Effect of acid rain on germination of wheat and rape

Wheat and rape seeds were treated with simulated acid rain at pH 2.0，2.5，3.0，3.5，4.0 and 5.0 levels for 7 days in order to understand the effects of acid rain on seed germination of various acid-fast plant.The germination test shows that the seed germinations are absolutely inhibited at pH 2.0 for wheat and rape.Wheat seeds germinate abnormally at pH 2.5.When pH values above 3.0，the germination percentage，germination energy，germination index，vigor index of wheat and rape seeds increase with decreased acidity levels.In contrast，the percentage of abnormal germination of wheat decreases.The water absorption rate，respiratory rate and storage reserve transformation rate of wheat and rape seeds also increase with increased pH values.The storage loss of wheat increases with increased pH values but that of rape decreases.Inhibition indexes of shoot and root length of wheat and rape seeds decrease with increased pH values.Wheat has stronger fastness than rape under acid rain stress.