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Abstract:

To study the effect of the maternal environment and N sources in responses to shading in Chenopodium album L., seeds from plants grown at an ambient red/far red (R/FR) ratio (1.07) or a low R/FR ratio (0.39) were germinated in a greenhouse at ambient light. At 34 d after sowing (d.a.s.), they were exposed to either ambient R/FR (0.98) or low R/FR (0.21) progeny light treatments and fertilized with 2.7 mmol/L nitrogen supplied at 1:3 or 3:1 NO3-: NH4+ ratios. Two harvests were performed at 67 and 113 d.a.s. At each harvest, stem elongation traits and biomass of plant organs were recorded. In the first harvest, tissue N% and free NO3--N concentrations were analyzed. In the first harvest, plants from the low R/FR maternal treatment were heavier and taller than the maternal controls when grown at an ambient R/FR and with a high NO3- supply. At the second harvest this difference persisted in most of the conditions tested. Stem elongation and relative biomass allocation to the stem increased in the low R/FR treated plants, although the effect varied during ontogeny and with the maternal and nutrient treatment considered. The studied factors also affected N acquisition and metabolism. It is concluded that responses to the light spectral quality as well as plant N economy are influenced by the R/FR ratio of the maternal environment and that their expression may be altered by the relative availability of NO 3--N and NH4+-N.

Registro:

Documento: Artículo
Título:Responses to shading in Chenopodium album: The effect of the maternal environment and the N source supplied
Autor:Causin, H.F.
Filiación:Fac. de Ciencias Exactas Y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, 1428 Ciudad Autonoma de Buenos Aires, Argentina
Palabras clave:Ammonium; Chenopodium album; Light spectral quality; Maternal effects; Nitrate; Shade-avoidance responses; Biomass; Greenhouses; Harvesting; Plants (botany); Tissue; Ambient light; Chenopodium album L.; Red/far red (R/FR); Seed; light quality; maternal effect; nitrate; shading; Greenhouses; Harvesting; Plants; Seeds; Tissue; Chenopodium; Chenopodium album
Año:2004
Volumen:82
Número:9
Página de inicio:1371
Página de fin:1381
DOI: http://dx.doi.org/10.1139/B04-095
Título revista:Canadian Journal of Botany
Título revista abreviado:Can. J. Bot.
ISSN:00084026
CODEN:CJBOA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00084026_v82_n9_p1371_Causin

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Citas:

---------- APA ----------
(2004) . Responses to shading in Chenopodium album: The effect of the maternal environment and the N source supplied. Canadian Journal of Botany, 82(9), 1371-1381.
http://dx.doi.org/10.1139/B04-095
---------- CHICAGO ----------
Causin, H.F. "Responses to shading in Chenopodium album: The effect of the maternal environment and the N source supplied" . Canadian Journal of Botany 82, no. 9 (2004) : 1371-1381.
http://dx.doi.org/10.1139/B04-095
---------- MLA ----------
Causin, H.F. "Responses to shading in Chenopodium album: The effect of the maternal environment and the N source supplied" . Canadian Journal of Botany, vol. 82, no. 9, 2004, pp. 1371-1381.
http://dx.doi.org/10.1139/B04-095
---------- VANCOUVER ----------
Causin, H.F. Responses to shading in Chenopodium album: The effect of the maternal environment and the N source supplied. Can. J. Bot. 2004;82(9):1371-1381.
http://dx.doi.org/10.1139/B04-095