Aunque los pirules tienen efectos alelopáticos negativos sobre los cultivos, sus efectos sobre estas plantas nativas siguen siendo desconocidos. De hecho, la. vol número1 Alternancia de cultivos, su efecto sobre el suelo en zonas dedicadas a tabaco negro en · índice de autores · índice de materia búsqueda de . No Brasil, os estudos com alelopatia são, muitas vezes, restritos à influência de plantas cultivadas e invasoras sobre os cultivos, principalmente em manejo com .
|Published (Last):||10 March 2017|
|PDF File Size:||14.67 Mb|
|ePub File Size:||1.65 Mb|
|Price:||Free* [*Free Regsitration Required]|
An evaluation of techniques for measuring vesicular arbuscular mycorrhizal infection in roots. Thus, we assumed that seed germination had successfully occurred when the aerial shoots of seedlings were observed. The greenhouse experiments complemented the results of the in vitro bioassays, showing that soil collected beneath both peppertree genders also inhibit the germination of native species.
Alelopatía diferencial entre los géneros de un árbol invasor dioico sobre plantas de desierto
Acta Physiologiae Plantarum Restos vegetais e liteira podem interferir no desenvolvimento de plantas. In Ferocactus latispinus Figure 1B alelopatja Myrtillocactus geometrizans Figure 1Cthe concentrated and diluted extracts of staminate laelopatia also reduced germination rates in higher magnitudes than the other treatments. London, Academic Press, Therefore, the allelopathic effects of peppertrees on Mexican succulent plants remain unknown, as well as the differential effects that male and female trees may have on these species.
Plant organs of peppertrees were collected in April dry season by randomly selecting ten individuals of each gender in the field site. Conversely to that reported for these cactus species, germination rates of Mammillaria longimamma were more strongly reduced by the concentrated extracts of fruits and leaves of female peppertrees Figure 1D.
All plant extracts reduced mycorrhization and the number of spores of arbuscular mycorrhizal fungi on soybean, maize and common bean.
Nevertheless, the diluted extracts of these plant organs did not affect germination rates of Y. Several studies that cover medicinal plants were observed in the literature, but the evaluation of allelopathic potential is limited.
In this case, the seedlings of two cacti Echinocactus platyacanthus and Ferocactus latispinus and the two succulent monocots Agave salmiana and Yucca filifera displayed lower biomass on soils collected beneath male peppertrees than in the other soil types. Peruvian peppertrees produce several secondary metabolites that have been proven to reduce germination of crops, including flavonoids, oleoresins, tannins, terpenes and saponins Zahed et al.
Pairwise comparisons between seeds watered with peppertree extracts and control seeds indicated that this invasive species contains secondary metabolites that can inhibit the germination of succulent plants from the Chihuahuan Desert Figure 1.
This procedure concurs with those used by other authors that have assessed the allelopathic effects of peppertrees on crops Materechera and Hae, ; Borella et al. On the other hand, shoot emergence rates of Mammillaria longimamma did not differ between soils collected beneath male and female peppertrees, but these two soil types reduced shoot emergence rates as compared with the control soil Figure 2D.
The study added medicinal plants that possess potential secondary allelopathic compounds, with the possibility of being used in the production of natural herbicides. Nevertheless, the strong reduction of germination observed on soils collected beneath peppertrees, as well as the elevated concurrence of results between this experiment and the in vitro bioassays, allow suggesting that the secondary metabolites produced by this invasive tree are released to the environment and accumulated in the soil beneath their canopies.
For each species, these dishes were split into nine groups 5 dishes per group ; eight groups of dishes separately received 5 mL of the different aqueous extracts male flowers, fruits, and leaves of male and female trees at the two concentrations concentrated and diluted extractswhile the ninth group of dishes only received distilled water control group.
Services on Demand Journal. Thus, for each plant organ we obtained a concentrated extract equivalent to g of plant organs per liter of distilled water, and a diluted extract equivalent 50 g of plant organs per liter of distilled water. Differential allelopathy between genders of an invasive dioecious tree on desert plants.
Potential of aqueous extracts from parts of the pepper tree Schinus molle L.
Allelopathy as a factor in ecological process. In these bioassays, seeds of native species were watered with aqueous extracts obtained from staminate flowers and leaves produced by male individuals, and with aqueous extracts obtained from fruits and leaves produced by female trees.
Six succulent plant species were used to test the allelopathic effects of peppertrees. Nevertheless, seedling biomass of Myrtillocactus geometrizans and Mammillaria longimamma was similarly reduced on soils of both tree genders, hence suggesting that female trees can also prevent the development of some native species. In common bean, pine extract reduced hypocotyl and root length, contrasting to velvet bean and millet.
Alelopatia: el potencial de las plantas medicinales en el control de espécies espontáneas
Aqueous extracts alflopatia prepared within 24 h after collection of plant organs. Peppertrees were quickly incorporated into the Mexican culture because of their rapid growth to obtain raw materials and several ethnobotanical uses in traditional medicine Bye and Linares, ; Paredes-Flores et al. Alien plants usually colonize areas affected by human activities where native vegetation has been partially or completely removed Lozon and MacIsaac, ; Alston and Richardson, Additionally, these experiments indicated that male and female individuals may also have differential allelopathic effects on native species in the field.
This differential response of M. Nevertheless, the germination of this species was also inhibited by the other peppertree extracts, as compared to control seeds Figure 1D. This is an open-access article distributed under the terms of the Creative Commons Attribution License. Seeds were later stored in ventilated plastic flasks until their use in the experiments described below. On male trees we collected g of mature leaves and g of staminate flowers, while on female trees we collected g of mature leaves and g of mature fruits.
An integrative plant-fungal process.
Influencia de la alelopatía en los cultivos 
Abstract The Peruvian peppertree Schinus molle is a dioecious species from South America that was introduced into central Mexico five centuries ago. Allelopathic effects of parthenin against two weedy species Avena fatua and Bidens pilosa. Mycorrhizal links between plants: Biological invasion of a refuge habitat: Assim como neste trabalho, Correia ej al. This suggests that peppertrees could interfere with the establishment of native plants. Journal of the American Statistical Association We assigned 45 of culyivos to each native species and sowed 20 seeds of the respective species on these dishes.
Nonparametric estimation from incomplete observations. Shoot emergence rates of Echinocactus platyacanthus Figure 2AFerocactus latispinus Figure 2B and Myrtillocactus geometrizans Figure 2C were lower in the soil collected beneath male peppertrees, as compared to the other soil types. Thus, although washing may remove some secondary metabolites accumulated on the surface of plant organs, we preferred assessing cultivs allelopathic effects of secondary metabolites contained within plant organs to avoid biased effects of due to the presence alelopwtia external contaminants.
Frontiers in Ecology and the Environment 2: In this study we performed a series of laboratory and greenhouse experiments addressed to test these effects.
TOP Related Articles
- CALILA Y DIMNA RESUMEN PDF
- APLICACIONES DEL TEOREMA DE TORRICELLI PDF
- HISTERECTOMIA POR MIOMATOSIS UTERINA PDF
- ESTEREOTAXIA MAMA PDF
- ATE QUE A VIDA NOS SEPARE MONICA DE CASTRO PDF
- DIFERENCIA ENTRE CAPUT SUCCEDANEUM Y CEFALOHEMATOMA PDF
- FISIOPATOLOGIA DA HEPATOESPLENOMEGALIA PDF
- CONOCIMIENTO INUTIL REVEL PDF
- LEI 5172 ATUALIZADA PDF
- EQUOTERAPIA E SINDROME DE DOWN PDF