The application of 15N to investigating the influence of herbicides on crop and weed plants. Report 2. The action characteristics of herbicides on the nitrogenous metabolism of resistant and susceptible plants

Ladonin, V.F.; Chesalin, G.A.; Samoilov, L.N.; Spesivtsev, L.G.; Taova, V.I.

Agrokhimiya (9): 116-122

1980


ISSN/ISBN: 0002-1881
Accession: 001000458

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Abstract
2,4-D and dicamba decreased 15N uptake by pea plants (sensitive) by 55-64% after 6 days and reduced N incorporation into leaf proteins and increased N incorporation into non-protein N compounds. 2,4-D decreased the N content in all plant parts except nuclei and mitochondria and decreased it in chloroplasts which might explain their impaired performance under the influence of 2,4-D. The influence of atrazine on a resistant species (maize) was shown by a 35% increase in the protein content in nuclei at the expense of non-protein N, reflecting an increased level of biosynthesis. In peas, a sensitive species, atrazine increased the protein N content in all cell structures except mitochondria but there was little increase in the plant as a whole; the non-protein N content sharply increased in all fractions. Atrazine decreased 15N uptake in pea plants and reduced by one-third 15N incorporation into proteins. The increase in cell protein was due to the herbicide-induced decrease in protein decomposition rather than to increased protein synthesis. Lenacil sharply reduced N uptake in French bean plants (sensitive) and reduced 15N incorporation into proteins; most N went to the roots and least to the leaves. The sharp reduction in protein synthesis could be partly the consequence and partly the cause of N uptake inhibition.