M.M. Mujica's research while affiliated with Universidad Nacional de La Plata and other places

Publications (23)

Article
Full-text available
En Argentina, más específicamente en los pastizales del sur de la provincia fitogeográfica del Monte, Pappophorum vaginatum Buckley es prácticamente la única especie que provee forraje para los animales durante el verano. Debido a esto, se necesitan estudios orientados a lograr la mejora genética en esta especie que combine los efectos de la selecc...
Article
Full-text available
Arid zones, where native rangelands are common, are essentials for millions of people livelihood. These areas support 50% of the world's livestock and are where 44% of the world's food is grown. In rangelands of Central Argentina, Pappophorum vaginatum is basically the unique, warm-season perennial grass species palatable to grazing livestock. Our...
Article
Full-text available
Se evaluó variabilidad y correlación fenotípica en caracteres vinculados con el vigor de plántula en dos poblaciones de P. vaginatum. Se pesaron y sembraron individualmente 100 cariopses por población ("A"; "B"). A los 43 días se determinó: longitud aérea (LA), radical (LR), total (LT) y de raíz adventicia más larga (Ladv); número de raíces adventi...
Poster
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Se estudió la variabilidad y correlaciones de caracteres asociados al vigor de plántula en dos poblaciones de Pappophorum vaginatum, especie nativa de la región del Monte. Su palatabilidad la hace decreciente debido al sobrepastoreo. La reincorporación de la especie en su ambiente tiene el objetivo de aumentar la productividad, aumentar y mantener...
Poster
Full-text available
Se evaluó el comportamiento de la germinación de cuatro poblaciones diferentes de Pappophorum vaginatum, gramínea nativa de la región del Monte, bajo dos formas de almacenamiento de la semilla.
Article
Full-text available
Pappophorum vaginatum is the most abundant C4 perennial grass desirable to livestock in rangelands of northeastern Patagonia, Argentina. We hypothesized that (1) defoliation reduce net primary productivity, and root length density and weight in the native species, and (2) root net primary productivity, and root length density and weight, are greate...
Article
Successful establishment of Lotus tenuis, an important legume to improve grasslands in the Pampa Deprimida, might be limited by low seedling vigor. The number of crown stems is an important component of vigor. The objective of this work was to determine the variability in the number of crown stems on seedlings of 11 Lotus tenuis natural populations...
Article
Full-text available
It was evaluated variability and phenotypic correlation in traits related to seedling vigor in two natural populations of P.vaginatum. They were weighted and sowed individually 100 caryopses of each population ("A"; "B"). After 43 days it was determined: lenghts aerial (LA), root (LR), total (LT) and longest adventitious root (Ladv), number of adve...
Article
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This study focused on the two major processes critical for plant establishment: Seed germination and seedling survival. We determined the effects of (1) water stress and temperature on the germination, and (2) water stress on early seedling growth of Digitaria eriantha cv 'Irene'. Seeds harvested in 2007 were used for temperature studies, and those...
Article
Full-text available
The field performance of the native Pappophorum vaginatum, the naturalized Eragrostis curvula and various cultivars of the introduced Achnatherum hymenoides and Leymus cinereus was evaluated as potential forage resources in rangelands of arid Argentina during the warm seasons of 2007/2008 and 2008/2009. Plants of these grass species, obtained from...
Article
Full-text available
Baccharis ulicina is a weed widely distributed in pastures of the semiarid zone of Argentina. With the aim of evaluate potential allelopathic effects, aqueous extracts of B. ulicina (leaf, stem, root and whole plant) at two concentrations (50 and 150 g tissue/L water) were used on germination and initial growth of Avena sativa, Lolium perenne and R...
Article
Full-text available
Baccharis ulicina is a weed widely distributed in pastures of the semiarid zone of Argentina. With the aim of evaluate potential allelopathic effects, aqueous extracts of B. ulicina (leaf, stem, root and whole plant) at two concentrations (50 and 150 g tissue/L water) were used on germination and initial growth of Avena sativa, Lolium perenne and R...
Article
Pappophorum vaginatum is the most abundant C4, warm-season perennial grass in rangelands of northeastern, arid Patagonia, which is often exposed to continuous grazing. Eragrostis curvula is the only naturalized, C4 warm-season genotype that has successfully established from seed during moist years in the study region, that is characterized by a sca...
Article
The incorporation of Lotus tenuis would increase the productivity of grasslands in a sustainable way based on its persistence, for which natural reseeding of L. tenuis is important. The objective of this study was to evaluate the potential of natural reseeding in a pasture of L. tenuis cv. Aguapé in three sowing systems. The trial was implanted on...
Article
The incorporation of Lotus tenuis would increase the productivity of grasslands in a sustainable way based on its persistence, for which natural reseeding of L. tenuis is important. The objective of this study was to evaluate the potential of natural reseeding in a pasture of L. tenuis cv. Aguapé in three sowing systems. The trial was implanted on...
Poster
La variabilidad en la capacidad germinativa potencial importa para el mejoramiento genético de la implantación de Pappophorum subbulbosum, forrajera nativa de la región del Monte. La habilidad de germinar escalonadamente con temperatura baja sería estratégico para un ambiente semiárido.
Article
The intercrop of Lotus tennuis, a strategic legume to improve pasture, is constrained by the limited competitive ability of its seedlings. In this article we evaluated the influence of the environmental variations of water, light and nutrients on the characters involved in the implantation of populations of L. tennuis: air dry weight (PSA), number...
Article
Full-text available
The intercrop of Lotus tennuis, a strategic legume to improve pasture, is constrained by the limited competitive ability of its seedlings. In this article we evaluated the influence of the environmental variations of water, light and nutrients on the characters involved in the implantation of populations of L. tennuis: air dry weight (PSA), number...
Article
The slow initial growth of Lotus tennis limits its use to improve the Flooding Pampas grasslands by mean of its inter-sowing. Research on the inter and intra-population variability of seedling vigor under changing environmental conditions, and the population x environment interaction, contribute to design sowing strategies and selection criteria. T...

