Effect of temperature on the growth and acetylene reduction activity of Azolla pinnata from the Darwin region of northern Australia.
A. pinnata collected from Fogg Dam near Darwin was grown for 2 wk in a controlled environment of six, 12 h day/night temp. combinations ranging from 22/14 to 42/34 deg C. Fresh wt. of A. pinnata increased 14- to 16-fold over 14 days at 30/25, 38/30 and 40/32 deg . Acetylene reduction activity was highest (25-33 mu mol ethylene/g day) after 7 days growth at 30/22-25 deg but declined to 3-8 mu mol ethylene/g day at higher temp.