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Fluctuations in nitrate reductase activity, and organic nitrogen concentrations of succulent plants under different nitrogen and water regimes

Title data

Widmann, K. ; Gebauer, Gerhard ; Rehder, H. ; Ziegler, H.:
Fluctuations in nitrate reductase activity, and organic nitrogen concentrations of succulent plants under different nitrogen and water regimes.
In: Oecologia. Vol. 94 (May 1993) Issue 1 . - pp. 146-152.
ISSN 1432-1939
DOI: https://doi.org/10.1007/BF00317316

Abstract in another language

The CAM (Crassulacean acid metabolism) succulent species Kalanchoe daigremontiana, K. tuhiflora and Crassula argentea, and the succulent C3 species Peperomia obtusifolia, were cultivated in pure culture in open-air conditions under two different regimes of nitrogen and water supply. At specified intervals during the course of vegetative growth, biomass, nitrate reductase activity (NRA), nitrate concentration, and organic nitrogen concentration of whole plants were measured. After 100 days of cultivation the leaf conductance of Crassula and Peperomia was measured at intervals for the duration of a day. Behaviour of all four species was strongly influenced by the cultivation regime. This was apparent in terms of productivity and variable fluctuations in NRA, nitrate concentration, and organic nitrogen concentration during the vegetative period. Increase in biomass was mostly connected with a decrease in all other investigated parameters, especially under conditions of water and/or nitrogen deficiency. The typical reaction of the CAM species Crassula to limited nitrogen but adequate soil water was to reduce leaf conductance during light, whereas the C3 plant Peperomia increased conductance in comparison with plants having a nitrogen suppy. The NRA of all plant species was reduced by both soil nitrate deficiency and drought. The succulent plant species, which are specially adapted to drought, neither took up nor used nitrate when water was limited. This was particularly the case for the CAM species, but less so for the C3 Peperomia, which showed very high concentrations of nitrate and organic nitrogen, but low NRA and biomass gain. A formula was derived to express the nitrogen use efficiency (NUE) of the species, i.e. the ability of a plant to use nitrogen over a specific period of growth. NUE was shown to increase with age for the crassulacean species but to decrease for the C3 Peperomia. Furthermore, NUE varied with the different nutrient levels in a species-specific manner, with high values for NUE not necessarily coupled to high productivity, and with NUE of the C3 species generally higher than that of CAM species.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER7125
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology > Chair Plant Ecology
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 12 Nov 2015 07:44
Last Modified: 12 Nov 2015 07:44
URI: https://eref.uni-bayreuth.de/id/eprint/22449