Citations

... L. corniculatus is an important option for livestock feed, it grows best in cold and humid climates, although also in tropical and subtropical climates. Like all fodders, it has marked disadvantages, such as slow initial establishment and low persistence (Ixtaina and Mujica, 2010). ...
... One important mechanism which contributes to plant species persistence on rangelands is natural reseeding which depends on viable seed contribution into the soil seed bank. This was proved at the field under grazing conditions; for example, with the variety Aguapé of Lotus tenuis (Entio and Mujica, 2011). The soil seed bank can work as such as long as the disseminules preserve their viability (Baker, 1989). ...
... Evaluando atributos de vigor en plántulas en dos poblaciones de Pappophorum vaginatum Brevedan et al. (2014) pesaron y sembraron individualmente 100 cariópsides de cada una de dos poblaciones, determinando a 43 días de siembra longitud aérea, longitud radical, longitud total, longitud de raíz adventicia de mayor tamaño, número de raíces adventicias, número de hojas, número de hojas senescentes, número de macollos, peso seco aéreo y peso seco radical, evaluando la variabilidad mediante prueba de "t" y estadística descriptiva, además de correlación entre caracteres y regresión múltiple de los caracteres con la producción total de materia seca, indicando que la variabilidad encontrada dentro y entre poblaciones implica respuestas a la selección, la producción de materia seca total varió únicamente dentro de poblaciones lo que sugiere avances en la selección intrapoblacional de Pappophorum vaginatum. En Pappophorum spp., el valor nutritivo decrece rápidamente con la edad del rebrote y la digestibilidad de la materia seca oscila de 45 a 55%, dependiendo de la edad de éste (Estelrich y Cano, 1995). ...
... subsp. pentzii (Stent) Kok.], when exposed to water stress, showed a reduction in total germination, although some germination could still be observed at a very low water potential (−1.5 MPa) (Brevedan et al. 2013). Finally, some germination of sideoats grama [Bouteloua curtipendula (Michx.) ...
... Climate is temperate-semiarid, with 421 mm of mean annual precipitation (1981-2012) with a maximum of 877 mm in 1984 and a minimum of 196 mm in 2009 (Torres et al., 2013). Mean annual temperature is 14. 1°C (1981-2012Torres et al., 2013). ...
... Así mismo, la relación positiva y significativa entre el carácter n°t y el peso seco promedio por individuo de cada grupo de número de tallos, coincide con lo comunicado por Ixtaina y Mujica (2010a, 2010b. Esto se podría considerar como una alternativa de habilidad competitiva individual, donde los genotipos con mayor número de tallos son más exitosos en la acumulación de peso seco individual por ser más vigorosos. ...
... En este estudio los grupos de 1 y 3 tallos en la corona resultaron los de mayor frecuencia y el número promedio de tallos en la corona por individuo fue de 2,4. En otras investigaciones (Mujica y Rumi, 1998;Ixtaina y Mujica, 2010b) donde se utilizaron densidades de plántulas menores a las de este estudio, se comunicaron valores medios para número de tallos en la corona por individuo de entre 3,5 y 5,6. Esto permite considerar que una situación de alta densidad, como la ensayada en las 11 poblaciones estudiadas, favorecería una baja producción 1 2 3 4 5 6 7 1 2 3 4 5 6 7 1 2 3 4 5 6 7 1 2 3 4 5 6 7 1 2 3 4 5 6 7 1 2 3 4 5 6 7 1 2 3 4 5 6 7 1 2 3 4 5 6 7 1 2 3 4 5 6 7 1 2 3 4 5 6 7 1 2 3 4 5 6 7 PN I P N II PN III PN IV PN V P N VI PN VII P N VII P N IX PN X P N XI Conjunto de poblaciones Fig. 1. ...
... To conserve Pampas birds in these agroecosystems, it is necessary to combine conservation of grassland elements and livestock management, particularly during the breeding season (Temple et al. 1999). The introduction of Lotus pastures is an effective way to increase livestock productivity and could be continued sustainably by activities such as intercropping of Lotus pasture and native grasses (Entio and Mujica 2011) and sustainable grassland management (Jacobo et al. 2006;Jacobo 2010, 2012;Isacch and Cardoni 2011;Bilenca et al. 2012). Such sympathetic livestock production, along with grassland conservation, is needed to sustain the biodiversity of the Flooding Pampas. ...
... La inhibición en la germinación puede deberse a que los metabolitos secundarios presentes en el extracto estarían inactivando las enzimas presentes en la degradación de almidón (hidrolasas) y lípidos, y tampoco se permitiría el debilitamiento de las paredes celulares de la semilla (Bewley et al., 2013), con lo que la germinación no se llevaría a cabo. La inhibición de la germinación también se encontró con extractos acuosos de eucalipto que generaron efectos inhibitorios previos a la emergencia de Lactuca sativa L. (Asteraceae) y Agrostis stolonifera L. (Poaceae) (Puig et al., 2018), lo que permite evidenciar que este tipo de extractos causa una disminución en la germinación (Tucat et al., 2013). ...
... At the beginning of October 2012 the soil in the 0.025 ha exclosure was prepared before transplanting. This was because it was compacted as a result of previous studies [18]. With the purpose of having a loose soil, weed control and soil aeration, tillage was conducted twice. ...