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Molecular characterization of atrazine resistance in common ragweed [Ambrosia artemisiifolia L.]

100%

Cseh A., Cernak I., Taller J.

Journal of Applied Genetics

2009

tom 50

nr 4

321-327

Common ragweed (Ambrosia artemisiifolia L.) is the most frequent weed in the Carpathian Basin and is spreading fast in other parts of Europe. In recent years, besides the wild type, a mutant genotype resistant to atrazine herbicides has evolved and is now widespread in many areas. The present study demonstrates that the atrazine resistance of ragweed is maternally inherited, and is caused by a point mutation in the psbA chloroplast gene. The promoter 5'-untranslated region and the open reading frame regions of the gene were analysed, and a homology search was performed. Both the atrazine-resistant and susceptible types of cpDNA were present in atrazine-resistant plants, while the mixed presence of both genotypes in the same plant, known as heteroplasmy, was not unequivocally detectable in susceptible plants.

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Estimation of pollen and seed production of common ragweed in France

84%

Fumanal B., Chauvel B., Bretagnolle F.

Annals of Agricultural and Environmental Medicine

2007

tom 14

nr 2

Common ragweed (Ambrosia artemisiifolia L.) is an invasive weed of fi eld crops and human-disturbed habitats in Europe. As well as in its natural range (North America), common ragweed is a threat to human health due to its abundant allergenic pollen release. Most studies have been focused on airborne pollen monitoring, but to date, no data have been available on precise individual plant pollen and seed production related to plant traits growing in natural environment and on their corresponding source of variation. The aim of this study was to evaluate pollen and seed production of common ragweed plants in several populations in France. Seasonal pollen production per plant ranged from 100 million to 3 billion and seed production from 346 to 6,114, depending on plant size and habitat. Common ragweed plants developing in fi eld crops produced more pollens and seeds than those growing in other habitats. Pollen and seed production was closely related to plant volume and biomass, thus providing a means of estimating potential pollen and seed production in given target areas. Such biological data could be integrated into population management strategies or into airborne pollen modelling.

Ograniczanie wyników

1 Annals of Agricultural and Environmental Medicine

1 Journal of Applied Genetics

1 Bretagnolle F.

1 Cernak I.

1 Chauvel B.

1 Cseh A.

1 Fumanal B.

1 Taller J.

1 2009

1 2007

Wyniki wyszukiwania

Molecular characterization of atrazine resistance in common ragweed [Ambrosia artemisiifolia L.]

Estimation of pollen and seed production of common ragweed in France