Journalartikel

Jahr der Veröffentlichung: 1978

Seiten: 407-416

Zeitschrift: Soil Science and Plant Nutrition

Bandnummer: 24

Heftnummer: 3

ISSN: 0038-0768

eISSN: 1747-0765

DOI Link: https://doi.org/10.1080/00380768.1978.10433119

Verlag: Taylor and Francis Group

Abstract: 
Uptake and assimilation of inorganic N in young rice [Oryza sativa] plants was studied with labelled N15. Depletion of the plants'' carbohydrate content, obtained by a preceding dark period, resulted in a drastic reduction of NH4+-N uptake. Plants exposed to low light intensity showed diminishing NH4+-N uptake rates as compared with plants exposed to full light intensity, the latter showing constant NH4+-N uptake rates during the whole experimental period. The percentage of labelled insoluble N in total labelled N was not significantly affected by a preceding dark period, whereas the low light intensity resulted in a lower proportion of insoluble N in roots and shoots. The incorporation of labelled N into the insoluble fraction (proteins, nucleic acids) was higher in plants fed with NH4+-N than in those fed with NO3-. The uptake of NH4+-N was not significantly affected by NO3-, whereas the NO3- uptake rate was considerably reduced in the presence of NH4+-N. Low energy status of plants affected the nitrate uptake more than the uptake of NH4+-N. Uptake and assimilation of inorganic N depend much on the energetic status of plants. Nitrate uptake and assimilation is more sensitive to low energy conditions than NH4+-N.

Harvard-Zitierstil: MENGEL, K. and VIRO, M. (1978) SIGNIFICANCE OF PLANT ENERGY STATUS FOR UPTAKE AND INCORPORATION OF NH4-NITROGEN BY YOUNG RICE PLANTS, Soil Science and Plant Nutrition, 24(3), pp. 407-416. https://doi.org/10.1080/00380768.1978.10433119

APA-Zitierstil: MENGEL, K., & VIRO, M. (1978). SIGNIFICANCE OF PLANT ENERGY STATUS FOR UPTAKE AND INCORPORATION OF NH4-NITROGEN BY YOUNG RICE PLANTS. Soil Science and Plant Nutrition. 24(3), 407-416. https://doi.org/10.1080/00380768.1978.10433119