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Titolo:
SITE, SCALE AND TIME-COURSE FOR ADJUSTMENTS IN LATERAL ROOT INITIATION IN WHEAT FOLLOWING CHANGES IN C AND N SUPPLY
Autore:
BINGHAM IJ; BLACKWOOD JM; STEVENSON EA;
Indirizzi:
SAC,DEPT CROP BIOL,581 KING ST ABERDEEN AB24 5UD SCOTLAND
Titolo Testata:
Annals of botany
fascicolo: 1, volume: 80, anno: 1997,
pagine: 97 - 106
SICI:
0305-7364(1997)80:1<97:SSATFA>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
ASYMMETRICAL TRANSVERSE DIVISIONS; ZEA-MAYS-L; PERICYCLE CELLS; SEEDLING ROOTS; NITRATE; GROWTH; PLANTS; NUTRIENTS; SYSTEM; BARLEY;
Keywords:
COMPENSATORY GROWTH; CORRELATIVE GROWTH; GLUCOSE; INITIATION; LATERAL ROOT; NITRATE; PRIMORDIUM; SPLIT-ROOT; TRITICUM AESTIVUM; WHEAT;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
29
Recensione:
Indirizzi per estratti:
Citazione:
I.J. Bingham et al., "SITE, SCALE AND TIME-COURSE FOR ADJUSTMENTS IN LATERAL ROOT INITIATION IN WHEAT FOLLOWING CHANGES IN C AND N SUPPLY", Annals of botany, 80(1), 1997, pp. 97-106

Abstract

The pattern of lateral root initiation in seminal roots of wheat (Triticum aestivum L. cv. Alexandria) and the location, scale and time-course for adjustments in initiation were studied after changes in C and N supply. Macroscopically visible primordia appeared in a non-acropetal sequence with the frequency (number per unit length) increasing withdistance behind the main root apex to a maximum at 40-50 mm behind the root tip. Pruning the root system to a single seminal axis increasedthe primordia frequency by 23% within 15 h. After longer periods, theeffect of root-pruning was greater. The enhanced primordia Frequency was first observed in tissue located 0-10 mm behind the apex at the start of treatment. Feeding glucose (50 mM) also increased primordia frequency within 15 h, but to a greater extent, and here additional primordia were initiated in tissue located 0-10 and 10-20 mm behind the apex at the start of treatment. Withdrawing NO3- from one part of a split-root system, whilst maintaining the supply to the other, reduced primordia frequency in the non-fed roots and, in some cases, a compensatory increase in the NO3--fed roots was observed. The location and scale of the adjustments were similar to those found with root-pruning and glucose-feeding, but were slightly slower to appear. In spite of some differences in detail, there was a broad similarity in site, scale and time-course for adjustments in lateral root initiation with these treatments, which is consistent with the operation of a common mechanism. Whenever an increase in primordia frequency was observed, it was associated with an increase in the ethanol-soluble sugar content of the tissue. However, the reduction in frequency in NO3--deprived roots was also accompanied by an increase in sugar content. There was no consistent relationship between total N content of the tissue and primordia frequency, but there was between primordia frequency and the rate of net NO3- uptake. The possible mechanisms controlling lateral root initiation are discussed. (C) 1997 Annals of Botany Company.

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Documento generato il 30/11/20 alle ore 15:06:17