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| Publication Type:
| Refereed |
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| Author(s): | Gastal, Francois;
Nelson, Curtis J. |
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| Author Affiliation: | Department of Agronomy, University of Missouri, Columbia, Missouri 65211 |
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| Title: | Nitrogen use within the growing leaf blade of tall fescue |
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| Source: | Plant Physiology. Vol. 105, No. 1, May 1994, p. 191-197. |
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| Publishing Information: | Rockville, MD: American Society of Plant Physiologists |
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| # of Pages: | 7 |
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| Keywords: | TIC Keywords: Vertical shoot growth; Nitrogen; Ethanol; Chloroplasts; Biosynthesis; Festuca arundinacea; Cell growth
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| Abstract/Contents: | "Leaf elongation rate (LER) of grasses depends on N supply and is expressed mostly through cell production, whereas most N in mature leaf tissues is chloroplastic. Our objective was to evaluate a possible competition for N between cell production and chloroplast development processes, utilizing the gradiant of cell development along the leaf growth zone of tall fescue (Festuca arundinacea Schreb.). Under the two contrasting N regimes, total N content was highest in the cell production zone, declined sharply as cells elongated, and remained relatively constant in more distal positions, at values close to those measured in mature tissues. A similar pattern was found for N in proteins and nucleic acids that were not soluble in 80% ethanol. Content of N compounds soluble in 80% ethanol was higher in the cell production and elongation zones than in mature parts of the leaf. NO₃-N content was low in the cell production zone and increased in the cell elongation zone for high-N plants. The deposition rate of total N in the growth zone was much higher with plants in high N than in those shifted to no N. For both N regimes, most N was deposited during cell production and early cell elongation. Little N was deposited during cell maturation where ribulose-1, 5-bisphosphate carboxylase/oxygenase (Rubisco) was being actively synthesized. This suggests that synthesis of Rubisco, and probably other chloroplastic proteins, occurs largely from recycling of N that was previously incorporated into proteins during cell production Thus, Rubisco content in mature tissues is more closely associated with N deposited during cell production than with N deposited during its biosynthesis." |
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| Language: | English |
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| References: | 30 |
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| Note: | Figures
Table |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Gastal, F., and C. J. Nelson. 1994. Nitrogen use within the growing leaf blade of tall fescue. Plant Physiol. 105(1):p. 191-197. |
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