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- W2592231331 abstract "Nitrate reductase activity (NRA) in turfgrass roots should play an important role in the N metabolism of the whole plant because a major part of the shoots is removed by mowing. However, preliminary experiments demonstrated a lack of in vivo NRA in roots of Kentucky bluegrass grown in Hoagland's nutrient solutions, which were constantly aerated. We hypothesized that O 2 inhibited NRA by oxidizing carbohydrate available for NO 3 – reduction in roots. To test this hypothesis, Kentucky bluegrass ( Poa pratensis L.), cultivar Merit, was grown in nutrient solutions containing 0.1 mM NO 3 – . Grass cultures were treated with +O 2 (solution aerated), –O 2 (not aerated), +Suc (sucrose added to solution, final concentration = 25 mM) or –Suc (not added) for 12 days. Plants were harvested at 5:00 pm, separated into shoots and roots, and analyzed for in vivo NRA. The results partly supported the above hypothesis because the –Suc–O 2 roots showed significantly higher NRA than –Suc+O 2 roots. However, +Suc roots did not exhibit greater NRA than –Suc roots, possibly because of a decreased pH in the solutions. Oxygen increased root growth and hence the growth of the whole plant, while sucrose decreased leaf N content and leaf NRA but did not improve growth." @default.
- W2592231331 created "2017-03-16" @default.
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- W2592231331 date "1998-06-01" @default.
- W2592231331 modified "2023-09-27" @default.
- W2592231331 title "Effects of Sucrose and Oxygen on Nitrate Reductase Activity and Growth of Kentucky Bluegrass" @default.
- W2592231331 doi "https://doi.org/10.21273/hortsci.33.3.480a" @default.
- W2592231331 hasPublicationYear "1998" @default.
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