Effect of Aldrin on Growth and Oxidative Metabolism of Rhizobia

摘要

At 500 μg ml−1of aldrin,Rhizobiumsp. Bengal gram (Cicer arietinum) andRhizobiumsp. Green gram(Vigna radiata) showed a lag of about 12 h after which the growth returned to normal. The lag period was extended at concentrations above 500 μg ml−1of aldrin and it was more in the case ofRhizobiumsp. Green gram thanRhizobiumsp. Bengal gram. However, at high concentrations of aldrin, after the lag, the growth rate was very slow. On the seventh day,Rhizobiumsp. Bengal gram showed 72, 81 and 84° inhibition whileRhizobiumsp. Green gram exhibited 74, 85 and 88° inhibition of growth at 1000, 1500 and 2000 μg ml−1of aldrin, respectively. In general, oxidative activity of both of theRhizobiumspp. on pentoses, hexoses and TCA cycle intermediates was more strongly inhibited in aldrin grown cells than normal cells. The inhibitory effect of aldrin on the oxidative activity of rhizobia was partially released with a high concentration