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January 1985 - present
January 1980 - present
Publications
Publications (51)
The aerial growth dynamics of the shoots of the widespread turfgrass Paspalum vaginatum was studied. With the aim of identifying quantitative differential features between two genotypes, plants were cultivated outdoors in pots during two consecutive summers. Axes of different branching order were marked for periodical observation to quantify intern...
Sooty molds are a lineage of foliar fungi that is located on the surface of the leaf and does not penetrate the cuticle. The aim of this study was to evaluate changes in the temperature of the leaves of orange plants due to the increased absorption capacity of long-wave radiation caused by the black colour of the sooty mold mycelia and to investiga...
In fruit trees, flooding stress can affect plant survival and growth, and tolerance to root anoxia is determined by rootstock characteristics. Similarly to almond, peach trees are also among the Prunus species proving most susceptible to root anoxia in flooded soils. The aim of our study was to investigate the short-term responses to flooding of di...
Seed germination of the kiwifruit ( Actinidia deliciosa A. Chev. C.F. Liang and A.R. Ferguson), a deciduous, perennial vine, is low because of seed dormancy. The main purpose of this study was to characterize kiwifruit seed dormancy and germination in response to environmental factors such as temperature and light. Dormancy of hydrated seeds is all...
Morphological and physiological responses to freezing were evaluated in two ecotypes of the perennial turfgrass Paspalum vaginatum. Leaf extension rate, number of active meristems, leaf water potential and net photosynthesis were measured on plants of both a commercial cultivar, ‘Sea Isle 2000’, and a wild ecotype from the Flooding Pampa grasslands...
Sooty molds are a lineage of follicolous fungi that cover the upper surface of leaves with black mycelia. Sooty molds do not infect plants, but grow on surfaces where honeydew deposits accumulate. It causes a reduction of incident sunlight by physical obstruction and in some species it interferes with photosynthesis. However, there are no studies p...
Information about the local response to fertilization in pecan trees is very limited. Here, we investigated the effects of fertilization with different levels of nitrogen (N), phosphorus (P) and zinc (Zn) on the chemical composition of leaves of pecan trees of the 'Stuart' cultivar. Fertilization had a positive impact on foliar N concentration, a n...
Plant root aeration relies on aerenchyma and barrier formation in outer cortex influencing the radial oxygen loss (ROL) from roots towards the rhizosphere. Plant species display large variation in strategies for both responses. We investigated the impacts of root-zone hypoxia on aerenchyma formation and development of ROL apoplastic barriers in the...
Jatropha curcas is a promissory species for biodiesel production. Chilling and freezing stress are major environmental constraints for its establishment as a result of the injury provoked on leaf photosynthetic apparatus. This study is aimed at evaluating the impact of chilling (40 h at 4 °C) and freezing (2 h at −1, −2 and −3 °C) on maximum leaf p...
Our aim was to search for specific seed germinative strategies related to flooding escape in Setaria parviflora, a common species across the Americas. For this purpose, we investigated induction after floods, in relation to fluctuating temperature requirements for germination in seeds from mountain, floodplain and successional grasslands. A laborat...
Questions: What are the interactive effects of flooding and cattle trampling upon the structural attributes and the floristic composition of a plant community? Do the effects on the plant community persist over an extended recovery period?
Location: Flooding Pampa grasslands, Argentina (36°30′ S, 58°30′ W).
Methods: We assessed the effects of 40-d...
It was hypothesised that subtle topographical differences might cause the existence of ecotypes along a floodplain. The apomict grass Paspalum dilatatum subspecies dilatatum inhabits flood-prone lowlands as well as nearby uplands in the floodplains of Argentina, while the sexual P. dilatatum subspecies flavescens almost exclusively inhabits the upl...
Two main strategies that allow plants to cope with soil waterlogging or deeper submergence are: (1) escaping by means of upward shoot elongation or (2) remaining quiescent underwater. This study investigates these strategies in Lotus tenuis, a forage legume of increasing importance in areas prone to soil waterlogging, shallow submergence or complet...
We explored the hypothesis that, in flood-prone habitats, nitrates can signal to seeds that a drawdown period has begun. To investigate this issue, Setaria parviflora (Poir.) Kerguélen seeds were buried in a never-flooded upland and a nearby, flood-prone lowland grassland. Seeds were exhumed during the flooding period. Additionally, grassland mesoc...
The soil moisture regime may affect dormancy of seeds and their sensitivity to signals that promote germination. We studied the effect of moisture regime on the sensitivity to light of dormant Bromus catharticus seeds, and on the emergence pattern of seedlings. Seeds were incubated under continuously hydrated, continuously dehydrated, or fluctuatin...
The grass Paspalum dilatatum Poir. subsp. dilatatum inhabits periodically flooded lowlands as well as non-flooded uplands of the flooding Pampa grasslands (Argentina), while P. dilatatum Poir. subsp. flavescens Roseng., B.R. Arrill. & Izag. inhabits only the upland sites. An experiment was designed to determine if there is local adaptation to flood...
