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Short-term metabolic responses of soybean root nodules to nitrate.

Abstract：

:Soybean (Glycine max L. Merr.) plants exposed to 10 mM KNO(3) for a 4 d period were used to test the correlation between nitrogenase activity, gene expression and sucrose metabolism. Nitrate caused the down-regulation of sucrose synthase (SS) transcripts within 1 d, although a decline in nodule SS activity and an increase in nodule sucrose content only occurred after 3-4 d. In a second experiment, plants were exposed to (15)N-labelled nitrate for 48 h to determine the time period during which nitrate was taken up, and to relate this to the decline in apparent nitrogenase activity (H(2) production in air) and the reduction in SS gene transcript levels. The peak of nitrate uptake appeared to be between 8 h and 14 h whilst apparent nitrogenase activity began to decline at about 17.5 h. The SS mRNA signal declined markedly between 14 h and 24 h. The correlative association of these factors is clear. However, SS activity per se does not appear to be related to the initial decline in apparent nitrogenase activity as a result of nitrate uptake. These findings, therefore, do not support the hypothesis that the regulation of nodule function is mediated by the regulation of SS activity.

journal_name

J Exp Bot

journal_title

Journal of experimental botany

authors

Gordon AJ,Skøt L,James CL,Minchin FR

doi

10.1093/jexbot/53.368.423

keywords:

subject

Has Abstract

pub_date

2002-03-01 00:00:00

pages

423-8

issue

368

eissn

0022-0957

issn

1460-2431

journal_volume

53

pub_type

杂志文章

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