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Titolo:
CONTROL OF ROOT-GROWTH - EFFECTS OF CARBOHYDRATES ON THE EXTENSION, BRANCHING AND RATE OF RESPIRATION OF DIFFERENT FRACTIONS OF WHEAT ROOTS
Autore:
BINGHAM IJ; STEVENSON EA;
Indirizzi:
SAC ABERDEEN,DEPT CROP BIOL,581 KING ST ABERDEEN AB9 1UD SCOTLAND
Titolo Testata:
Physiologia Plantarum
fascicolo: 1, volume: 88, anno: 1993,
pagine: 149 - 158
SICI:
0031-9317(1993)88:1<149:COR-EO>2.0.ZU;2-K
Fonte:
ISI
Lingua:
ENG
Soggetto:
FUNCTIONAL EQUILIBRIUM; ZEA-MAYS; BARLEY; SHOOT; POTASSIUM; NITRATE; PHOSPHATE;
Keywords:
CARBOHYDRATE; EXTENSION RATE; GLUCOSE; LATERAL ROOT; RESPIRATION; ROOT; ROOT BRANCHING; ROOT PRIMORDIA; TRITICUM-AESTIVUM; WHEAT;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
26
Recensione:
Indirizzi per estratti:
Citazione:
I.J. Bingham e E.A. Stevenson, "CONTROL OF ROOT-GROWTH - EFFECTS OF CARBOHYDRATES ON THE EXTENSION, BRANCHING AND RATE OF RESPIRATION OF DIFFERENT FRACTIONS OF WHEAT ROOTS", Physiologia Plantarum, 88(1), 1993, pp. 149-158

Abstract

Rates of extension, numbers of laterals and rates of respiration weremeasured in different fractions of wheat (Triticum aestivum L. cv. Alexandria) roots following changes in carbohydrate supply. The supply of carbohydrate was varied by selective pruning and exogenously fed sugars. Pruning shoots to a single leaf (leaf-pruning) reduced the rate of O2 uptake by intact roots. Rates were not stimulated by short-term feeding of sucrose (25 mM), but were stimulated by the uncoupler p-trifluoromethoxy(carbonylcyanide)phenylhydrazone (FCCP). Feeding glucose to roots of leaf-pruned and non-pruned plants for 16-24 h increased therate of O2 uptake. It is concluded that respiration is under fine control by adenylates and coarse control by carbohydrate supply, with carbohydrates regulating directly the rate of some energy consuming process(es). These energy consuming processes are located in growing tissuefractions. Feeding glucose to leaf-pruned and non-pruned plants increased rates of O2 uptake in seminal root tips, the zone of developing lateral primordia and mature root sections with elongating laterals, but had no effect on mature sections from which the laterals had been excised. Leaf-pruning reduced the extension rate of seminal axes and first-order laterals when measured over 24 h. Feeding glucose to roots from the time of pruning increased the rate, but did not fully restore it to control values. Pruning roots to a single seminal axis (root-pruning) and feeding glucose to non-pruned plants had no effect on the extension rate of the seminal axis or its laterals over this time period,although rates were increased by root-pruning when measured over 3 days. The number of lateral root primordia was reduced by leaf-pruning and increased by root-pruning and feeding glucose. The results are discussed in terms of the role of carbohydrates in the control of root growth and branching.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/12/20 alle ore 08:11:43