Resistenzverhalten von Buschbohnen -Phaseolus vulgaris- gegenüber Bromchlordifluormethan -Halon 1211-

The present investigation deals with the effects of the gaseous halon 1211 (difluoro-chlorobromo-methane) on beans (Phaseolus vulgaris). The plants were exposed to a concentration of 10 ppb over a period of 45 days. The exposure was followed by a distinct increase of the activity of the glutathione-s-transferases, whereas the protein contents in the exposed plants decreased. For the pigment contents no significant differences were observed between exposed beans and control plants. The lutein contents of the exposed beans were however significantly higher. The exposure to the halogenated methane was followed by increasing transpiration and increasing net-photosynthesis rate. For the control plants, however, lower transpiration coefficients were calculated.