Flooding and grazing are major disturbances that simultaneously affect plant performance in many humid grassland ecosystems. The effects of flooding on plant recovery from defoliation were studied in two species: the grass Paspalum dilatatum, regrowing primarily from current assimilation; and the legume, Lotus tenuis, which can use crown reserves d...
The objective of this work was to study the existence of a trade-off between aerenchyma formation and root mechanical strength. To this end, relationships among root anatomical traits and mechanical properties were analysed in plant species with contrasting root structural types: Paspalidium geminatum (graminaceous type), Cyperus eragrostis (cypera...
The effect of flooding on the dormancy level of Setaria parviflora seeds from a non-flooded upland and a seasonally (winter–spring) flooded lowland in the Pampa grasslands of Argentina was investigated. Seeds from both communities were subjected to reciprocal burial treatments in the two habitats, and exhumed during and after the flooding season. E...
Abstract Flooding provokes the death of many dicotyledonous species in grazed grasslands of the Flooding Pampa in Argentina, including the clonal plant Ambrosia tenuifolia, which produce the opening of numerous gaps. The objective of this study was to investigate the recolonization of grassland by A. tenuifolia after this species disappeared due to...
Seed dormancy in Sorghum halepense is overcome by exposure to fluctuating temperatures and the effect is determined both by the diurnal amplitude and the maximum temperature. It was found that repeated cycles of particular regimes were additive, each cycle resulting in release from dormancy of a further proportion of the population. The range of re...
A mathematical model to predict Sorghum hale-pense seedling recruitment dynamics in relation to soil temperature was derived from the experimen-tal results obtained in a previous investigation. The model is based on the assumption that soil temperature controls seedling recruitment of S. halepense by controlling release from dormancy and germinatio...
Summary • Knowledge of the regulatory effects of the crop canopy on weed seed germination is necessary to understand fully the behaviour of weed seed banks during a crop cycle. It is well known that canopy presence interferes with seed germination through modifications to the light and thermal environment, but the changing effect of a growing canop...
Summary • We studied the differences in root strength of species with contrasting root structural types (the grass Paspalum dilatatum and the dicot Lotus glaber), and their relationship with tolerance to simulated cattle trampling under flooding conditions. • Root strength was analysed through measurement of the pressure required to cause root coll...
Lotus corniculatus L. and Lotus glaber Mill. are warm-season legume species adapted to many kinds of environmental stress, including flooding conditions, whereas
other popular forage legumes, like alfalfa or white clover, cannot thrive. This study evaluates the relationship between root
aerenchyma, water relations and leaf gas exchange and the diff...
Summary • We studied individual responses to flooding in the perennial grass Paspalum dilatatum, a widespread species in the Flooding Pampa of Argentina, using plants established in species-diverse grassland microcosms. • Flooding effects were evaluated on root and leaf sheath anatomy and shoot morphological traits. Leaf water status and CO2 exchan...
Natural flooding is a major component of the disturbance regime in many grassland ecosystems. The objective of this study was to analyze the relationship among constitutive and plastic root traits and tolerance to flooding in coexisting perennial species of the flooding pampa grasslands (Argentina). A mesocosm experiment was designed for five nativ...
Preharvest sprouting (PHS) susceptibility in cereals is a consequence of low grain dormancy before harvest. Dormancy loss rate depends on genotype and may also be affected by environmental conditions during seed formation. To establish a quantitative relationship between temperature and PHS susceptibility, a malting barley (Hordeum vulgare L.) cult...
Preharvest sprouting (PHS) susceptibility in cereals is a consequence of low grain dormancy before harvest. Dormancy loss rate depends on genotype and may also be affected by environmental conditions during seed formation. To establish a quantitative relationship between temperature and PHS susceptibility, a malting barley (Hordeum vulgare L.) cult...
Periodic long-lasting floods are a major component of the natural disturbance regime affecting grassland vegetation in the Flooding Pampa, Argentina. Chronic grazing by livestock imposes a different, and potentially conflicting, environmental constraint on vegetation structure in this system. Grazing reduces graminoid biomass and increases the abun...
Natural flooding is one of the major factors affecting vegetation dynamics in many regions of the world. The Flooding Pampa Grasslands (Argentina) are frequently exposed to flooding events of diverse intensity and duration, some of which Leontodon taraxacoides, an exotic dicot. frequent in these grasslands, seems to survive. Its responses to four d...
We studied the responses in growth and N content of the perennial grass Paspalum dilatatum to the substitution of Lotus tenuis for a whole group of species, the dicotyledons of a natural grassland community, in the Salado lowland Pampas of Argentina.
Two kinds of manipulations were performed in the field: removal of alien dicots with herbicide appl...
Strong fluctuations are exhibited by populations of the perennial herb Ambrosia tenuifolia in the grasslands of the Salado basin (Province of Buenos Aires, Argentina), an area frequently enduring prolonged floods. Flooding causes the death of most dicotyledon plants of the community, A. tenuifolia among them, opening numerous gaps of various sizes....
