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Titolo:
Characterization of the natural chemical and osmotic environment of early wheat embryogenesis
Autore:
Maes, O; Comeau, A; Nadeau, P; Simard, RR; St-Pierre, CA;
Indirizzi:
Agr & Agroalimentaire Canada, Ctr Rech, St Foy, PQ G1V 2J3, Canada Agr & Agroalimentaire Canada St Foy PQ Canada G1V 2J3 PQ G1V 2J3, Canada Univ Sherbrooke, Dept Biol, Sherbrooke, PQ J1K 2R1, Canada Univ Sherbrooke Sherbrooke PQ Canada J1K 2R1 erbrooke, PQ J1K 2R1, Canada Univ Laval, Dept Phytol, Quebec City, PQ G1K 7P4, Canada Univ Laval Quebec City PQ Canada G1K 7P4 Quebec City, PQ G1K 7P4, Canada
Titolo Testata:
PHYSIOLOGIA PLANTARUM
fascicolo: 2, volume: 107, anno: 1999,
pagine: 220 - 229
SICI:
0031-9317(199910)107:2<220:COTNCA>2.0.ZU;2-K
Fonte:
ISI
Lingua:
ENG
Soggetto:
AMINO-ACIDS; TRANSPORT PATHWAY; ENDOSPERM; SUGARS; CULTURE; GRAIN; ACCUMULATION; PROEMBRYOS; CONVERSION; EMBRYOS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
40
Recensione:
Indirizzi per estratti:
Indirizzo: Maes, O Agr & Agroalimentaire Canada, Ctr Rech, 2560 Hochelaga, St Foy, PQG1V 2J3, Canada Agr & Agroalimentaire Canada 2560 Hochelaga St Foy PQ Canada G1V 2J3
Citazione:
O. Maes et al., "Characterization of the natural chemical and osmotic environment of early wheat embryogenesis", PHYSL PLANT, 107(2), 1999, pp. 220-229

Abstract

Soluble carbohydrates, amino acids, and major inorganic ions were quantified and compared,vith the total osmolarity of the ovule, Most of the analyzed components increased rapidly in concentration, reaching a peak at 1 day post anthesis (DPA) and decreasing quickly 1 day later. Within this time period, the osmolarity decreased from 1.49 to 1.18 MPa, The osmolarity then increased to 1.39 MPa at 4 DPA, and yet the overall concentration of analyzedmolecules decreased, At 1 DPA, inorganic ions were observed at levels thatcould produce a high osmolarity (1.11 MPa), followed by the carbohydrates (0.37 MPa) and amino acids (0.07 MPa), Maltose was detected in ovules only from 0 to 2 DPA, Inositol was abundant in the ovules on the day of anthesis, but decreased to non-detectable levels after 4 DPA, This suggested that ovules allow the rapid entry of solutes into the syncytial endosperm after fertilization, but are osmotically buffered through the increase and decrease of partly identified substances. Specific gravity tests on the liquid squeezed from young endosperm supported this new hypothesis, Osmolarity in ovules seems only indirectly related to morphogenetic regulation mechanisms, and it may play a lesser role than the fluctuations of certain specific substances, The observed chemical changes offer insights into the rapidly varying nutritional needs of proembryos. Thus, this research yielded a useful complex amino acid formula, derived from knowledge of the natural environmentof the proembryo, and also an improved proembryo and ovule culture medium.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/11/20 alle ore 23:35:18