Abstract
The root system of plants is subject to fast cycles of renewal and decay within the growing season. In water and/or nutrient stress conditions, this turnover may become strategic for plant survival and productivity, but knowledge about its mechanisms is still insufficient. In order to investigate the effects of nitrogen fertilization on growth and turnover of sugar beet roots, an experiment was carried out over two growing seasons in northern Italy with two levels of N supply (0, 100 kg ha−1). Biomass production and partitioning were followed during growth, and fibrous root dynamics were inspected by means of computer-aided procedures applied to minirhizotron images.
In conditions of N shortage, lower yields (storage roots) were associated with greater allocation of biomass to tap roots (final tap-root/shoot ratio = 5.6 vs. 4.1) and shallower distribution of fibrous root length density. The maximum depth of roots was not affected by N, but unfertilized plants reached it more slowly.
The ratio of cumulative root dead length to produced length at the end of the growing period (TDL max/TPL max) was used as the most suitable approach for assessing overall root turnover. This ratio was greater in controls (0.73 vs. 0.50), which showed lower root longevity (−34% life-span on average), indicating that a greater proportion of root growth was renewed by unfertilized plants over the season.
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References
Aber J D, Melillo J M, Nadelhoffer K J, McClaugherty C A and Pastor J 1985 Fine root turnover in forest ecosystems in relation to quantity and form of nitrogen availability: a comparison of two methods. Oecologia 66, 317-321.
Bland W L 1993 Cotton and soybean root system growth in 3 soil temperature regimes. Agron. J. 85, 906-911.
Bona S, Mosca G, Vamerali T, Amaducci M T, Venturi G and Pritoni G 1995 Agronomic response of sunflowers to reduced inputs. Sementi Elette 41, 7-13.
Brown K F and Biscoe P V 1985 Fibrous root growth and water use of sugar beet. J. Agr. Sci. 105, 679-691.
Burton A J, Pregitzer K S and Hendrick R L 2000 Relationships between fine root dynamics and nitrogen availability in Michigan northern hardwood forests. Oecologia 125, 389-399.
Cheng W, Coleman D C and Box J E Jr. 1991 Measuring root turnover using the minirhizotron technique. Agr. Ecosyst. Environ. 34, 261-267.
Ciompi S, Gentili E, Guidi L and Soldatini G F 1996 The effect of nitrogen deficiency on leaf gas exchange and chlorophyll fluorescence parameters in sunflower. Plant Sci. Limerick 118, 177-184.
Clarkson D T, Sanderson J and Russel R S 1978 Ion uptake and root age. Nature 220, 805-806.
Davies F T Jr, Duray S A, Phavaphut Anon L and Stahl R S 1999 Influence of phosphorus on gas exchange and plant growth of two morphologically distinct types of Capsicum annuum. Photosynthetica 36,99-106.
Hendrick R L and Pregitzer K S 1992 The demography of fine roots in a northern hardwood forest. Ecology 73, 1094-1104.
Huang B R 1999 Water relations and root activities of Buchloe dactyloides and Zoysia japonica in response to localized soil drying. Plant Soil 208, 179-186.
Hutmacher R B, Keeley M P, Davis K R, Ayars J E, Peters M S, Dugger P and Richter D 1999 Cotton root systems in a clay loam soil: effects of growth stage, irrigation and nitrogen treatment. In Proceedings Beltwide Cotton Conferences, Orlando, Florida, USA, 3-7 January. pp. 637-640. National Cotton Council, Memphis.
Jaggard K W, Dunham R J, Brown K F and Werker A R 1996 Season and soil type effects on sugar beet root development. In Proceedings of 59th IIRB Congress, 13-15 February 1996. pp. 213-228.
Johnson M G, Tingey D T, Phillips D L and Storm M J 2001 Advancing fine root research with minirhizotrons. Environ. Exp. Bot. 45, 263-289.
Joslin J D, Wolfe M H, Hanson P J, Norby R, Fitter A and Jackson R 2000 Effects of altered water regimes on forest root systems. New Phytol. 147, 117-129.
King J S, Pregitzer K S, Zak D R and Stokes A 1999 Clonal variation in above-and below-ground growth responses of Populus tremuloides Michaux: influence of soil warming and nutrient availability. Plant Soil 217, 119-130.
Majdi H, Damm E and Nylund J E 2001 Longevity of mycorrhizal roots depends on branching order and nutrient availability. New Phytol. 150, 195-202.
