abstract increased knowledge of russian knapweed biology would facilitate development of an optimum control program. to examine germination characteristic of this weed, several experiments were conducted in weed research department, plant pest and diseases research institute of tehran during 2003. first experiment was a factorial with 3 replications to break seed dormancy of this weed. first fa...

Dormancy is a form of developmental arrest and is an adaptive trait that promotes the survival of many organisms. In flowering plants, dormancy occurs in seeds and vegetative propagules (Lang 1996). Seed dormancy increases the distribution of germination over time, thus enhancing the survival of plants in an ever-changing environment. Seed dormancy is of intrinsic interest to weed scientists be...

Real-time polymerase chain reaction (real-time PCR), also known as quantitative PCR, is used to determine relative gene expression or to quantify exact levels of mRNA in cells or tissues. Before the advent of real-time PCR, the major difficulty associated with traditional quantitative or semiquantitative PCR was to ensure that PCR reactions were quantified within the exponential phase of amplif...

Ever-increasing demand for water to irrigate crops, support aquaculture, provide domestic water needs and to protect natural aquatic and riparian habitats has necessitated research to reduce impacts from a parallel increase in invasive aquatic weeds. This paper reviews the past 4-5 years of research by USDA-ARS covering such areas as weed biology, ecology, physiology and management strategies, ...

In memory of Dr. Miklós Ujvárosi (1913-1981), founding teacher the scientific school Hungarian weed biology and control specialists on occasion 40th anniversary his death: This is unique preparing herbologists to have necessary knowledge. His students continue develop activity professor. The need for meetings has grown into a series regular wherever they work.

1 Department of Plant Biology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA 2 Present address: Department of Biological Sciences, SUNY Albany, Albany, NY 12222, USA 3 Department of Crop Sciences, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA 4 Department of Plant Pathology, Physiology, and Weed Science, Virginia Tech, Blacksburg, VA 24061, USA Update TRE...

EFFECTS OF SOIL SALINITY IN THE GROWTH OF AMBROSIA ARTEMISIIFOLIA BIOTYPES COLLECTED FROM ROADSIDE AND AGRICULTURAL FIELD Seok Hyun Eom a , Antonio DiTommaso b & Leslie A. Weston c a Department of Horticultural Biotechnology , Kyung Hee University , Yongin , Republic of Korea b Department of Crop and Soil Sciences , Cornell University , Ithaca , New York , USA c Plant Biology and Weed Science, ...