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STUDIES IN THE PHYSIOLOGY OF THE VIRUS DISEASES OF THE POTATO
Author(s) -
BARTONWRIGHT EUSTACE,
ALAN M.
Publication year - 1933
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.1933.tb07446.x
Subject(s) - biology , nitrogen , asparagine , amino acid , victory , botany , horticulture , agronomy , biochemistry , chemistry , politics , law , organic chemistry , political science
SUMMARY. The present investigation is concerned with the differences between the nitrogen metabolism of healthy and leaf‐roll affected potato plants. Diurnal estimations were made of the total nitrogen as well as the following nitrogen fractions, ammonia N, asparagine N, amino‐acid N, nitrate N, residual N and protein N in the leaves and petioles of healthy and leaf‐roll infected Arran Victory and President. Weekly determinations of total nitrogen and the above nitrogen fractions were also made in the laminae of Arran Victory and President throughout the growing season. Evidence is presented to show that there is apparently no fundamental difference in the nitrogen metabolism of healthy and leaf‐roll plants, and that the formation of nitrogenous compounds proceeds along the same lines in the two cases. A theory is put forward to account for protein synthesis direct from nitrate N, and not via amino‐acids. The problem of translocation is also discussed, and it is considered that the residual N fraction plays an important part in nitrogen transport. We wish to express our indebtedness to Mr William Robb. F.E.S.E., for reading the manuscript and making a number of suggestions. We would also like to take this opportunity of thanking Dr W. H. Pearsall, of the Botany Department, The University, Leeds, for his help and assistance in a number of different directions. This work was carried out at the Station of the Scottish Society for Research in Plant Breeding, Corstorphine, Edinburgh, under a scheme supported by a grant from the Empire Marketing Board.