Accumulation and Remobilization of Nitrogen in a Vegetative Winter Wheat Crop During or Following Nitrogen Deficiency

Vouillot, Marie Odile

doi:10.1006/anbo.1999.0861

Cited by 26 publications

(12 citation statements)

References 14 publications

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“…The roots acted as a sink for newly up taken N and as have been shown by other authors (Ourry et al, 1990;Vouillot and Devienne-Barret, 1999), there was a sink competition between roots and shoots. The roots maintained their capability to absorb N through the whole senescence period, in agreement with findings by Oscarson et al (1995b) and Oscarson (1996).…”

Section: Redistribution Of Nitrogenmentioning

confidence: 75%

Nitrogen redistribution from the roots in post-anthesis plants of spring wheat

2005

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The aim of this study was to investigate post-anthesis N redistribution from the roots to other organs in the wheat plant. Two cultivars of spring wheat (Triticum aestivum L.) Sport and WL were grown to maturity in culture solution with stepwise-decreasing N supply and 15 N before sampling. The N concentration of dry weight in the roots decreased from anthesis to full maturity. At maturity the root N concentration was 5.5 mg g −1 dry weight for Sport and 4.9 mg g −1 dry weight for WL, while the main shoot N concentration was 2.1 mg g −1 dry weight for Sport and 2.2 mg g −1 dry weight for WL. The roots were a major sink for N taken up post-anthesis and contained the main proportion of the 15 N during the whole post-anthesis period. The N redistributed from the roots contributed 24.3% of the total N amount in the grains at maturity in cv Sport and 8.7% in cv WL. For cv Sport, 46.3% of the root N amount was redistributed to other parts of the plant and for WL 25.4%. The tiller grains were supplied with N from the 15 N applied post-anthesis to a higher degree than the main shoot grains. The transport capability was maintained until 12 days after complete yellowness. We concluded that wheat has a great ability to redistribute nitrogen from the root system to the grains.

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Section: Redistribution Of Nitrogenmentioning

confidence: 75%

Nitrogen redistribution from the roots in post-anthesis plants of spring wheat

2005

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“…Foliage Chl and N are usually transformed from lower-to upper-layer leaves during shortages of nitrogen supply (Hikosaka et al 1994;Anten et al 1995;Vouillot and Devienne-Barret 1999). Vertical gradients of leaf Chl (Pearcy and Seemann 1990;Lemaire et al 1991) and leaf N are common features in canopies of crops (Shiraiwa and Sinclair 1993;Connor et al 1995).…”

Section: Introductionmentioning

confidence: 99%

Estimation of vertical distribution of chlorophyll concentration by bi-directional canopy reflectance spectra in winter wheat

et al. 2010

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An effective technique to measure foliage chlorophyll concentration (Chl) at a large scale and within a short time could be a powerful tool to determine fertilization amount for crop management. The objective of this study was to investigate the inversion of foliage Chl vertical-layer distribution by bi-directional reflectance difference function (BRDF) data, so as to provide a theoretical basis for monitoring the growth and development of winter wheat and for providing guidance on the application of fertilizer. Remote sensing could provide a powerful tool for large-area estimation of Chl. Because of the vertical distribution of leaves in a wheat stem, Chl vertical distribution characteristics show an obvious decreasing trend from the top of the canopy to the ground surface. The ratio of transformed chlorophyll absorption reflectance index (TCARI) to optimized soil adjusted Wenjiang Huang is an associate professor of application of quantitative remote sensing in agriculture. vegetation index (OSAVI) was called the canopy chlorophyll inversion index (CCII) in this study. The value of CCII at nadir, ±20 and ±30°, at nadir, ±30 and ±40°, and at nadir, ±50 and ±60°view angles were selected and assembled as bottom-layer Chl inversion index (BLCI), middle-layer Chl inversion index (MLCI), and upper-layer Chl inversion index (ULCI), respectively, for the inversion of Chl at the vertical bottom layer, middle layer, and upper layer. The root mean squared error (RMSE) between BLCI-, MLCI-, and ULCI-derived and laboratory-measured Chl were 0.7841, 0.9426, and 1.7398, respectively. The vertical foliage Chl inversion could be used to monitor the crop growth status and to guide fertilizer and irrigation management. The results suggested that vegetation indices derived from bi-directional reflectance spectra (e.g., BLCI, ULCI, and MLCI) were satisfactory for inversion of the Chl vertical distribution.

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“…First, reduction in number of remaining green leaves within 3 d after defoliation was smaller in H plants than in other two treatments. Mobilization of N from older leaves was observed in plants under N deficiency (Vouillot andDevienne-Barret 1999, Gloser 2005). Nitrogen from senescing leaves is then remobilized to support developing organs (Vouillot andDevienne-Barret 1999, Bausenwein et al 2001).…”

Section: Before Defoliationmentioning

confidence: 96%

“…Mobilization of N from older leaves was observed in plants under N deficiency (Vouillot andDevienne-Barret 1999, Gloser 2005). Nitrogen from senescing leaves is then remobilized to support developing organs (Vouillot andDevienne-Barret 1999, Bausenwein et al 2001). Role of green leaves as source of mobilizable N in spring regrowth of C. epigejos after overwintering has been proposed (Gloser 2005).…”

Section: Before Defoliationmentioning

confidence: 96%

See 1 more Smart Citation

Regrowth dynamics of Calamagrostis epigejos after defoliation as affected by nitrogen availability

Gloser¹,

Košvancová²,

Gloser³

2007

Biologia plant.

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Young plants of a rhizomatous grass Calamagrostis epigejos (L.) Roth were grown from seed in nutrient solutions containing nitrogen in concentrations 0.1, 1.0, and 10 mM. After six weeks of cultivation the plants were defoliated and changes in growth parameters and in content of storage compounds were measured in the course of regrowth under highly reduced nitrogen availability. Plants grown at higher nitrogen supply before defoliation had higher amount of all types of nitrogen storage compounds (nitrates, free amino acids, soluble proteins), which was beneficial for their regrowth rate, in spite of lower content of storage saccharides. Amino acids and soluble proteins from roots and stubble bases were the most important sources of storage compounds for regrowth of the shoot. Faster growth of plants with higher N content was mediated by greater leaf area expansion and greater number of leaves. In plants with lower contents of N compounds number of green leaves decreased after defoliation significantly and senescing leaves presumably served as N source for other growing organs. Results suggest that internal N reserves can support regrowth of plants after defoliation even under fluctuating external N availability. Faster regrowth of C. epigejos with more reserves was mediated mainly by changes in plant morphogenesis.

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Accumulation and Remobilization of Nitrogen in a Vegetative Winter Wheat Crop During or Following Nitrogen Deficiency

Cited by 26 publications

References 14 publications

Nitrogen redistribution from the roots in post-anthesis plants of spring wheat

Nitrogen redistribution from the roots in post-anthesis plants of spring wheat

Estimation of vertical distribution of chlorophyll concentration by bi-directional canopy reflectance spectra in winter wheat

Regrowth dynamics of Calamagrostis epigejos after defoliation as affected by nitrogen availability

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