On the 50th Anniversary of Our SocietyHanson, J. B.
doi: 10.1104/pp.54.4.419pmid: 16658903
Article PDF first page preview Close This content is only available as a PDF. © 1974 American Society of Plant Biologists This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model)
Conceptual Developments in Photosynthesis, 1924-1974Myers, Jack
doi: 10.1104/pp.54.4.420pmid: 16658904
Article PDF first page preview Close This content is only available as a PDF. © 1974 American Society of Plant Biologists This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model)
Plant Photobiology in the Last Half-Century Galston, Arthur W.
doi: 10.1104/pp.54.4.427pmid: 16658905
1 Dedicated to the memory of Harry A. Borthwick, a wise and compassionate man. Generous support from the National Science Foundation has made possible the author's active involvement in this field for more than 20 years. Article PDF first page preview Close This content is only available as a PDF. © 1974 American Society of Plant Biologists This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model)
Conceptual Developments in Metabolic Control, 1924-1974 Beevers, Harry
doi: 10.1104/pp.54.4.437pmid: 16658906
Abstract A brief sketch is given of the development of the understanding of the respiratory mechanism in plants over the past 50 years. Against this background the following aspects of control are discussed: (a) nonreversibility of catabolic sequences; (b) compartmentation of reactions and reactants; (c) control by amount of enzyme; (d) control by NAD and NADP; (e) control by ADP supply; (f) pacemaker reactions in glycolysis; and (g) control at branch points: further examples of allostery. 1 The research in my laboratory has been supported by National Science Foundation Grant GB 35376 and Atomic Energy Commission Contract AT(04-3)34. This content is only available as a PDF. © 1974 American Society of Plant Biologists This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model)
Biological Nitrogen Fixation, 1924-1974Burris, Robert H.
doi: 10.1104/pp.54.4.443pmid: 16658907
Article PDF first page preview Close This content is only available as a PDF. © 1974 American Society of Plant Biologists This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model)
Fifty Years of Plant Hormone ResearchThimann, Kenneth V.
doi: 10.1104/pp.54.4.450pmid: 16658908
Article PDF first page preview Close This content is only available as a PDF. © 1974 American Society of Plant Biologists This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model)
Fifty Years of Progress in Water Relations ResearchKramer, Paul J.
doi: 10.1104/pp.54.4.463pmid: 16658910
Abstract Many of the basic concepts dealing with soil and plant water relationships were in existence 50 years ago, but were inadequately presented in the textbooks of that time. There has been a marked increase in the amount of work done in this field during recent decades, but much of it involves advances in understanding the concepts already in existence. Three of the most important advances in the field of water relations are: (a) acceptance of the term, water potential, to describe the free energy status of water in soil and plants; (b) marked improvement in methods of measuring water potential and stomatal resistance; and (c) use of the concept of water flow in the soil-plant system as analogous to flow of electricity in a conducting system. A number of interesting and important problems remain to be studied. Of these, probably the most important is to learn why mild water stress of less than - 10 bars can affect various enzyme-mediated metabolic processes. Plant scientists in applied fields also need to learn more about the causes of differences in ability to tolerate drought among plants of various kinds. There is uncertainty concerning the relative magnitude of the resistances to water flow in various parts of the soil-plant system and concerning the causes of the apparent changes in resistance to water flow with increase in rate and with time of day. More information also is needed concerning the role of growth regulators synthesized in roots and the importance of the older, suberized roots in the absorption of water and mineral nutrients. This content is only available as a PDF. © 1974 American Society of Plant Biologists This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model)
Long Distance TransportZimmermann, Martin H.
doi: 10.1104/pp.54.4.472pmid: 16658911
Article PDF first page preview Close This content is only available as a PDF. © 1974 American Society of Plant Biologists This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model)
Dependence of Nitrite Reduction on Electron Transport Chloroplasts Neyra, C. A.; Hageman, R. H.
doi: 10.1104/pp.54.4.480pmid: 16658912
Abstract Methyl viologen and phenazine methosulfate (photosystem I electron acceptors), 3-(3,4-dichlorophenyl)-1, 1-dimethylurea (DCMU, electron-transport inhibitor), and methylamine (photophosphorylation uncoupler) were used to study the dependence of nitrite reduction on electron transport in chloroplasts. DCMU, methyl viologen, and phenazine methosulfate markedly inhibited, whereas methylamine stimulated NO2− reduction in isolated, intact spinach (Spinacia oleracea L.) chloroplasts. The addition of DCMU to leaf sections of spinach and corn, (Zea mays L. var. XL81), incubated with No3−, caused no inhibition of nitrate reduction but inhibited nitrite reduction leading to the accumulation of NO2− in the light. The addition of methylamine to comparable leaf sections did not affect either nitrate or nitrite reduction. We concluded that: (a) nitrite reduction is functionally associated with the electron transport arising from the light reactions of the chloroplast and this provides additional support for the localization of nitrite reductase in the chloroplast; (b) nitrite reduction is associated with photosystem I and ferredoxin is the most likely donor in leaf tissue; and (c) ATP is not involved directly in nitrite reduction. However, ATP synthesis, by regulating electron flow to photosystem I, can affect nitrite reduction in the light. 2 Permanent address: Departamento de Biologia, Universidad Agraria La Molina, Lima, Peru. 1 This work was supported in part by Hatch funds and a Frasch Foundation Grant. C.A.N. gratefully acknowledges the assistance of a fellowship grant from Midwest Universities Consortium for International Aid. Universidad Agraria La Molina, Peru. This content is only available as a PDF. © 1974 American Society of Plant Biologists This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model)