TITLE

Chromium-induced depression of N content and nitrate reductase activity in rice seedlings

AUTHOR(S)
Yu, X.-Z.; Zhang, F.-F.; Liu, W.
PUB. DATE
January 2017
SOURCE
International Journal of Environmental Science & Technology (IJE;Jan2017, Vol. 14 Issue 1, p29
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Hydroponic experiments were conducted to investigate the influence of chromium (Cr) exposure on assimilation of N-labeled nitrate in rice ( Oryza sativa L. cv. XZX 45) seedlings. Results showed that exposure of young seedlings to both Cr compounds led to a linear decrease in relative growth rate, nitrate reductase (NR) activity and tissue N accumulation though responses differed between the two Cr variants, in which potassium chromate [Cr(VI)] caused more severe effects than chromium chloride [Cr(III)]. Analysis of subcellular distribution of Cr showed that Cr deposition in cell wall was the highest in tissues of rice seedlings exposed to Cr(III), whereas the largest deposition of Cr in the roots was associated with cytosol in the Cr(VI) treatments. Analysis of a partial correlation between tissue fractions of Cr, NR activity and N content revealed that depression of NR activity in plant materials of rice seedlings exposed to Cr(III) was mainly associated with a decrease in N accumulation, whereas inhibition of NR activity from exposure of plants to Cr(VI) was most likely due to the presence of Cr in cytosol. Information collected here indicated that mechanisms of transport, subcellular distribution and phytotoxicity of the two Cr compounds were different in rice seedlings.
ACCESSION #
120497467

 

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics