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Yanina Alejandra Torres

Yanina Alejandra Torres
Comisión de Investigaciones Científicas (CIC) - Universidad Nacional del Sur · Dpto. Agronomía

Lic. en Ciencias Biológicas- Dra. en Agronomía

About

43
Publications
5,628
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172
Citations
Citations since 2016
20 Research Items
126 Citations
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2016201720182019202020212022051015202530
2016201720182019202020212022051015202530
2016201720182019202020212022051015202530

Publications

Publications (43)
Preprint
Full-text available
Purpose Shrub encroachment has been associated with changes in the spatio-temporal distribution of soil nutrient and vegetation. We determined the effect of shrub cover on chemical and biochemical indicators of soil quality (SQ) in a semiarid Monte rangeland of Argentina. Methods In spring 2017 and 2018, 6 paddocks were selected and 10 m transects...
Article
The objective of this study was to evaluate the effects of moderate defoliation and grass species on soil nitrogen (N) mineralization in a semiarid grassland of northeastern Patagonia, Argentina. Studied species were Poa ligularis and Nassella tenuis (desirable/preferred by cattle) and Amelichloa ambigua (undesirable/non preferred). Two defoliation...
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
Natural grasslands are an important renewable resource for livestock production. Grazing in these areas alters the plant community composition, litter quality, and soil microbial structure and activity. Three cool-season species were studied in a semiarid rangeland area of Argentina: Poa ligularis and Nassella tenuis (desirable for livestock) and A...
Article
Full-text available
Schinus johnstonii F. A. Barkley (Anacardiaceae) es un arbusto nativo de la Provincia Fitogeográfica del Monte, donde representa un importante componente del pastizal natural. Su tolerancia a la sequía, junto a la presencia de una floración abundante, la convierten en una buena opción para proyectos paisajísticos y de restauración de ambientes degr...
Article
Full-text available
Controlled burning is often used to improve plant structure on rangelands adapted to fire. However, possible damage resulting from post-fire grazing to reappearing desirable plant species may be a serious issue hindering usage of this method. Axillary buds are essential for the re-establishment of the photosynthetic leaf area. We studied if post-bu...
Article
Full-text available
Plant litter decomposition is critical for terrestrial ecosystem productivity. Poa ligularis Nees ex Steud and Nassella tenuis (Phil.) Barkworth are native, desirable perennial grasses in central Argentina’s rangelands. Amelichloa ambigua (Speg.) Arriaga & Barkworth is only consumed when a better forage is unavailable. Litter traps were used to col...
Article
Full-text available
The objectives of this study were to determine the percentage of root colonization by arbuscular mycorrhizal (AM) fungi at various levels of plant species richness and developmental morphology stages in various perennial grass, and herbaceous and woody dicots species using experimental plots during 2013 and 2014. An auger was used to obtain six rep...
Article
Full-text available
Defoliation can compromise the quality and quantity of colonization by arbuscular mycorrhizal fungi (AMF), which contribute to vegetation persistence in semiarid rangelands. The effects of defoliation on total arbuscular mycorrhizal (AM) colonization percentage and on that of its structures (i.e., vesicles, arbuscules) were evaluated on three nativ...
Article
Vegetation management practices, such as defoliation may alter the composition of plant communities and/or the fungi-forming arbuscular mycorrhiza (AMF). We determined the species identity, density, frequency and diversity of AMF spores from soil under the canopies of three native perennial grass species in rangelands of Argentina: 1) Poa ligularis...
Article
Full-text available
Studies on basal soil respiration (i.e., under undisturbed conditions) are very important because they can be used as indirect indicators of the biological activity in those soils; this ecological process is recognized as the major source of carbon flux from the soil surface, and one of the crucial components of the carbon cycle in terrestrial ecos...
Article
Full-text available
Total soil available nitrogen concentrations (NO –3 +) were determined underneath plants of the more-competitive Poa ligularis, mid-competitive Nassella tenuis and the less-competitive Amelichloa ambigua exposed to various combinations of controlled burning and defoliation treatments. Defoliations were at the vegetative (V), internode elongation (E...
Article
Full-text available
