نتایج جستجو برای: centaurea bruguierana

تعداد نتایج: 1433  

2013
Stephen L. Young Guy B. Kyser Jacob N. Barney Victor P. Claassen Joseph M. DiTomaso

In a 2-year field study, we quantified lateral root growth patterns and soil water depletion dynamics in the invasive annual Centaurea solstitialis and two native perennials, Elymus glaucus and Grindelia camporum. Centaurea solstitialis produced lateral roots most actively from early April to mid-June, during the late rosette to spiny seedhead stage while both root growth and water depletion we...

2006
A. M. Demers D. K. Berner P. A. Backman

Biological control of Canada thistle using Puccinia punctiformis has been largely unsuccessful in part due to a low incidence of systemically infected shoots and heterogeneous distribution of teliospores in the soil. The present study investigated the feasibility of strategic mowing to improve incidence of systemically infected shoots, and enhance intraand/or inter-season disease development in...

2013
Brandon S. Schamp Lonnie W. Aarssen Stephanie Wight

Competition is generally regarded as an important force in organizing the structure of vegetation, and evidence from several experimental studies of species mixtures suggests that larger mature plant size elicits a competitive advantage. However, these findings are at odds with the fact that large and small plant species generally coexist, and relatively smaller species are more common in virtu...

Journal: :Oncology reports 2008
Nahed El-Najjar Saadah Dakdouki Nadine Darwiche Marwan El-Sabban Najat A Saliba Hala Gali-Muhtasib

The antitumor activity of extracts of Centaurea ainetensis (C. ainetensis), a plant endemic to Lebanon, was investigated in human colon carcinoma cells. At concentrations that were non-cytotoxic to normal human intestinal epithelial cells, the crude extract inhibited the proliferation of a host of colon-derived cancer cells. The crude extract effect was then investigated in HCT-116 (p53+/+) cel...

2005
L ETTER Giles C. Thelen Jorge M. Vivanco Beth Newingham William Good Harsh P. Bais Peter Landres Anthony Caesar Ragan M. Callaway

Giles C. Thelen, Jorge M. Vivanco, Beth Newingham, William Good, Harsh P. Bais, Peter Landres, Anthony Caesar and Ragan M. Callaway* Abstract Exotic invasive plants are often subjected to attack from imported insects as a method of biological control. A fundamental, but rarely explicitly tested, assumption of biological control is that damaged plants are less fit and compete poorly. In contrast...

2009
Judith H. Myers Caroline Jackson Hillary Quinn Shannon R. White Jenny S. Cory

The biological control program for diffuse knapweed, Centaurea diffusa Lamarck, a Eurasian plant that has invaded large areas of grasslands in western North America, has gone on for over 35 years. This program involved the release of 12 biological control agents of which four are numerous and widely distributed; two species of Tephritid flies, Urophora affinis and Urophora quadrifasciata, the r...

2016
Jan‐Hendrik Dudenhöffer Gesine Pufal Christiane Roscher Alexandra‐Maria Klein

Janzen-Connell effects are negative effects on the survival of a plant's progeny at high conspecific densities or close to its conspecifics. Although the role of Janzen-Connell effects on the maintenance of plant diversity was frequently studied, only few studies targeted Janzen-Connell effects via postdispersal seed predation in temperate grassland systems. We examined effects of conspecific d...

Journal: :American journal of botany 2015
Yan Sun Heinz Müller-Schärer John L Maron Urs Schaffner

PREMISE OF THE STUDY Biotic resistance is often studied in the context of how interactions between native biota and invading species influence the success of those invaders. Seldom, however, is the strength of "resistance" compared biogeographically, where the ability of a species to impede invader establishment is contrasted between an invader's native and introduced recipient community. MET...

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