Majdi H, Smucker A J M and Persson H 1992 A comparison between minirhizotron and monolith sampling methods for measuring root growth of maize (Zea mays L.). Plant Soil 147, 127-134.
Manschadi A M, Sauerborn J, Stutzel H, Gobel W and Saxena M C 1998 Simulation of faba bean (Vicia faba L.) root system development under Mediterranean conditions. Eur. J. Agron. 9, 259-272.
Merckx R, den Hartog A and van Veen J A 1985 Turnover of rootderived material and related microbial biomass formation in soils of different texture. Soil Biol. Biochem. 4, 565-569.
Paponov I A, Lebedinskai S and Koshkin E I 1999 Growth analysis of solution culture-grown winter rye, wheat and triticale at different relative rates of nitrogen supply. Ann. Bot. London 84, 467-473.
Passioura J B 1991 Soil structure and plant growth. Aust. J. Soil Res. 29, 717-728.
Rather K, Schenk M K, Everaarts A P and Vethman S 2000 Rooting pattern and nitrogen uptake of three cauliflower (Brassica oleracea var. botrytis) F1-hybrids. J. Plant Nutr. Soil Sc. 163, 467-474.
Ribaut J M and Pilet P E 1991 Effect of water stress on growth, osmotic potential and abscisic acid content of maize roots. Physiol. Plant. 81, 156-162.
Sainju U M, Singh B P, Reddy V R and Rahman S 2000 Tomato root growth is influenced by tillage, cover cropping, and nitrogen fertilization. Hortscience 35, 78-82.
Samson B K and Sinclair T R 1994 Soil core and minirhizotron comparison for the determination of root length density. Plant Soil 161, 225-232.
Sanderson J 1983 Water uptake by different regions of the barley root. Pathways of radial flow in relation to development of the endodermis. J. Exp. Bot. 34, 240-253.
Smit A L, Sprangers J F C M, Sablik P W and Groenwold J 1994 Automated measurement of root length with a three-dimensional high-resolution scanner and image analysis. Plant Soil 158, 145-149.
Smit A L, George E and Groenwold J 2000 Root observations and measurements at (transparent) interfaces with soil. In Root Methods. A Handbook. Eds. A L Smit, A G Bengough, C Engels, M van Nordwijk, S Pellerin and S C van de Geijn. pp. 235-271. Springer-Verlag, Berlin Heidelberg.
Smit A L and Zuin A 1996 Root growth dynamics of Brussels sprouts (Brassica oleracea var. gemmifera) and leeks (Allium porrum L.) as reflected by root length, root colour and UV fluorescence. Plant Soil 185, 271-280.
Swinnen J 1994 Rhizodeposition and turnover of root-derived organic material in barley and wheat under conventional and integrated management. Agr. Ecosyst. Environ. 51, 115-128.
Thomas T H 1996 Form and function of the sugar beet fibrous root system; its importance to crop productivity. In Proceedings of the 59th IIRB Congress, February 1996. pp. 143-152. Institut International de Recherches Betteravières, Brussels.
Vamerali T, Bona S and Mosca G 1994 Root length density, yield and nitrogen allocation in maize selected for low input. In Proceedings of the Third Congress of the European Society for Agronomy. Eds. M Borin and M Sattin. pp. 548-549. Padova University, Abano-Padova, Italy, 18-22 September 1994. European Society for Agronomy, Colmar.
Vamerali T, Ganis A, Bona S and Mosca G 1999 An approach to minirhizotron root image analysis. Plant Soil 217, 183-193.
Van Noordwijk M, Brouwer G, Koning H, Meijboom F W and Grzebisz W 1994 Production and decay of structural root material of winter wheat and sugar beet in conventional and integrated cropping systems. Agr. Ecosyst. Environ. 51, 99-113.
Veen B W, vanNoordwijk M, de Willigen P, Boone F R and Kooistra M J 1992 Root-soil contact of maize, as measured by a thinsection technique. III. Effects on shoot growth, nitrate and water uptake efficiency. Plant Soil 139, 131-138.
Zhang J, Gowing D J and Davies W J 1990 ABA as a root signal in root to shoot communication of soil drying. BSPGR Monograph 21, 163-173.
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Vamerali, T., Ganis, A., Bona, S. et al. Fibrous root turnover and growth in sugar beet (Beta vulgaris var. saccharifera) as affected by nitrogen shortage. Plant and Soil 255, 169–177 (2003). https://doi.org/10.1023/A:1026187017605
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DOI: https://doi.org/10.1023/A:1026187017605