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Registros recuperados: 5
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Cuticle and cuticular wax development in the sunflower (Helianthus annuus L.) pericarp grown at the field under a moderate water deficit Phyton
Franchini1,MC; Hernández,LF; Lindström,LI.
Wax in the sunflower (Helianthus annuus L.) pericarp is an important morphological feature that interferes with oil quality and varies with crop management and environmental conditions. We studied the effect of a moderate water deficit (MWD) generated from early to late anthesis on quantitative development of the cuticle, and qualitative and quantitative development of the cuticular waxes (CW) of the pericarp in two hybrids grown under field conditions. The experiment was repeated during two consecutive seasons (Exp-I and Exp-II). At harvest maturity (HM), plants grown under a MWD showed higher CW content (31 to 47%) and thicker cuticles (13%) in both experiments compared to controls. Epicuticular wax (ECW) crystals showed a granular morphology. Also a...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cuticular waxes; Oil quality; Crop management; Hull; Anthesis; Harvest Maturity; Hybrid; Helianthus annuus L..
Ano: 2010 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572010000200007
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Is the abaxial palisade parenchyma in phyllaries of the sunflower (Helianthus annuus L.) capitulum a missing trait in modern genotypes? Phyton
Hernández,LF; Rosetti,MV.
The involucral bracts (IB or phyllaries) of the sunflower (Helianthus annuus L.) capitulum constitute an example of photosynthesizing organs that contribute to the photosynthesis budget during the generation of crop yield. The anatomy of IB was analyzed in two domesticated primitive sunfower genotypes, Havasupai and Hopi, in the sunflower line HA89B, in the wild Helianthus annuus ssp. annuus, in the sunflower male-fertile line R013 and in the commercial hybrid DKOP3845. Stomata and trichomes were counted on the adaxial and abaxial epidermis. In all cases, the IB showed a one-layered adaxial and abaxial epidermis, secretory ducts and parenchymatic cells with abundant chloroplast. The vascular system was similar to that of the nomophylls; however, their...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Inverted anatomy; Involucral bracts; Modern genotypes; Primitive genotypes; Sunflower.
Ano: 2016 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572016000200017
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La producción de polen en girasol (Helianthus annuus L.) es afectada por la temperatura y la humedad relativa del aire durante la fase reproductiva temprana Phyton
Astiz,V; Hernández,LF.
Durante la microsporogénesis las flores del girasol están frecuentemente expuestas a episodios de temperaturas diurnas y nocturnas superiores a 30/20 °C. Ello podría resultar en la reducción de la calidad y cantidad de polen producido y consecuentemente del rendimiento. En dos híbridos de girasol, durante 2 años, se estudió la relación entre la temperatura del aire en la fase meiótica de la microsporogénesis y la cantidad y calidad del polen producido. Los híbridos se sembraron en parcelas bajo riego en Bahía Blanca (38° 45' S; 62° 11' W) en tres fechas (FS) a una densidad de 5,6 plantas/m². La temperatura del aire fue registrada en forma horaria. Para el recuento de granos de polen por flor (GPF) y su viabilidad (VP) se tomaron fores consecutivamente con...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Fenología; Girasol; Humedad relativa del aire; Microsporogénesis; Temperatura del aire; Viabilidad y producción de polen.
Ano: 2013 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572013000200019
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Leaf angle and light interception in sunflower (Helianthus annuus L.). Role of the petiole's mechanical and anatomical properties Phyton
Hernández,LF.
The relationships between (1) leaf biomass and morphology (lamina area and petiole and lamina inclination), (2) petiole's mechanical and structural properties, and (3) the vertical light gradient inside the crop's canopy were studied in field grown sunflower (Helianthus annuus L.) plants, maintained at optimum soil water and mineral levels. At flowering, incident photosynthetic active radiation (PAR) was measured at the top of the canopy and on individual leaves using a quantum sensor. The fraction of direct incident radiation which passed through the canopy reaching each individual leaf was then calculated. Individual petiole and lamina inclination angles (iaPetiole and iaLamina, respectively) were measured from sequential digital images. These were taken...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Biomechanics; Helianthus; Leaf angle; Light interception; Sunflower.
Ano: 2010 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572010000200001
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Patrón de producción polínica en el capítulo del girasol cultivado (Helianthus annuus L.) Phyton
Astiz,V; Hernández,LF.
Se estudió cualitativamente y cuantitativamente la producción de polen intra-planta en el girasol cultivado (Helianthus annuus L.). Dos híbridos de girasol alto oleico se cultivaron durante dos temporadas consecutivas: 2009, en tres fechas de siembra, y 2010 en dos fechas de siembra. También se estudiaron dos variedades de girasol de polinización cruzada, Hopi y Havasupai, para determinar si un gradiente anómalo de polen intracapítulo, observado en estudios preliminares, podría ser un carácter remanente heredado de genotipos primitivos. Los granos de polen por flor (PGF), el volumen de la antera (AV) y del grano de polen (PGV) y la viabilidad del polen (PV) se analizaron en tres sectores del capítulo, externos (ES), medio (MS) e interno (IS). A la cosecha...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Helianthus annuus L; Produccion de polen; Rendimiento; Viabilidad del polen.
Ano: 2014 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572014000100004
Registros recuperados: 5
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