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| Web URL(s): | https://academic.oup.com/aob/article/89/1/11/194980/
Last checked: 03/01/2017
Requires: PDF Reader |
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| Publication Type:
| Refereed |
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| Author(s): | Macduff, J. H.;
Humphreys, M. O.;
Thomas, H. |
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| Author Affiliation: | Institute of Grassland and Environmental Research, Plas Gogerddan, Aberystwyth, UK |
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| Title: | Effects of a stay-green mutation on plant nitrogen relations in Lolium perenne during N starvation and after defoliation |
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| Section: | Original articles
Other records with the "Original articles" Section
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| Source: | Annals of Botany. Vol. 89, No. 1, January 2002, p. 11-21. |
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| Publishing Information: | London, Oxford University Press |
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| # of Pages: | 11 |
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| Keywords: | TIC Keywords: Mutations; Nitrogen; Lolium perenne; Defoliation; Ammonia; Nitrogen cycle; Senescence; Dry weight; Nutrient availability; Nutrient uptake
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| Abstract/Contents: | "The stay-green mutation of the nuclear gene sid results in inhibition of chlorophyll degradation during leaf senescence in grasses, reducing N remobilization from senescing leaves. Effects on growth of Lolium perenne L. were investigated during N starvation (over 18 d) and after severe defoliation, when leaf growth depends on the remobilization of internal N. Rates of dry matter production, partitioning between shoots and roots, and re-partitioning of N from shoots to roots were very similar in stay-green and normal plants under N starvation. Km and Vmax for net uptake of NH4+ were also similar for both genotypes, and Vmax increased with the duration of N deprivation. The mutation had little effect on recovery of leaf growth following severe defoliation, but stay-green plants recommenced NO3- and K+ uptake 1 d later than normal plants. Import of remobilized N into new leaves was generally similar in both lines. However, stay-green plants remobilized less N from stubble compared with normal plants. It was concluded that the sid locus stay-green mutation has no significant adverse effect on the growth of L. perenne during N starvation, or recovery from severe defoliation when plants are grown under an optimal regime of NO3- supply both before and after defoliation. The absence of any effect on leaf dry matter production implies that the difference in foliar N availability attributable to this mutation has little bearing on productivity, at least in the short to medium term." |
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| Language: | English |
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| References: | 52 |
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| Note: | Tables
Graphs |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Macduff, J. H., M. O. Humphreys, and H. Thomas. 2002. Effects of a stay-green mutation on plant nitrogen relations in Lolium perenne during N starvation and after defoliation. Ann. Bot. 89(1):p. 11-21. |
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| Web URL(s):
https://academic.oup.com/aob/article/89/1/11/194980/
Last checked: 03/01/2017
Requires: PDF Reader |
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MSU catalog number: QK 1 .A53 |
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