 Background and aims: Most of the economically relevant parasitic weeds of the Orobanchaceae have a more or less broad host spectrum within the plant family they are adapted to. The hostreleased compounds inducing their germination were identified as so-called strigolactones and represent four-ring terpenoids derived from the carotenoid metabolism. O. cumana, a fast emerging problem of sunflow...

New species may arise via hybridization and without a change in ploidy. This process, termed homoploid hybrid speciation, is theoretically difficult because it requires the development of reproductive barriers in sympatry or parapatry. Theory suggests that isolation may arise through rapid karyotypic evolution and/or ecological divergence of hybrid neospecies. Here, we investigate the role of k...

In the sunflower, which is an important oilseed and confection plant (Helianthus annuus L.), a study was conducted in 2013-2014 Ankara province order to determine distribution density of Homoeosoma nebulellum (Den. & Schiff.) causes lost terms quality quantity. The data were obtained from surveys Ayaş, Bala, Beypazarı Kalecik districts where sunflower found intensively. same period, adult f...

Vegetal materials were one of the first construction materials used by humans, but the development of petrol-based synthetic materials in the last century replaced them in mainstream construction techniques. However, since environmental impact and resource depletion are increasingly becoming a central issue, vegetal materials are revisited. Natural thermal insulations are mainly developed from ...

Oxalate oxidase (OXO) converts oxalic acid (OA) and O(2) to CO(2) and hydrogen peroxide (H(2)O(2)), and acts as a source of H(2)O(2) in certain plant-pathogen interactions. To determine if the H(2)O(2) produced by OXO can function as a messenger for activation of defense genes and if OXO can confer resistance against an OA-producing pathogen, we analyzed transgenic sunflower (Helianthus annuus ...

4th International Workshop on Functional-Structural Plant Models, 7-11 june 2004 –Montpellier, France Edited by C. Godin et al., pp. 164-168 Coupling ecophysiological and 3D architectural models of Helianthus annuus L. to analyse and simulate development and vegetative growth with fluctuating temperature and incident radiation Hervé Rey, Jean Dauzat, Jean-François Barczi, François Tardieu, Jéré...

Intact chloroplasts of spinach (Spinacia oleracea L.), sunflower (Helianthus annuus L.), and maize (Zea mays L.) mesophyll cells contained 0.33, 0.50, and 0.14% of bound hexosamine on a protein basis, respectively. Undifferentiated maize chloroplasts contained 0.19%. Values for chloroplast lamellae were, respectively, 0.16, 0.18, 0.12, and 0.06% and for envelope membranes they were 1.6, 2.5, 3....

The expression and activity of glutamine synthetase (GS, EC 6.3.1.2) were examined in relation to the rate of CO2 assimilation in sun ̄ower (Helianthus annuus L.) leaves. Intact plants were kept in the dark for 72 h and subsequently exposed to light under different atmospheric CO2 concentrations (100, 400 and 1200 ml l) for 6 h. The in vivo rates of net CO2 assimilation correlated with atmospher...