J. K. Heyes

Journal Article Early Responses of Excised Stem Segments to Auxins Get access PAULINE PENNY, PAULINE PENNY Department of Botany and Zoology, Massey University Search for other works by this author on: Oxford Academic PubMed Google Scholar DAVID PENNY, DAVID PENNY Department of Botany and Zoology, Massey University Search for other works by this author on: Oxford Academic PubMed Google Scholar DAVID MARSHALL, DAVID MARSHALL Department of Botany and Zoology, Massey University Search for other works by this author on: Oxford Academic PubMed Google Scholar J. K. HEYES J. K. HEYES Applied Biochemistry DivisionD.S.I.R. Palmerston North, New Zealand Search for other works by this author on: Oxford Academic PubMed Google Scholar Journal of Experimental Botany, Volume 23, Issue 1, February 1972, Pages 23–36, https://doi.org/10.1093/jxb/23.1.23 Published: 01 February 1972 Article history Received: 25 March 1971 Published: 01 February 1972

Abstract In this investigation, the changes in the RNA and DNA complement of the cell have been studied during expansion and differentiation in the root. It has been shown that during expansion the RNA content per cell increases fourfold and the DNA content twofold. While the total RNA is increasing its base composition is changing. This, however, is related to changes in the relative proportions of two fractions the base composition of each of which remains constant. The base composition of the DNA does not change, but its susceptibility to acid treatment increases. It is suggested that the changing proportions of the two RNA fractions are due to a progressively partial enzymic degradation of the initial RNA complement, and these results may be of significance for the interpretation of the mechanism of cell growth in connexion with the changing catalytic pattern supported by the protein of the cell.

G. M. Brooke, R. D. Chambers, J. Heyes and W. K. R. Musgrave, J. Chem. Soc., 1964, 729 DOI: 10.1039/JR9640000729

Research Article| September 01 1951 The constitution of hexadecatrienoic acid from the glycerides of rape (Brassica napus L.) leaf J. K. Heyes; J. K. Heyes 1Fats Research Laboratory, Department of Scientific and Industrial Research, Wellington, New Zealand Search for other works by this author on: This Site PubMed Google Scholar F. B. Shorland F. B. Shorland 1Fats Research Laboratory, Department of Scientific and Industrial Research, Wellington, New Zealand Search for other works by this author on: This Site PubMed Google Scholar Biochem J (1951) 49 (4): 503–506. https://doi.org/10.1042/bj0490503 Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Facebook Twitter LinkedIn MailTo Cite Icon Cite Get Permissions Citation J. K. Heyes, F. B. Shorland; The constitution of hexadecatrienoic acid from the glycerides of rape (Brassica napus L.) leaf. Biochem J 1 September 1951; 49 (4): 503–506. doi: https://doi.org/10.1042/bj0490503 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentAll JournalsBiochemical Journal Search Advanced Search This content is only available as a PDF. © 1951 CAMBRIDGE UNIVERSITY PRESS1951 Article PDF first page preview Close Modal You do not currently have access to this content.

This investigation is a study of differentiation in the apical region of the shoot in terms of the protein content and respiration of the dome and of each of the first seven primordia and internodes. The results obtained have been compared with others reported earlier showing the volumes and number of cells of each morphological component of the same system. It has been shown that internodal cells tend to have a higher content but a lower concentration of protein than primordium cells. As the series is traversed from the upper younger to the lower older units respiration per unit protein tends to increase in the primordia. In the internodes it is highest in the first three, decreases abruptly from the third to the fourth, and then increases again. Frequently the values for the dome are intermediate between those for the first internode and those for the first primordium. The significance of these differences is discussed.