Vegetative and reproductive plasticity of broccoli at three levels of incident photosynthetically active radiation
To study the effects of shading on the growth, development, dry matter partitioning, and plant architecture of broccoli, "Legacy" hybrid plants were grown in pots in a greenhouse under black shading meshes to generate different levels of photosynthetically active radiation (PAR). The average inciden...
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| Format: | info:ar-repo/semantics/artículo |
| Language: | Inglés |
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2019
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| Online Access: | http://revistas.inia.es/index.php/sjar/article/view/258/255 http://hdl.handle.net/20.500.12123/6507 http://dx.doi.org/10.5424/sjar/2007053-258 |
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| author | Francescangeli, Nora Sangiacomo, Miguel Angel Marti, Hector Ruben |
| author_browse | Francescangeli, Nora Marti, Hector Ruben Sangiacomo, Miguel Angel |
| author_facet | Francescangeli, Nora Sangiacomo, Miguel Angel Marti, Hector Ruben |
| author_sort | Francescangeli, Nora |
| collection | INTA Digital |
| description | To study the effects of shading on the growth, development, dry matter partitioning, and plant architecture of broccoli, "Legacy" hybrid plants were grown in pots in a greenhouse under black shading meshes to generate different levels of photosynthetically active radiation (PAR). The average incident PAR was 23 mol PPF square m/d under control conditions, 15.2 under a 35% mesh, and 6.7 under a 70% mesh. The air temperature was within the range 15-22 deg C. As shading increased so did the duration of the growth cycle and the leaf area (LA). Shading did not affect the number of leaves, although the upper ones were more erect. The stem length and the accumulated intercepted PAR (IPAR) were negatively related. Inflorescence diameter and commercial fresh weight decreased only with the 70% mesh. Shading did not affect stem dry weight (DW) but altered dry matter allocation in the root and spear. The DW of the leaves maintained an average 45.7% of the total DW despite the greater LA developed under shade. The net assimilation rate diminished with the reduction of IPAR, and the LA increased; the plant relative growth rate was therefore practically constant. With increased shading, the leaves and the stem became the dominant photosynthate sinks. The commercial fresh weight achieved with 15.2 mol photosynthetic photon flux (PPF) square m/d was equivalent to that obtained with 23 mol PPF square m/d, but the cycle was extended for 4.5 days. With 6.7 mol PPF square m/d, yield diminished because of the lower DW produced in a cycle extended by 15 days, and because more dry matter was allocated to the stem than to the spear. Based on these results, broccoli could be considered a shade-tolerant plant. |
| format | info:ar-repo/semantics/artículo |
| id | INTA6507 |
| institution | Instituto Nacional de Tecnología Agropecuaria (INTA -Argentina) |
| language | Inglés |
| publishDate | 2019 |
| publishDateRange | 2019 |
| publishDateSort | 2019 |
| record_format | dspace |
| spelling | INTA65072020-01-10T12:56:28Z Vegetative and reproductive plasticity of broccoli at three levels of incident photosynthetically active radiation Francescangeli, Nora Sangiacomo, Miguel Angel Marti, Hector Ruben Brassica Oleracea Italica Bróculi Cultivo de Crucíferas Superficie Foliar Rendimiento de Cultivos Umbría Cultivo Protegido Contenido de Materia Seca Broccoli Cole Crops Leaf Area Crop Yield Shading Protected Cultivation Dry Matter Content To study the effects of shading on the growth, development, dry matter partitioning, and plant architecture of broccoli, "Legacy" hybrid plants were grown in pots in a greenhouse under black shading meshes to generate different levels of photosynthetically active radiation (PAR). The average incident PAR was 23 mol PPF square m/d under control conditions, 15.2 under a 35% mesh, and 6.7 under a 70% mesh. The air temperature was within the range 15-22 deg C. As shading increased so did the duration of the growth cycle and the leaf area (LA). Shading did not affect the number of leaves, although the upper ones were more erect. The stem length and the accumulated intercepted PAR (IPAR) were negatively related. Inflorescence diameter and commercial fresh weight decreased only with the 70% mesh. Shading did not affect stem dry weight (DW) but altered dry matter allocation in the root and spear. The DW of the leaves maintained an average 45.7% of the total DW despite the greater LA developed under shade. The net assimilation rate diminished with the reduction of IPAR, and the LA increased; the plant relative growth rate was therefore practically constant. With