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Association mapping of drought tolerance indices in wheat: QTL-rich regions on chromosome 4A Scientia Agricola
Ballesta,Paulina; Mora,Freddy; Del Pozo,Alejandro.
ABSTRACT Drought is likely the main abiotic stress that affects wheat yield. The identification of drought-tolerant genotypes represents an effective way of dealing with the continuous decrease in water resources as well as the increase in world population. The aim of this study was to identify single nucleotide polymorphisms (SNP) associated with drought tolerance indices in wheat by using a genome-wide association study (GWAS) under fully irrigated and rain-fed conditions. The drought tolerance indices (i.e., Stress Susceptibility Index, Stress Tolerance Index, Tolerance Index and Yield Stability Index) were calculated based on grain yield, 1,000-kernel weight and kernels per spike. The association panel was genotyped using genotyping-by-sequencing...
Tipo: Info:eu-repo/semantics/article Palavras-chave: SNP markers drought; Genome-wide association study; Rain-fed conditions.
Ano: 2020 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000201101
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EFECTO DE LA TEMPERATURA Y LA SUPLEMENTACIÓN ENERGÉTICA SOBRE LA PRODUCCIÓN DE LECHE EN VACAS LECHERAS A PASTOREO Agricultura Técnica
Jahn,Ernesto; Arredondo,Susana; Bonilla,Walter; Del Pozo,Alejandro.
Se realizó un ensayo con el objeto de determinar el efecto de la suplementación a la sombra durante los meses de verano para vacas que pastorean una pradera de trébol blanco - ballica perenne (Trifolium repens L. -Lolium multiflorum L.). Se compararon 4 tratamientos: I. Pastoreo día y noche sin suplementación; II. Pastoreo día y noche más suplementación; III. Pastoreo día y noche más suplementación a la sombra entre 11:30 y 17:00 h; y IV. Pastoreo día y noche más suplementación al sol entre 11:30 y 17:00 h. Se utilizaron 32 vacas Holstein con una producción promedio inicial de leche de 20,5 L d-1, las que fueron distribuidas en un diseño de bloques. Los resultados mostraron que no hubo un efecto significativo (P ³ 0,05) de los tratamientos sobre la...
Tipo: Journal article Palavras-chave: Producción láctea; Estrés de calor; Temperatura rectal.
Ano: 2002 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072002000200007
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Influence of Conservation Tillage and Soil Water Content on Crop Yield in Dryland Compacted Alfisol of Central Chile Chilean J. Agric. Res.
Martinez G,Ingrid; Ovalle,Carlos; Del Pozo,Alejandro; Uribe,Hamil; Valderrama V,Natalia; Prat,Christian; Sandoval,Marco; Fernández,Fernando; Zagal,Erick.
Chilean dryland areas of the Mediterranean climate region are characterized by highly degraded and compacted soils, which require the use of conservation tillage systems to mitigate water erosion as well as to improve soil water storage. An oat (Avena sativa L. cv. Supernova-INIA) - wheat (Triticum aestivum L. cv. Pandora-INIA) crop rotation was established under the following conservation systems: no tillage (Nt), Nt + contour plowing (Nt+Cp), Nt + barrier hedge (Nt+Bh), and Nt + subsoiling (Nt+Sb), compared to conventional tillage (Ct) to evaluate their influence on soil water content (SWC) in the profile (10 to 110 cm depth), the soil compaction and their interaction with the crop yield. Experimental plots were established in 2007 and lasted 3 yr till...
Tipo: Journal article Palavras-chave: Neutron probe; Penetrometer resistance; Oat; Subsoiling; Water erosion; Wheat.
Ano: 2011 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392011000400018
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