake by rice seedlings (oryza sativa l.) grown in solution culture.Plant and soil,290(1-2),17-28.
MLA	Zhou, Xin-Bin,et al."Iron plaque outside roots affects selenite uptake by rice seedlings (oryza sativa l.) grown in solution culture".Plant and soil 290.1-2(2007):17-28.

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