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Titolo:
RELATIONSHIP BETWEEN TISSUE SUGAR CONTENT, PHLOEM IMPORT AND LATERAL ROOT INITIATION IN WHEAT
Autore:
BINGHAM IJ; BLACKWOOD JM; STEVENSON EA;
Indirizzi:
SAC,DEPT CROP HLTH,581 KING ST ABERDEEN AB24 5UD SCOTLAND
Titolo Testata:
Physiologia Plantarum
fascicolo: 1, volume: 103, anno: 1998,
pagine: 107 - 113
SICI:
0031-9317(1998)103:1<107:RBTSCP>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
SEEDLING ROOTS; GROWTH; EXPRESSION; NITRATE; BARLEY; PLANTS; TRANSLOCATION; RESPIRATION; EXTENSION; NUTRIENTS;
Keywords:
CARBON; GLUCOSE; INITIATION; LATERAL ROOT; PHLOEM TRANSLOCATION; SPLIT-ROOT; TRITICUM AESTIVUM; WHEAT;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
23
Recensione:
Indirizzi per estratti:
Citazione:
I.J. Bingham et al., "RELATIONSHIP BETWEEN TISSUE SUGAR CONTENT, PHLOEM IMPORT AND LATERAL ROOT INITIATION IN WHEAT", Physiologia Plantarum, 103(1), 1998, pp. 107-113

Abstract

Split-root experiments were conducted to test the hypothesis that adjustments in lateral root initiation, as might occur in response to localized soil conditions, are determined by the sugar content of the root and do not depend on changes in the import of phloem-translocated phytohormones. Wheal (Triticum aestivum L. cv. Alexandria) seedlings were grown in hydroponics with their seminal roots divided between two compartments within the culture vessel. Two seminal roots of treated plants were supplied with standard nutrient solution supplemented with 50mM glucose, whilst the remaining three roots received nutrient solution without glucose. Control plants had their roots divided in the sameratio, but both 'halves' received nutrient solution without glucose. Feeding glucose to one 'half' of the root system increased the frequency (number per unit length) of lateral root primordia in the fed axes. The increase was first observed 15 h after the start of treatment andwas located within the apical 30 mm of root. At this time there was no significant treatment effect on the frequency of primordia in non-fed axes. The enhanced initiation of lateral roots in glucose-fed root tips was associated with an increase in their concentration of glucose and sucrose plus low molecular mass fructans. In contrast, there was areduction in partitioning of C-14-photosynthate to these root tips compared to the non-fed roots of treated plants and controls. The results indicate that lateral root initiation can be stimulated by sugars inthe absence of an increase in phloem translocation. It is proposed that proliferation of lateral roots in response to localized soil conditions, such as nutrient patches, may be signalled by an increase in sugar content of the tissue, rather than an altered flux of phytohormonesor other material co-transported with sucrose in the phloem.

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Documento generato il 30/11/20 alle ore 15:24:37