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| Publication Type:
| Refereed |
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| Author(s): | Bowman, Daniel C.;
Paul, Jack L. |
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| Author Affiliation: | Dept. of Environmental Horticulture, University of California, Davis, CA. |
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| Title: | Uptake and Assimilation of NO3- and NH4+ by Nitrogen-Deficient Perennial Ryegrass Turf |
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| Source: | Plant Physiology. Vol. 88, No. 4, December 1988, p. 1303-1309. |
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| Publishing Information: | Lancaster, PA: American Society of Plant Physiologists |
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| Keywords: | TIC Keywords: Uptake; Assimilation; Nitrogen; Lolium perenne; Roots; Shoots; Deficiency
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| Abstract/Contents: | "Assimilation of NO3- and NH4+ by perennial ryegrass (Lolium perenne L.) turf, previously deprived of N for 7 days, was examined. Nitroen uptake rate was increased up to four- to five-fold for both the deficiency-N-deprivation as compared to N-sufficient controls, with the deficiency-enhanced N absorption persisting through a 48 hour uptake period. Nitrate, but not NH4+, accumulated in the roots and to a lesser degree in shoots. By 48 hours, 53% of the absorbed NO3- had been reduced, whereas 97% of the NH4+ had been assimilated. During the early stages (0 to 8 hours) of NO3- uptake by N-deficient turf, reduction occurred primarily in the roots. Between 8 and 16 hours, however, the site of reduction shifted to the shoots. Nitrogen form did not affect partitioning of the absorbed N between roots (40%) and shoots (60%) but did affect growth. Compared to NO3-, NH4+ uptake inhibited root, but not shoot, growth. Total soluble carbohydrates decreased in both roots and shoots during the uptake period, pricipally the result of fructan metabolism. Ammonium uptake resulted in greater total depletion of soluble carbohydrates in the root compared to NO3- uptake. The data indicate that N assimilation by ryegrass turf utilizes stored sugars but is also dependent on current photosynthate." |
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| Language: | English |
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| References: | 29 |
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| Note: | Tables
Graphs |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Bowman, D. C., and J. L. Paul. 1988. Uptake and Assimilation of NO3- and NH4+ by Nitrogen-Deficient Perennial Ryegrass Turf. Plant Physiol. 88(4):p. 1303-1309. |
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