𝔖 Bobbio Scriptorium
✦   LIBER   ✦

The influence of ammonium on nitrate reduction in wheat seedlings

✍ Scribed by P. L. Minotti; Doris Craig Williams; W. A. Jackson

Publisher
Springer-Verlag
Year
1969
Tongue
English
Weight
280 KB
Volume
86
Category
Article
ISSN
0032-0935

No coin nor oath required. For personal study only.

✦ Synopsis

Ammonium markedly inhibited nitrate absorption by nitrogenstarved wheat seedlings but did not decrease the proportion of absorbed nitrate that was reduced. Seedlings high in nitrate (absorbed prior to the experimental periods) reduced similar amounts of this nitrate regardless of whether or not ammonium was present and being absorbed during the period of measurement. Ammonium or products of ammonium assimilation did not interfere with the induction, stability, or activity of nitrate reductase. Consequently, the hypothesis that ammonium depresses nitrate uptake indirectly by inhibiting nitrate reduction is rejected, and it is suggested that the ammonium effect is directly on the nitrateuptake process.

πŸ“œ SIMILAR VOLUMES

The effect of endogenous and externally
The effect of endogenous and externally supplied nitrate on nitrate uptake and reduction in sugarbeet seedlings
✍ Gisela MΓ€ck; Rudolf Tischner πŸ“‚ Article πŸ“… 1990 πŸ› Springer-Verlag 🌐 English βš– 490 KB

The pericarp of the dormant sugarbeet fruit acts as a storage reservoir for nitrate, ammonium and Ξ±-amino-N. These N-reserves enable an autonomous development of the seedling for 8-10 d after imbibition. The nitrate content of the seed (1% of the whole fruit) probably induces nitrate-reductase activ

Effect of ammonium and nitrate on growth
Effect of ammonium and nitrate on growth and appearance of nitrate reductase and nitrite reductase in dark- and light-grown mustard seedlings
✍ V. K. Rajasekhar; H. Mohr πŸ“‚ Article πŸ“… 1986 πŸ› Springer-Verlag 🌐 English βš– 588 KB

Nitrate-induced and phytochrome-modulated appearance of nitrate reductase (NR; EC 1.6.6.1) and nitrite reductase (NIR; EC 1.7.7.1) in the cotyledons of the mustard (Sinapis alba L.) seedling is strongly affected by externally supplied ammonium (NH2). In short-term experiments between 60 and 78 h aft