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Titolo:
APPARENT CO2 ASSIMILATION, C-14 INCORPORATION, AND C-14 TRANSLOCATIONIN SPRING BARLEY INFLUENCED BY SINK MANIPULATIONS
Autore:
MERBACH W; SCHUMANN F; ROMER W; REINING E;
Indirizzi:
ZENTRUM AGRARLANDSCHAFTS & LANDNUTZUNGSFORSCH,INST OKOPHYSIOL PRIMARPROD,EBERSWALDER STR 84 D-15374 MUNCHEBERG GERMANY UNIV GOTTINGEN,INST AGR CHEM D-37075 GOTTINGEN GERMANY
Titolo Testata:
Photosynthetica
fascicolo: 4, volume: 30, anno: 1994,
pagine: 593 - 601
SICI:
0300-3604(1994)30:4<593:ACACIA>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
WHEAT; PHOTOSYNTHESIS; PLANTS; GRAINS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
26
Recensione:
Indirizzi per estratti:
Citazione:
W. Merbach et al., "APPARENT CO2 ASSIMILATION, C-14 INCORPORATION, AND C-14 TRANSLOCATIONIN SPRING BARLEY INFLUENCED BY SINK MANIPULATIONS", Photosynthetica, 30(4), 1994, pp. 593-601

Abstract

Pot experiments were conducted with Hordeum distichon L. (mutant of the cultivar Plena) and Hordeum vulgare L. ssp. hexastichon (cv. Certina). At two stages of development (5 and 20 d after the end of flowering), the assimilate demand of the sink organs (ears) was increased by darkening them for 5 d. The influence of this treatment on the apparentCO2 assimilation (P-N), the (CO2)-C-14 incorporation of source leaves(flag leaves) and the subsequent C-14 distribution in the plants wereinvestigated using a combination of gas exchange measurements by IRGAand exposure of the plants to (CO2)-C-14. Darkening of the ear 5 d after the end of flowering produced no change in P-N, C-14 incorporationof the source (flag leaf), or subsequent C-14 distribution to the individual organ fractions in either of the cultivars. Darkening of the ear of cv. Certina 20 d after the end of flowering caused an increased orientation of the C-14 translocation to the ear, while P-N of the flag leaf was not significantly influenced. In the Plena cultivar, the loss of ear photosynthesis caused by the darkening could not be compensated by the increased C-14 translocation, which was already very high in the control plants; P-N of the flag leaf was enhanced. In the courseof grain filling (5 d --> 20 d after the end of flowering), the absolute P-N, and protein and chlorophyll contents of the flag leaves strongly decreased in both cultivars. Darkening pf the ear delayed this process in cv. Plena and partly also in cv. Certina. In the case of an increased assimilate demand of the sink (ear), the CO2 assimilation of the source leaves was reduced only if the saccharide reserves of the plant were depleted. Differences in source-sink interactions observed between cultivars and developmental stages could be explained by this result.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/09/20 alle ore 19:24:01