ABSTRACT Our objectives were to (1) determine the effects of light on seed germination of 2 populations (P1, P2) of Pappophorum vaginatum, and (2) compare the germination responses between these populations. Because of this, two studies were conducted. The first study evaluated the effects of 2 light conditions (L0=darkness, and L1=14 h light) on t...
Article
Full-text available
We used long-term datasets (1984-1992) to contrast precipitation- use efficiency estimates between various disturbance kinds at a functional group and/or a species scale. Effects of varying amounts of precipitation and plant cover on PUE were also examined. Field studies were conducted at northeastern, arid Patagonia, Argentina (40°39'49″S, 62°53'6...
Article
Full-text available
We contrasted total herbaceous ANPP and cover between various disturbance types (Control, Burning, Shrub Control, Old Field 1, Old Field 2, Overgrazing) at a functional group (CSPG= cool-season perennial grasses; WSPG= warm-season perennial grasses; CSAG + D= cool-season annual grasses + dicots) and a species scale during 1984-1992. Results showed...
Article
Full-text available
Cardillo, Daniela S.; Carlos A. Busso; Mariela Ambrosino; Yanina Torres; Leticia Ithurrart; Oscar Montenegro. 2015. “Grasses (Poaceae) of the District of Coronel Rosales (Province of Buenos Aires, Argentina)”. Lilloa 52 (2). Grasses (i.e., Poaceae) are one of the more numerous, described families with more than 670 genera and about 11,000 species....
Poster
Full-text available
La persistencia de las plantas a diferentes disturbios como la defoliación, puede ser consecuencia de múltiples estrategias por ejemplo, la simbiosis con hongos formadores de micorrizas arbusculares (HFMA, Glomeromycota). Las esporas, por su capacidad de supervivencia y mayor tolerancia a las situaciones adversas son responsables de perpetuar los H...
Article
Full-text available
The 2,3,5-triphenyltetrazolium chloride (TTC) technique has been used during decades to distinguish between dead and alive tissues of perennial grasses. This technique did not consider, however, that dormant (i.e., viable) tissues could exist within those erroneously considered dead tissues, thus being unable to report the true physiological stage...
Article
Full-text available
The 2,3,5-triphenyltetrazolium chloride (TTC) technique has been used during decades to distinguish between dead and alive tissues of perennial grasses. This technique did not consider, however, that dormant (i.e., viable) tissues could exist within those erroneously considered dead tissues, thus being unable to report the true physiological stage...
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...
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
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
Full-text available
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...
Chapter
Full-text available
Rangelands from central Argentina characterize by insufficient warm-season, palatable perennial grasses to domestic livestock. Two palatable and water-stress tolerant cultivars (Magnar and Trailhead) of Leymus cinereus were introduced into Argentina with the purpose of increasing the warm-season forage offer. Some mechanisms involved in determining...
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
Full-text available
In the Monte Austral Neuquino, Argentina, vegetation is arranged in patches. Understanding the mechanisms involved in their distribution is critical for preventing desertification. The working hypothesis was that vegetation patches reduce environmental stress on the plants. Plant patches were classified into four microenvironments: windward; below...
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
Full-text available
Osmotic adjustment has been recognized to be an important adaptive response to water stress in higher plants. Although Leymus cinereus cv. "Trailhead" is reputedly a very drought-tolerant rangeland plant, its ability to adjust osmotically in the field has not previously been reported. This study examined the occurrence or not of osmotic adjustment...
Article
The objective of this work is to contribute to the biology of Pavonia cymbalaria A. St. Hil & Naudin (Malvaceae), a native species of the Southern mountains of Buenos Aires Province. This knowledge will contribute to (1) promote its use as an ornamental species, (2) its conservation and (3) stimulate the interest and public valuation of mountain sy...
Article
Full-text available
Pavonia cymbalaria A. St.-Hil. & Naudin (Malvaceae) is a native species of the southern mountains in the Province of Buenos Aires. Its morphological characteristics become it as a potential candidate for ornamental use. Crop requirements and seed germination were evaluated for this species in this study. Different treatments were applied to 640 mer...

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