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Titolo:
IMPORTANCE OF CYCLING AND RECYCLING OF MINERAL NUTRIENTS WITHIN PLANTS FOR GROWTH AND DEVELOPMENT
Autore:
MARSCHNER H; KIRKBY EA; ENGELS C;
Indirizzi:
UNIV LEEDS,DEPT BIOL LEEDS LS2 9JT W YORKSHIRE ENGLAND UNIV LEEDS,DEPT BIOL LEEDS LS2 9JT W YORKSHIRE ENGLAND UNIV HOHENHEIM,INST PFLANZENERNAHRUNG D-70593 STUTTGART GERMANY
Titolo Testata:
Botanica acta
fascicolo: 4, volume: 110, anno: 1997,
pagine: 265 - 273
SICI:
0932-8629(1997)110:4<265:IOCARO>2.0.ZU;2-F
Fonte:
ISI
Lingua:
ENG
Soggetto:
RICINUS-COMMUNIS L; LONG-DISTANCE TRANSPORT; TOMATO PLANTS; AMINO-ACIDS; PHLOEM SAP; XYLEM SAP; MAGNESIUM-DEFICIENT; TRITICUM-AESTIVUM; TOBACCO PLANTS; SOYBEAN PLANTS;
Keywords:
PHLOEM AND XYLEM TRANSPORT; PHOTOSYNTHATE ALLOCATION; SHOOT-ROOT RATIO; SHOOT SIGNALS;
Tipo documento:
Review
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
81
Recensione:
Indirizzi per estratti:
Citazione:
H. Marschner et al., "IMPORTANCE OF CYCLING AND RECYCLING OF MINERAL NUTRIENTS WITHIN PLANTS FOR GROWTH AND DEVELOPMENT", Botanica acta, 110(4), 1997, pp. 265-273

Abstract

Cycling of mineral nutrients, i.e. retranslocation in the phloem fromthe shoot to the roots, and recycling, i.e. translocation of cycled nutrients back in the xylem to the shoot can contribute substantially to the fluxes of phloem-mobile nutrients between roots and shoot. Cycling and recycling of nutrients serves several well defined functions. These include supplying the root with nutrients assimilated in the shoot (nitrate and sulphate reduction), maintenance of cation-anion balance, providing additional driving force for solute flow in the xylem andphloem, and acting as a shoot signal to convey nutrient demand to theroots. Cycling of mineral nutrients like K is also required to cover the demand for growth of apical root zones and to smooth out fluctuations that occur spatially and with time in the external nutient supply of soil-grown plants. Cycling and recycling of mineral nutrients is also closely related to the process of phloem loading and export of photosynthates from source leaves. This is particularly true for potassium, magnesium and phosphorus. Nutrient deficiency-induced shifts in dry matter partitioning between shoot and roots are therefore closely related to the solute flow in the phloem not only of photosynthates but also mineral nutrients from source leaves to roots. More research is needed, however, to elucidate in greater detail the contribution of cycling and recycling of mineral nutrients in the integration of growth processes at the whole plant level.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/11/20 alle ore 03:31:28