Acacia saligna
0 Followers
Recent papers in Acacia saligna
Acacia saligna (Labill.) Wendl. is native of southwestern Australia, but has been planted extensively in many areas of the world, including the Mediterranean region, becoming highly invasive especially in coastal habitats. The aim of this... more
Acacia saligna (Labill.) Wendl. is native of southwestern Australia, but has been planted extensively in many areas of the world, including the Mediterranean region, becoming highly invasive especially in coastal habitats. The aim of this study was to test whether the indigenous Rosmarinus officinalis L. essential oil (EO), loaded in liposomes, can inhibit the seed germination of the invasive alien Acacia saligna. Variability in seed germination requirements and responses among populations were evaluated. Germination tests under light, at constant temperatures and three concentrations of rosemary EO were carried out. Among the examined factors, only the EO amount and temperature had a highly significant effect on seed germination. The lowest EO quantity did not show differences compared with the control, while the highest amount inhibited significantly seed germination of all populations at all the tested temperatures. No seed recovered the ability to germinate after the EO treatment with either of the two washing methods. Our results allowed us to identify the minimum amount of rosemary EO capable of inhibiting the seed germination of the invasive Acacia saligna. These results could be useful for the control of this invasive alien species, thus allowing the conservation of indigenous Mediterranean plant species and habitats. Résumé : Acacia saligna (Labill.) Wendl. est indigène dans le sud-ouest de l'Australie, mais elle a été largement plantée dans plusieurs régions dans le monde, y compris dans la région méditerranéenne, devenant hautement envahissante, spécialement dans les habitats côtiers. L'objectif de cette étude consistait à tester si l'huile essenti-elle (HE) de Rosmarinus officinalis L. indigène, chargée dans des liposomes, peut inhiber la germination des graines de l'espèce exotique envahissante Acacia saligna. La variabilité des besoins pour la germination des graines et les réponses des populations ont été évaluées. Des tests de germination sous la lumière, à des températures constan-tes et en présence de trois concentrations d'HE de romarin ont été réalisés. Parmi les facteurs examinés, seules la quantité d'HE et la température exerçaient un effet hautement significatif sur la germination des graines. La quantité d'HE la plus faible n'était pas différente du contrôle, alors que les quantités les plus élevées inhibaient significativement la germination des graines de toutes les populations à toutes les températures examinées. Aucune des graines ne récupérait la capacité de germer après un traitement à l'HE, quelle que soit la méthode de lavage utilisée parmi les deux qui ont été testées. Les résultats ont permis aux auteurs d'identifier une quantité minimale d'HE de romarin capable d'inhiber la germination des graines de l'espèce envahissante Acacia saligna. Ces résultats pourraient être utiles pour contrôler cette espèce exotique envahissante, permettant ainsi la conservation des espèces indigènes méditerranéennes et de leurs habitats. [Traduit par la Rédaction]
Soil salinity is one of the main abiotic constraints limiting plant growth. This paper focuses on the concept of internal adaptation in relation to salt tolerance during the vegetative phase. Under saline conditions, we evaluated some... more
Soil salinity is one of the main abiotic constraints limiting plant growth. This paper focuses on the concept of internal adaptation in relation to salt tolerance during the vegetative phase. Under saline conditions, we evaluated some anatomical changes in stems (area, perimeter, cortex thickness, stele area, stele perimeter, pith area) and roots (thickness, cortex thickness and stele thickness) of two acacia species (A. karroo and A. saligna). Plants of 90 days old were cultured at various concentrations of NaCl (0, 200, 400 and 600 mM) for 21 days. The experiment was laid out in completely randomized design with four replications. For microscopic analysis, the stem tissues were cross-sectioned and the root were profile viewing. Results showed that salt caused remarkable changes in some anatomical-related parameters. Microscopic studies showed that every acacia species had made its own anatomical changes in stem and root by increasing/decreasing organ area, such as cortex thickness, stele thickness and pith area compared to control. In conclusion, under saline regimes, both species adapted specific characteristics of the roots and stems for better survival under saline environments.
