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- W2062731533 abstract "Bromeliads exhibit several growth habits, ranging from terrestrial to epiphytic and associated shoot and root architectures. Accordingly, they are probably exposed to different sources of supply and forms of nitrogen (N), including mineral and organic. Nitrogen uptake and assimilation could reflect this. We compared the activities of nitrate reductase (NR) and glutamine synthetase (GS) as well as NO3 − contents in plantlets of two bromeliad species. Vriesea fosteriana, a C3saxicolous tank-forming type, and Tillandsia pohliana, an atmospheric CAM epiphyte, were grown in vitro with NO3 −, NH4 + or NH4NO3as the sole N sources (4 mM of N). Nitrate alone was a poor N source to support growth of both plant species but it was effective with NH4 +. Consistently, both bromeliads exhibited very low levels of NO3 − assimilation. The tank-forming species presented GS activity 2.5–3.0 fold higher than T. pohliana. The low GS activity found in T. pohliana compared to V. fosteriana may be related to distinct photosynthetic pathways and may also reflect an adaptation to survival in a nutrient-limited habitat." @default.
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- W2062731533 date "2001-09-30" @default.
- W2062731533 modified "2023-09-23" @default.
- W2062731533 title "LEVELS OF NITROGEN ASSIMILATION IN BROMELIADS WITH DIFFERENT GROWTH HABITS" @default.
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- W2062731533 doi "https://doi.org/10.1081/pln-100106989" @default.
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