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9 results on '"Ambrosino, Mariela L."'

3. Root traits contributing to water stress tolerance in two perennial grasses in semiarid rangelands of central Argentina.

Author

Torres, Yanina A. and Ambrosino, Mariela L.

Subjects
SEXUAL cycle, WATER supply, WATER restrictions, IMAGE analysis, DIGITAL images
Abstract

Copyright of Lilloa is the property of Fundacion Miguel Lillo and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2024
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5. Endophytic Occupation in Nodules of Rhynchosia Plants from Semiarid Regions of Argentina.

Author

Lucero, Cinthia T., Ruíz, María de los Á., Pagliero, Fabiola, Castaño, Carolina, Ambrosino, Mariela L., and Lorda, Graciela S.

Subjects
RHYNCHOSIA, SOIL structure, SUSTAINABLE development, PLANT regulators, PLANT growth-promoting rhizobacteria
Abstract

Beneficial microbes can improve soil health by promoting soil structure, nutrient cycling, and disease suppression. In addition, a wide array of rhizospheric microbes are responsible for producing metabolically active compounds including various types of plant growth regulators. So, microbial biodiversity studies could contribute to the improvement of agricultural practices in deprived areas, such as the Pampean semiarid region. The vast majority of studies conducted on endophytic microorganisms have focused on intensive crop legume species. In contrast, little attention has been paid to microorganisms of native legumes, whose ecology is not directly affected by human action. In this study, endophytic microorganisms isolated from root nodules of a selected native legume of the genus Rhynchosia were characterized. Viable isolates were studied with a focus on their plant growth-promoting rhizobacteria (PGPR) properties. Considering the edaphic characteristics of the Pampean semiarid region, the isolates obtained were evaluated for their ability to grow under three salt stress conditions (50, 100, and 200 mM NaCl) and four different pH values (6, 7, 8, and 9). Based on their PGPR activities, the selected strains were phylogenetically grouped using BOX-PCR. The results showed great variability among the isolates in terms of the characteristics studied. Native legumes manifested a wide endophytic variability and remarkable performance in PGPR activities. We conclude that they could be used as potential bioinoculants for legume cultivation, an excellent alternative to the use of chemical fertilizers that currently pollute the environment. [ABSTRACT FROM AUTHOR]

Published
2024
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6. Adequate management of defoliation post-fire would not affect the metabolic activity of axillary buds on grasses

Author

lthurrart, Leticia S., Busso, Carlos A., Torres, Yanina Alejandra, Giorgetti, Hugo D., Rodriguez, Gustavo D., and Ambrosino, Mariela L.

Subjects
Controlled burning, Bud's metabolic activity, Agronomía, reproducción y protección de plantas, fungi, food and beverages, Rangelands
Abstract

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-burn defoliation affects the number of axillary buds and/or their metabolic activity in Poa ligularis, Nassella tenuis (both desirable plant species) and Amelichloa ambigua (undesirable plant species). We found that the treatments limited neither bud production nor their metabolic activity. The greatest number of total and viable buds in the studied plant species was recorded at the vegetative stage. Poa ligularis had the lowest bud number per tiller but the greatest per plant. Our results thus indicate that moderate defoliation after controlled burning does not affect the survival and productivity of the desirable species.

Published
2019

8. Evaluation of the conceptual model on shrubbiness-desertification on arid rangelands

Author

Torres, Yanina Alejandra, Busso, Carlos A., Ithurrart, Leticia S., and Ambrosino, Mariela L.

Subjects
arbuscular mycorrhiza, soil biological crusts, Agronomía, reproducción y protección de plantas, arid rangelands, Ecología, shrubbiness, desertification
Abstract

Advancement of shrubbiness (increase in plant cover and density of woody species) on different environments world-wide has generated an increasing interest in the scientific community, particularly because of its association with the desertification process which is increasing, also at a world-wide level. There are two opposing positions, both of them validated by scientific evidences. The greatly accepted position recognizes shrubbiness as one of the mechanisms conducive to desertification in natural environments, cataloguing it as a negative process. A different view, based on recent studies, suggests that shrubbiness should be considered as a positive process because it may drive a reversal of desertification, depending on the environment and the species of shrub studied at a site. This review presented within this framework discusses the existing relationship between shrubbiness and desertification and proposes an approach that should be considered in future research. ISSN 0570-1791

Published
2018

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