Abstract Using essential oils (EOs) to suppress unwanted species at the seedling stage is a promising way to decrease the use of synthetic herbicides and thus protect native plant diversity. We verified the effects of rosemary (Salvia... more
Abstract Using essential oils (EOs) to suppress unwanted species at the seedling stage is a promising way to decrease the use of synthetic herbicides and thus protect native plant diversity. We verified the effects of rosemary (Salvia rosmarinus) EOs at different concentrations on the growth and mortality of seedlings of the invasive alien species Acacia saligna derived from seeds collected at four wild populations in Sardinia and Sicily (Italy), by monitoring their survival, dry weight, shoot and root length during their early development. Six different spray solutions were applied to A. saligna seedlings: one with only distilled water; one with a solution of distilled water, ethanol and Tween 20; three with a rosemary EO concentration of 3.9, 7.8 and 15.6 mL/L; and one with the commercial herbicide DICOTEX© RTU. The seedling survival and growth decreased with the increase of EO concentrations; the patterns were similar for all populations. The highest rosemary EO concentration tested (15.6 mL/L) strongly inhibited shoot and root length, dry weight and survival of A. saligna seedlings and its effect was significantly different compared to the other EO and control treatments, except for the control with commercial herbicide, that was the more effective compared to all other treatments. Our results suggest that the rosemary EO concentration at 15.6 mL/L is a valid tool for the biological control of A. saligna. This treatment is promising because it could be applied primarily to reduce the seedlings’ emergence/development and establishment while ensuring the conservation of native plant diversity and the preservation of the Mediterranean habitats.
Using essential oils (EOs) to suppress unwanted species at the seedling stage is a promising way to decrease the use of synthetic herbicides and thus protect native plant diversity. We verified the effects of rosemary (Salvia rosmarinus)... more
Using essential oils (EOs) to suppress unwanted species at the seedling stage is a promising way to decrease the use of synthetic herbicides and thus protect native plant diversity. We verified the effects of rosemary (Salvia rosmarinus) EOs at different concentrations on the growth and mortality of seedlings of the invasive alien species Acacia saligna derived from seeds collected at four wild populations in Sardinia and Sicily (Italy), by monitoring their survival, dry weight, shoot and root length during their early development. Six different spray solutions were applied to A. saligna seedlings: one with only distilled water; one with a solution of distilled water, ethanol and Tween 20; three with a rosemary EO concentration of 3.9, 7.8 and 15.6 mL/L; and one with the commercial herbicide DICOTEX© RTU. The seedling survival and growth decreased with the increase of EO concentrations; the patterns were similar for all populations. The highest rosemary EO concentration tested (15.6...
- by Alfredo Maccioni and +1
- •
- Plant Biology, Biological Control, Essential Oil, Flora
Using essential oils (EOs) to suppress unwanted species at the seedling stage is a promising way to decrease the use of synthetic herbicides and thus protect native plant diversity. We verified the effects of rosemary (Salvia rosmarinus)... more
Using essential oils (EOs) to suppress unwanted species at the seedling stage is a promising way to decrease the use of synthetic herbicides and thus protect native plant diversity. We verified the effects of rosemary (Salvia rosmarinus) EOs at different concentrations on the growth and mortality of seedlings of the invasive alien species Acacia saligna derived from seeds collected at four wild populations in Sardinia and Sicily (Italy), by monitoring their survival, dry weight, shoot and root length during their early development. Six different spray solutions were applied to A. saligna seedlings: one with only distilled water; one with a solution of distilled water, ethanol and Tween 20; three with a rosemary EO concentration of 3.9, 7.8 and 15.6 mL/L; and one with the commercial herbicide DICOTEX© RTU. The seedling survival and growth decreased with the increase of EO concentrations; the patterns were similar for all populations. The highest rosemary EO concentration tested (15.6 mL/L) strongly inhibited shoot and root length, dry weight and survival of A. saligna seedlings and its effect was significantly different compared to the other EO and control treatments, except for the control with commercial herbicide, that was the more effective compared to all other treatments. Our results suggest that the rosemary EO concentration at 15.6 mL/L is a valid tool for the biological control of A. saligna. This treatment is promising because it could be applied primarily to reduce the seedlings' emergence/development and establishment while ensuring the conservation of native plant diversity and the preservation of the Mediterranean habitats.