Carolyne Dürr

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Industrial glycerol obtained through the transesterification process using rapeseed oil did not support growth of several strains ofClostridium butyricum obtained from bacterial culture collections. Ten new strains ofC. butyricum were obtained from mud samples from a river, a stagnant pond, and a dry canal. These new isolates fermented the commercial(More)
BACKGROUND AND AIMS The framework provided by an emergence model was used: (1) for phenotyping germination and heterotrophic growth of Medicago truncatula in relation to two major environmental factors, temperature and water potential; and (2) to evaluate the extent of genetic differences in emergence-model parameters. METHODS Eight cultivars and natural(More)
Enhancing the knowledge on the genetic basis of germination and heterotrophic growth at extreme temperatures is of major importance for improving crop establishment. A quantitative trait loci (QTL) analysis was carried out at sub- and supra-optimal temperatures at these early stages in the model Legume Medicago truncatula. On the basis of an(More)
Laboratory and field experiments were carried out to quantify the effects of the size and roughness of aggregates placed in the seedling path of sugar beet, in order to help in decision making for soil tillage and sowing operations. Graded aggregates (10, 15, 20, 30, 40, 50, 60 and 70 mm longest axis) were either laid on the soil surface or included in the(More)
Hypocotyl growth is a key characteristic for plant emergence, influenced by environmental conditions, particularly temperature, and varying among genotypes. Cellular changes in Medicago truncatula hypocotyl were characterized to study the impact of the environment on heterotrophic growth and analyze differences between genotypes. The number and length of(More)
In coming decades, increasing temperatures are expected to impact crop yield and seed quality. To develop low input systems, the effects of temperature and sulfur (S) nutrition in oilseed rape, a high S demanding crop, need to be jointly considered. In this study, we investigated the effects of temperatures [High Temperature (HT), 33°C/day, 19°C/night vs.(More)
BACKGROUND AND AIMS Germination and heterotrophic growth are crucial steps for stand establishment. Numerical experiments based on the modelling of these early stages in relation to major environmental factors at sowing were used as a powerful tool to browse the effects of the genetic diversity of Medicago truncatula, one of the model legume species, under(More)
Soil crusting strongly affects seedling emergence. Laboratory experiments were carried out to analyse the emergence of sugar beet (Beta vulgarisL.) seedlings from beneath a crust, and to determine whether mechanical models using penetrometer measurements could predict the final emergence rates. Wet and dry crusts were created under a rainfall simulator. An(More)
Heterotrophic growth relies on remobilisation of seed reserves and mineral absorption. We used a compartmental model to investigate the fluxes of N absorption and remobilisation of N reserves in a legume seed with high protein content. Seedling growth was studied during the heterotrophic stage in two genotypes of Medicago truncatula as a function of N(More)