| Autor: |
Waterer, John C., Vessey, J. Kevin, Raper Jr., C. David |
| Předmět: |
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| Zdroj: |
Physiologia Plantarum; Oct92, Vol. 86 Issue 2, p215-220, 6p |
| Abstrakt: |
Although the inhibitory effects of high concentrations of mineral N (> 1.0 mM) on nodule development and function have often been studied, the effects of low, static concentrations of NH4+ (Pisum sativum L. cv. Express (Svalöf AB)] for the initial 28 days after planting (DAP). Peas grown in the presence of low concentrations of NH4- had significantly greater nodule numbers (up to 4-fold) than plants grown without NH4+. Nodule dry weight per plant was significantly higher at 14. 21 and 28 DAP in plants grown in the presence of NH4+, hut individual nodule mass was lower than in plants grown without N4+. The nodulation pattern of the plants supplied with N4+ was similar to that often reported for supernodulating mutants, however the plants did not express other growth habits associated with supernodulation. Estimates of N2 fixation indicate that the plus-NH4- peas fixed as much or more N2 than the plants supplied with minus-NH4+ nutrient solution. There were no significant differences in nodule numbers. nodule mass or NH4+ uptake between the plants grown at the two concentrations of NH4+. Nodulation appeared to autoregulate by 14 DAP in the minus-NH4+ treatment. Plant growth and N accumulation in the minus-NH4+ plants lagged behind those of the plus-NH4+ treatments prior to N4 fixation becoming well established in the final week of the experiment. The plus-NH4+ treatments appeared not to elicit autoregulation and plants continued to initiate nodules throughout the experiment. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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