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Axillary bud viability and dry matter production of Poa ligularis in Patagonian grasslands: (with 1 table & 4 figures) Phyton
Souto,CP; Becker,GF; Siffredi,GL; Busso,CA; Sternberg,M.
Poa ligularis Nees is one of the dominant perennial grass species in Patagonian grasslands. This is the first field study which investigated the effects of defoliation frequency on its number of viable axillary buds, and subsequent dry matter production during one growing season. Experiments were arranged in a randomized complete block design. Treatments included one defoliation height (10 cm), from one to five times a year, and undefoliated controls. Bud respiratory activity was examined usingthe tetrazolium test and the vital stain Evan's blue. At the end of the growing season, plants that have been defoliated more than three times showed significatively (p<0.05) lower number of respiratory active buds than unclipped controls. A high defoliation...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Defoliation; Poa ligularis; Axillary buds; Semiarid Argentina; Dry matter production; Patagonia.
Ano: 2004 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572004000100004
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Defoliation frequency affects morphophysiological traits in the bunchgrass Poa ligularis Phyton
Gittins,C; Busso,CA; Becker,G; Ghermandi,L; Siffredi,G.
Poa ligularis is an important forage in Patagonian rangelands. Populations of this perennial bunchgrass have been severely affected by overgrazing. We propose that increased defoliation frequencies will decrease (1) aerial- and belowground dry matter production, (2) root survival, and (3) concentration and content of total non-structural crown + root carbohydrates, and (4) increase root mortality. Five defoliation frequencies (plus 1 control) were applied in a representative grassland of the Occidental District in Patagonia during two consecutive growing seasons. All four hypotheses were rejected. Aerial and belowground dry matter production increased from one to two or three defoliations. Root production and dynamics were not affected by the study...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Aerial dry weight; Defoliation frequency; Perennial grasses; Poa ligularis; Root dynamics; Total non-structural carbohydrates.
Ano: 2010 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572010000100009
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Effect of post-fire defoliation on growth of two native grasses in the Caldenal, Argentina Phyton
Peláez,DV; Bóo,RM; Mayor,MD; Elia,OR; Martínez,SA.
Plant growth in semiarid rangelands may be affected by time grazing is excluded during the post-fire regeneration period. The objective of this field work was to study the effect of post-fire defoliation at different phenological stages [vegetative (early-season defoliation) and internode elongation (late-season defoliation)] on growth of Piptochaetium napostaense and Poa ligularis, two very important perennial native grasses in the temperate semi-arid region of central Argentina (Caldenal). In general, the post-fire defoliation treatments did not affect the number of green leaves on tillers of P. napostaense. Early-season post-fire defoliation generally reduced the number of green leaves on tillers of P. ligularis in comparison to those in control plants....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Piptochaetium napostaense; Poa ligularis; Caldenal; Grass growth; Post-fire resting.
Ano: 2009 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572009000100004
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Reabsorción de nitrógeno en gramíneas perennes de diferente palatabilidad, nativas del Caldenal Ecología austral
Moretto,Alicia S; Didoné,Nilda G; Distel,Roberto A.
La reabsorción de nutrientes en las plantas permite su conservación y uso en la construcción de nuevos tejidos, por lo cual podría esperarse que fuera más acentuada en especies adaptadas a crecer con baja disponibilidad de nutrientes. En el Distrito del Caldén, las gramíneas de palatabilidad baja reúnen características distintivas de especies adaptadas a condiciones de poca fertilidad (e.g., tejido esclerenquimatoso abundante, baja concentración de nutrientes), características que en las gramíneas palatables son menos manifiestas. Por lo tanto, cabría esperar una mayor eficiencia y/o proficiencia de reabsorción y de utilización de nitrógeno (N) en Nassella tenuissima Trin. (palatabilidad baja) que en Poa ligularis Nees ex. Steud. (palatabilidad alta). El...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Eficiencia de reabsorción de nitrógeno; Proficiencia de reabsorción de nitrógeno; Eficiencia de utilización de nitrógeno; Poa ligularis; Nassella tenuissima.
Ano: 2013 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1667-782X2013000100001
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Variabilidad germinativa en semillas de diferentes poblaciones de cuatro especies de gramíneas nativas de Patagonia: Un estudio de caso en el noroeste de Chubut Boletín de la Sociedad
Nagahama,Nicolás; García Martínez,Guillermo C; Buduba,Carlos G; Opazo,Walter; Caruso,Cecilia A; Ciari,Georgina.
En este estudio se analizó la calidad y el comportamiento germinativo de semillas de diferentes poblaciones localizadas en un gradiente de precipitación anual oeste-este (500 a 150 mm) en cuatro especies de gramíneas forrajeras nativas (Bromus setifolius, Hordeum comosum, Festuca pallescens y Poa ligularis), del NO de Chubut. Se estimó el peso y el porcentaje de semillas llenas a nivel inter- e intra-específico. Las semillas fueron sembradas en un ambiente común y se calculó el porcentaje de germinación y la velocidad de emergencia para las especies y las poblaciones. En este trabajo se presentan datos relacionados a la germinación de semillas recolectadas en un año en particular (2015) de estas cuatro especies y se discuten principalmente los resultados...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Bromus setifolius; Ecotipos; Festuca pallescens; Germinación; Hordeum comosum; Poa ligularis.
Ano: 2016 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-23722016000100008
Registros recuperados: 5
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