Atributos morfológicos y fisiológicos de genotipos de Brachiaria en un suelo con bajo fósforo disponible y alta saturación de aluminio = Morphologic and physiological attributes of Brachiaria genotypes in soil with low available phosphorus and high aluminum saturation
Se evaluaron en invernadero en un suelo de Matazul, Meta, Colombia durante 6 semanas, 2 genotipos de Brachiaria (uno mejor adaptado a bajo P, B. decumbens y otro menos adaptado, B. ruziziensis) y 8 progenies del cruzamiento entre ellos ( mejores adaptados: H-7, H-40, H-28, H-58; menos adaptados: H-190, H-94, H-82, H-179). Los genotipos mejor adaptados presentaron mayor biomasa aérea, explicada por mayor área foliar, mayor absorción de P en el tallo y mayor volumen de raíz. Las características morfológicas de las raíces, principalmente longitud, peso seco y contenido de P, permiteron mejor adaptación a bajo P disponible en el suelo. El periodo de evaluación fue suficiente para observar diferencias entre progenies. = Two Brachiaria genotypes (Brachiaria decumbens, considered as better adapted and Brachiaria ruziziensis, considered as less adapted) and 8 progenies from the cross of these two (H-7, H-40, H-28 and H-58 more adapted; H-190, H-94, H-82 and H-179 less adapted) were evaluated during 6 weeks to detect differences in shoot and root attributes when grown in an acid soil from Matazul, Meta, Colombia. Results indicated that better adapted genotypes to low P had more shoot biomass, this could be explained by a greater leaf area, more P uptake in the stem and greater root volume. The root attributes, root length, root dry weight and root P content contributed to greater adaptation to low P availability in acid soils. Six weeks of plant growth was not adequate time to distinguish differences in adaptation to low P among the two parents, but it was adequate time to identify superior progenies from the crosses.
| Main Authors: | , , , , , |
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| Format: | Journal Article biblioteca |
| Language: | Spanish / Castilian |
| Published: |
2009
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| Subjects: | feed crops, brachiaria decumbens, brachiaria ruziziensis, genotypes, biomass, plant morphology, mineral nutrients, phosphorus, adaptability, genotipos, biomasa, morfología vegetal, nutrientes minerales, fosforo, adaptabilidad, |
| Online Access: | https://hdl.handle.net/10568/43088 http://www.scielo.org.co/pdf/acag/v58n1/v58n1a01.pdf |
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