in a completely randomized design, the effect of the extract from trifolium alexandrium (0, 0.2 and 0.4%) on the germination, some morphological characteristics, photosynthetic pigments, and nutrients uptake of prosopis cineraria was evaluated. the highest germination rate and percentage (9.16 and 21%, respectively) were recorded in the 0.2% treatment. the maximum and minimum lengths of radicle...

Oak regeneration in temperate forests often fails the presence of understorey grass. Competition by resource exploitation between plants has been extensively studied. By contrast, competition interference, especially chemical interference (allelopathy), much less thoroughly examined and its relative importance remains unclear. We investigated influence allelopathic interaction on plant performa...

Allelopathy is the stimulatory or inhibitory effect of one plant on another by release phytochemicals. It can affect competitive interactions between plants, but strength may depend tissue donor and phylogenetic relatedness interacting species. Here, we examined allelopathic effects invasive garden lupine Lupinus polyphyllus Lindl. (Fabaceae) six native herbs from three families (Asteraceae, Ca...

Infestations by the weedy perennial plant Lantana camara L. (lantana) cause major disruptions to biodiversity; however, the effects of lantana on soil fungal communities are poorly understood, yet may interrupt important mutualisms in natural and semi-natural ecosystems. This research is aimed at understanding the impacts of lantana on the soil fungal community of five sites on contrasting soil...

Studies have identified the phytotoxicity of many native species of the Cerrado; however, most of them were conducted either in inert substrates, or using exaggerate proportions of plant material. We investigated the phytotoxicity of pequi leaves added to substrate soil in quantities compatible with the litter produced by this species. Pequi leaves were triturated and added to red latosol in co...

Allelopathy, one type of direct plant competition, can be a potent mechanism through which plant communities are structured. The aim of this study was to determine whether allelopathic interactions occur between the opportunistic green tide-forming species Ulva prolifera and the native macroalga Gracilaria lichvoides, both of which were collected from the coastline of East China sea. In laborat...

Cylindrospermopsin (CYN) is a toxic secondary metabolite produced by filamentous cyanobacteria which could work as an allelopathic substance, although its ecological role in cyanobacterial-algal assemblages is mostly unclear. The competition between the CYN-producing cyanobacterium Chrysosporum (Aphanizomenon) ovalisporum, and the benthic green alga Chlorococcum sp. was investigated in mixed cu...

Interactions between vascular plants and bryophytes determine plant community composition in many ecosystems. Yet, little is known about the importance of interspecific differences between bryophytes with respect to their effects on vascular plants. We compared the extent to which species-specific bryophyte effects on vascular plant generative recruitment depend on the following underlying mech...

Assistant Professor of Biology Whittier College, Whittier, California 90608,USA; and Assistant Professor of Biology, Occidental College, Los Angeles, California 90041 Abstract: The herbaceous flora of the chaparral includes annual and perennial species which differ in their temporal relationship to fire. Germination cues for these herb groups could be expected to reflect these temporal differen...