Journal ArticleDOI
Nitrate reduction in the roots and shoots of wheat seedlings.
P. L. Minotti,William A. Jackson +1 more
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TLDR
Total NO3-reduction by intact low-N cultures over the 24-hr period was comparable to that of high-NO3-cultures in spite of the fact that in vitro nitrate reductase activity of the former did not reach the levels found initially or at the end of the period in the latter.Abstract:
Intact wheat seedlings cultured in high nitrate solutions (high-NO
3
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cultures) reduced NO
3
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when placed for 24 hr in dilute CaSO4 solutions although they leaked NO
3
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back to solution during this period. Most of the reduction seemed to occur in shoots since in parallel experiments detached shoots reduced nearly as much of the previously absorbed NO
3
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as intact cultures. Detached roots leaked greater quantities of NO
3
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back to solution than did intact cultures, and failed to reduce any of their previously absorbed NO
3
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during the experimental period. Seedlings of identical age cultured without a nitrogen source and rich in carbohydrate reserves (low-N cultures) rapidly absorbed NO
3
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from dilute Ca(NO3)2 solutions and reduced 80% of that absorbed. Detached low-N roots also absorbed NO
3
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and reduced 40% of that absorbed. Total NO
3
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reduction by intact low-N cultures over the 24-hr period was comparable to that of high-NO
3
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cultures in spite of the fact that in vitro nitrate reductase activity of the former did not reach the levels found initially or at the end of the period in the latter, and that the total NO
3
-
absorbed by low-N cultures was less than that initially present in high-NO
3
-
cultures.read more
Citations
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Journal ArticleDOI
NITROGEN ASSIMILATION AND TRANSPORT IN VASCULAR LAND PLANTS IN RELATION TO INTRACELLULAR pH REGULATION
John A. Raven,F. A. Smith +1 more
TL;DR: In this paper, it was shown that the assimilation of ammonium ion in plant cell cytoplasm produces at least one H+ per NH+4; N2 fixation generates 0.1-0.2 H+/OH per N assimilated; NO-3 assimilation produces almost one OH/OH- per NO+3.
Journal ArticleDOI
The Assimilatory Nitrate-Reducing System and its Regulation
TL;DR: The present study focuses on the application of NAD(P)H-nitrate reductase to the reduction of Nitrite to Nitrite and the role of ferredoxin in this process.
Book ChapterDOI
Nitrate Accumulation in Vegetables
TL;DR: A straightforward relationship between the nitrate concentration of outer leaves of head lettuce and the amounts of fertilizer-nitrite applied within a given planting date and nitrite source is presented in this paper.
Journal ArticleDOI
Selectivity and Kinetics of Ion Uptake by Barley Plants Following Nutrient Deficiency
Book ChapterDOI
Aspects of the Comparative Physilogy of Grain Yield in Cereals
L. T. Evans,I.F. Ward law +1 more
TL;DR: The chapter describes the reproductive development of cereals, including juvenile stage, vernalization, response to daylength, and inflorescence development, and the major roles of the root system of crops are to obtain essential nutrients and water from the soil and to support the plants.
References
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Journal ArticleDOI
The estimation of carbohydrates in plant extracts by anthrone.
E. W. Yemm,A. J. Willis +1 more
Journal ArticleDOI
Nitrate Reductase Activity in Corn Seedlings as Affected by Light and Nitrate Content of Nutrient Media
Richard H. Hageman,Donna Flesher +1 more
TL;DR: It was shown that both light and nitrate are necessary for the formation of nitrate reductase in quantities required by the plant for normal growth.