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Bo M.L.,National University of Cordoba | Carrizo Garcia C.,Instituto Multidisciplinario Of Biologia Vegetal
Grana | Year: 2015

The rocoto chili (Capsicum pubescens) is a species native to the highlands of South America, which is cultivated for its fruits. The species is regarded as self-compatible; however, self-incompatible strains and even a variable degree of self-incompatibility have been found. To characterise pollen grains and determine whether there is also variation in pollen performance and male fertility in the species, pollen morphology, cellular state, starch content, viability, longevity and germinability were analysed in plants obtained from the germplasm cultivated in Argentina. All the individuals studied were male fertile, showing a high percentage of vital pollen, capable of germinating in vitro. Some pollen features were uniform (e.g. exine sculpture, number of nuclei at maturity), but there were significant variations in pollen performance among the plants studied. © 2014, © 2014 Collegium Palynologicum Scandinavicum.

Hernandez M.L.,Centro Regional Of Investigaciones Cientificas Y Transferencia Tecnologica | Dujardin J.P.,Institute Of Recherches Pour Le Developpement | Gorla D.E.,Centro Regional Of Investigaciones Cientificas Y Transferencia Tecnologica | Gorla D.E.,Instituto Multidisciplinario Of Biologia Vegetal | Catala S.S.,Centro Regional Of Investigaciones Cientificas Y Transferencia Tecnologica
Revista da Sociedade Brasileira de Medicina Tropical | Year: 2015

Introduction: Insects of the subfamily Triatominae are vectors of Trypanosoma cruzi, the Chagas disease parasite, and their flying behavior has epidemiological importance. The flying capacity is strikingly different across and within Triatominae species, as well as between sexes or individuals. Many Triatoma infestans individuals have wings but no flying muscles. In other Triatominae species, no clear relationships were found between wing length and flying behavior. If wing presence or size is not reflective of the flying behavior, which other parts of the body could be considered as reliable markers of this important function? Methods: The genus Mepraia has exceptional characteristics with invariably wingless females and wingless or winged males. We calculated the porous surface exposed to odorant molecules to estimate the olfactory capacity of Mepraia spinolai. The head shape and thorax size were estimated using the geometric morphometric approach and traditional morphometric techniques, respectively. Results: Alary polymorphism in M. spinolai was significantly associated with consistent modification of the thorax size, head shape, and notable change in the estimated olfactory capacity. The macropterous individuals had a larger olfactory surface and thorax size and significantly different head shape compared to those of the micropterous individuals. Conclusions: We concluded that these structural changes could be associated with the flying potential of Triatominae. Thus, morphological attributes not found on wings could help determine the likely flying potential of the bugs. © 2015, Sociedade Brasileira de Medicina Tropical. All rights reserved.

Pollice J.,National University of Cordoba | Pollice J.,CONICET | Marcora P.,CONICET | Marcora P.,Instituto Multidisciplinario Of Biologia Vegetal | And 2 more authors.
New Forests | Year: 2013

The expansion of tree species within a grassland-woodland matrix relies heavily on an abundant seed crop, which may be affected by many factors; among these, browsing by livestock has gone largely ignored. Here we explore how seed production is affected by tree size, grazing by large domestic herbivores and interannual climate fluctuations in a small-sized tree (Polylepis australis, Rosaceae), which dominates the remnant forests in the high mountains of central Argentina. Seed number and seed mass per tree were quantified in 100 different-sized trees located in areas with and without livestock. Using seed traps we also determined seed rain variation in 15 plots between 2005 and 2008. The estimated number of seeds per tree ranged from 0 to 224,000 and increased with tree height (power relation); for trees smaller than 354 cm in height, seed production was lower in areas with livestock and higher in areas without livestock. Mass per seed increased with tree height, with no significant livestock effect. The largest seed rain was recorded in 2008, probably due to growth of seed trees and not in response to climate. To promote seed production and forest expansion, livestock should be excluded from areas with small trees, such as forest edges. © 2012 Springer Science+Business Media B.V.

Bonzani N.E.,Instituto Multidisciplinario Of Biologia Vegetal | Bravi V.S.,National University of Cordoba | Barboza G.E.,Instituto Multidisciplinario Of Biologia Vegetal
Caldasia | Year: 2011

Morphological and anatomical studies on the gynoecium and fruit of Mentha species (sect. Mentha L. and sect. Pulegium (Mill.) Coss. & Germ.) from Argentina were done using optic and scanning electronic microscope. Some novelties on the gynoecium, nectary histology, microsculpture of the nutlets, epicuticular waxes in the hilum and the morphology of the crystalloids are reported for the first time for Mentha. Four types of microsculpture on the surface of the nutlets were established. The results are evaluated from a taxonomical point of view for species delimitation. In addition, myxocarpy is reported for M. citrata, M. x piperita and M. spicata for the first time and its occurrence is discussed.

Avalos D.S.,National University of Cordoba | Ricobelli G.,Instituto Multidisciplinario Of Biologia Vegetal | Palacios S.M.,Catholic University of Cordoba | Defago M.T.,Instituto Multidisciplinario Of Biologia Vegetal
Revista de la Facultad de Ciencias Agrarias | Year: 2013

In Argentina several genotypes of chickpea (Cicer arietinum L.) have been developed to be cropped in environmentally different production areas. These have different phenotypes which could affect oviposition preferences of the behavior of leafminer. The aims of this study were two-fold: 1) to determine if leafminer Liriomyza spp. has a preference for any chickpea genotype, and 2) to evaluate the insecticide effect of Melia azedarach extracts on susceptible genotypes. Two selected lines and two cultivars of C. arietinum were planted in the experimental field of the FCA, UNC, in randomized blocks with three replications. Through weekly surveys, the preference of the flies in the period from July to September was determined by recording their presence in plants. The leafminer significantly choice the genotype with entire and large leaves. Subsequently, they were treated with botanical extracts by selecting five plants on each block: fifteen of them were treated with a 10% M. azederach extract and the other fifteen only with water (control). Number of mined leaves, pupae and emerged adults decreased after the treatment with the extract. Additional studies are needed to consider this natural compound in a management plan for the herbivore.

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