increased shading, the leaves and the stem became the dominant photosynthate sinks. The commercial fresh weight achieved with 15.2 mol photosynthetic photon flux (PPF) square m/d was equivalent to that obtained with 23 mol PPF square m/d, but the cycle was extended for 4.5 days. With 6.7 mol PPF square m/d, yield diminished because of the lower DW produced in a cycle extended by 15 days, and because more dry matter was allocated to the stem than to the spear. Based on these results, broccoli could be considered a shade-tolerant plant. Para determinar los efectos del sombreado sobre el crecimiento, el desarrollo, la partición de materia seca y la arquitectura de la planta de brócoli se cultivaron plantas del híbrido ‘Legacy’ en macetas, en un invernadero con mallas de sombreado para generar diferentes niveles de radiación fotosintéticamente activa (PAR). El promedio de PAR incidente fue 23 mol PPF m–2 día–1 (testigo), 15,2 (malla del 35%) y 6,7 (malla del 70%). Las temperaturas estuvieron dentro del rango 15-22°C. A mayor sombreado, aumentó la duración del ciclo y el área foliar (LA). El sombreado no afectó al número de hojas, pero las superiores adoptaron una posición más erecta. La longitud del tallo y la PAR interceptada acumulada (IPAR) se relacionaron negativamente. El diámetro de la inflorescencia y el peso fresco comercial sólo disminuyeron con la malla del 70%. El sombreado no afectó al peso seco (DW) del tallo, pero alteró la distribución de materia seca entre raíces y pella. Las hojas mantuvieron una proporción promedio del 45,7% del DW total, a pesar de la mayor LA desarrollada con el sombreado. Con la disminución de la IPAR, la tasa de asimilación neta disminuyó y la tasa de área foliar aumentó: este comportamiento compensatorio mantuvo la tasa de crecimiento relativo de toda la planta prácticamente constante. Con el incremento del sombreado, las hojas y el tallo fueron los destinos dominantes. Con 15,2 mol PPF m–2 día–1, el peso comercial fue equivalente al obtenido con 23 mol PPF m–2 día–1, pero el ciclo se extendió en 4,5 días. Con 6,7 mol PPF m–2 día–1, el rendimiento disminuyó debido al menor DW producido en un ciclo 15 días más largo, y a que la planta alojó más materia seca en el tallo que en la pella. Estos resultados indican que puede considerarse al brócoli como una planta tolerante al sombreado. EEA San Pedro Fil: Francescangeli, Nora. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria San Pedro; Argentina Fil: Sangiacomo, Miguel Ángel. Universidad Nacional de Luján. Departamento de Tecnología; Argentina Fil: Martí, Héctor Rubén. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria San Pedro; Argentina 2019-12-13T11:46:52Z 2019-12-13T11:46:52Z 2007 info:ar-repo/semantics/artículo info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://revistas.inia.es/index.php/sjar/article/view/258/255 http://hdl.handle.net/20.500.12123/6507 1695-971-X 2171-9292 (en línea) http://dx.doi.org/10.5424/sjar/2007053-258 eng info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) application/pdf Spanish Journal of Agricultural Research 5 (3) : 389-401 (2007) |
| spellingShingle | Brassica Oleracea Italica Bróculi Cultivo de Crucíferas Superficie Foliar Rendimiento de Cultivos Umbría Cultivo Protegido Contenido de Materia Seca Broccoli Cole Crops Leaf Area Crop Yield Shading Protected Cultivation Dry Matter Content Francescangeli, Nora Sangiacomo, Miguel Angel Marti, Hector Ruben Vegetative and reproductive plasticity of broccoli at three levels of incident photosynthetically active radiation |
| title | Vegetative and reproductive plasticity of broccoli at three levels of incident photosynthetically active radiation |
| title_full | Vegetative and reproductive plasticity of broccoli at three levels of incident photosynthetically active radiation |
| title_fullStr | Vegetative and reproductive plasticity of broccoli at three levels of incident photosynthetically active radiation |
| title_full_unstemmed | Vegetative and reproductive plasticity of broccoli at three levels of incident photosynthetically active radiation |
| title_short | Vegetative and reproductive plasticity of broccoli at three levels of incident photosynthetically active radiation |
| title_sort | vegetative and reproductive plasticity of broccoli at three levels of incident photosynthetically active radiation |
| topic | Brassica Oleracea Italica Bróculi Cultivo de Crucíferas Superficie Foliar Rendimiento de Cultivos Umbría Cultivo Protegido Contenido de Materia Seca Broccoli Cole Crops Leaf Area Crop Yield Shading Protected Cultivation Dry Matter Content |
| url | http://revistas.inia.es/index.php/sjar/article/view/258/255 http://hdl.handle.net/20.500.12123/6507 http://dx.doi.org/10.5424/sjar/2007053-258 |
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