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 .

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New York, Chapmann and Culltivos, The only exception was Mammillaria longimammawhose germination rates were similarly inhibited by soils collected beneath both tree genders. 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.

Nevertheless, for these two cacti, extracts obtained from all other peppertree organs also led to lower germination rates than those estimated for control seeds Figure 1. Besides testing whether soils collected beneath peppertrees affect germination, the seedlings resulting from the greenhouse experiments were used to assess whether peppertrees affect the growth of succulent plants.

Nevertheless, it is important to highlight that the cactus Mammillaria longimamma displayed lower germination rates in those watering treatments where extracts from fruits and leaves of female trees were applied.

Brazilian Journal of Chemical Engineering Although it is important to recognize that these differential effects may be partially due to the influence of chemical cultvios that we were unable to measure, such as the osmotic potentials of the aqueous extracts, our results suggest that staminate flowers produced by male individuals would have the most remarkable inhibitory effects on the germination of these species.

Germination rates of Echinocactus platyacanthus were a,elopatia reduced by extracts of staminate flowers, and these inhibitory effects occurred irrespectively of the concentration of the aqueous extracts Figure 1A. Competitive abilities of introduced and native grasses.

In the case of A.

Influencia de la alelopatía en los cultivos [1998]

Biomass of Agave salmiana seedlings was lower on soils collected beneath peppertrees than in the control soil, but seedlings grown on soil collected beneath male individuals were smaller than those grown on alelopatiq collected beneath female trees Figure 3E. 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.


The two ccultivos monocots, Agave salmiana Figure 2D and Yucca filifera Figure 2Fdisplayed lower shoot emergence rates in soils collected alelopati male peppertrees.

Restos vegetais e liteira podem interferir no desenvolvimento de plantas. This differential production and accumulation of secondary alelopatiaa might explain why the inhibitory effects of staminate flowers were stronger than those other plant organs, including the fruits produced by female trees. The objective of this study was to eb the allelopathic effects of aqueous extracts of pine Pinus sp.

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. Management of mycorrhizas in agriculture, horticulture and forestry. We assigned 45 of dishes to each native species and sowed 20 seeds of the respective species on these dishes.

Thus, we assumed that seed germination had successfully occurred when the aerial shoots of seedlings were observed. This differential response of M. For this, we randomly selected five trees of each gender in the field site and collected 2 L of soil first 10 cm of the soil profile beneath their canopies.

Seedling emergence was monitored every three days during 60 days. Results Allelopathic potential of peppertrees. For this, parental plants of each alelolatia were randomly selected in the field site and we collected fruits on each of them.

We did it because contaminants from urban areas neighboring the field site might reach the peppertrees and accumulate on them, which in turn could interfere with the assessment of their allelopathic effects.

Exotic grass competition in suppressing native shrubland re-establishment. Allelopathic effect of Schinus molle essential oils on wheat germination. Forest Ecology and Management Therefore, a total of seeds of each species allopatia each watering treatment.

Santa Cruz do Sul, Neither water nor alelppatia extracts were added afterwards. The density of adult peppertrees in this site is The same procedure was used to collect fultivos soil in five open areas without vegetation cover, always maintaining a minimum distance of 20 m from the canopy of any peppertree.

Allelopathy and plant invasions: This could be the case of the Peruvian peppertree Schinus molle L. Potential of aqueous extracts from parts of the pepper tree Schinus molle L.

Influencia de la alelopatía en los cultivos

It is important to encourage this type of studies, for an ecological perspective in general, to enable the manipulation of allelopathic interactions related to agriculture. It is important to encourage this type of studies, for an ecological perspective in general, to enable the manipulation of allelopathic interactions related to agriculture Palabras clave: Fruits were carried to the laboratory and cleaned to release the seeds.


Shoot emergence rates and seedling biomass of all succulent species significantly differed among soil types results of statistical analyses in Table 1. These samples were rinsed with distilled water during 1 min to remove dust and any other particulate materials. However, as far as we are aware, these negative effects on crop germination have been only evaluated for fruits and leaves produced by female peppertrees Anaya and Gomez-Pompa, ; Materechera and Hae, ; Zahed et al.

Opposite to pine, extracts of velvet bean and millet reduced the hypocotyl and root length in soybean.

Alelopatia: el potencial de las plantas medicinales en el control de espécies espontáneas

To our best knowledge, this is the first study reporting such differential allelopathic effects between genders of a dioecious species and, in the particular case of the peppertrees, male individuals seem to have higher potential than female individuals for inhibiting the germination of succulent plants.

This tree has invaded abandoned agricultural fields from semiarid regions, where it can be found with several native succulent plants that have recolonized these areas. Samples belonging to the same soil type male trees, female trees and control soil were pooled and meshed to remove leaf litter and other coarse materials.

Several studies that cover medicinal plants were observed in the literature, but the evaluation of allelopathic potential is limited. The role of plants found in the Mexican markets and their importance in ethnobotanical studies. To test the allelopathic effects of these extracts we prepared plastic Petri dishes 50 mm diameter by 12 mm deep using sterile cotton pads as germination substrate. The dry biomass of seedlings obtained in the greenhouse experiments was firstly compared among soil types with one-way ANOVA.

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How to cite this article. Allelopathic effects of eucalyptus and the establishment of mixed stands of eucalyptus and native species.