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Title

Differential adaptability of one population of Dactylis glomerata subsp. marina and the hybrid between "marina x glomerata"

Other TitlesAdaptabilidad diferencial de una población de Dactylis glomerata subsp. marina y el híbrido entre "marina x glomerata"
AuthorsGarcía de Izaguirre, Álvaro ; Lindner Selbmann, Ruth ; Lema Márquez, Margarita
KeywordsClon
Cocksfoot
Environment
Hybrids
Dactilo
Ambiente
Híbridos
Issue Date2002
PublisherUniversidad Politécnica de Madrid
CitationRevista Pastos 32 (1): 49-58 (2002)
Abstract[EN] One natural population of cocksfoot (Dactylix glomerata) of subsp. marina (Mm504) and the natural hybrid between subsp. marina and subsp. glomerata (Mm794), were clonally replicated as spaced plants in two environments in the same locality, to detect differential genetic responses to the soil environment. Environment 1 had a less acid soil with more nutrients, less sand and less drought than environment 2. Morphological and agronomic traits were recorded, and most of them showed significant differences between populations, between environments and between plants (within populations). Mm794 had more erect plants and higher reproductive output than Mm504, but less biomass production in general. Environment 2 Was stressful for several characters (e.g. there was no winter growth and some plants of Mm504 did not flower in both years, 1998 and 1999), but there was significant genotype x environment interaction in many traits. Leaf biomass at the reproductive stage ( which presented crossover interaction) and growth habit were the traits with highest phenotypic plasticity, but each population showed plasticity for different traits. The effect of the environment on the differences between populations depended on the trait considered. Seed production was positively correlated with flag leaf length (r=0.63***).
[ES] Una poblacion natural de Dactylis glomerata subsp. marina (Mm504) y el hfbrido natural entre ésta subespecie y la subespecie glomerata (Mm794), se multiplicaron vegetativamente y se plantaron en dos ambientes diferentes dentro de la misma localidad, para detectar respuestas diferenciales genéticas en aspectos ambientales de distinto suelo. El ambiente 1 era un suelo menos acido y con mayor cantidad de nutrientes, menos arenoso que el suelo del ambiente 2. Se evaluaron caracteres mori‘ologicos y agronémicos, y la mayor parte de ellos mostraron diferencias significativas entre poblaciones, entre ambientes y entre plantas (dentro de poblaciones). Mm794 fue una poblacién mas erecta y mas productiva que Mm504, pero en general con menos biomasa. E1 ambiente 2 fue mas extremo para varios caracteres (p. ej. no se percibié crecimiento invernal y cinco plantas de la poblacion Mm504 no florecieron en 1998 ni en 1999). pero hubo una interaccion signifieativa genotipo x ambiente en muchos caracteres. La biomasa en estadio reproductivo y el habito de crecimiento fueron los caracteres con mayor plasticidad fenotfpica, pero cada poblacion mostro plasticidad para distintos caracteres. E1 efecto ambiental sobre las diferencias entre las poblaciones dependio del caracter en consideracién. La produccion de semilla estuvo correlacionada positivamente con la longitud de la hoja bandera (r=0,63***).
Description10 páginas y 4 tablas.
Publisher version (URL)http://polired.upm.es/index.php/pastos
URIhttp://hdl.handle.net/10261/162003
ISSN0210-1270
Appears in Collections:(MBG) Artículos
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