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- W2025621072 abstract "Test tube grown Parasponia plants formed nodules on the surface of the agar and reduced acetylene at a constant rate for a mimimun of 5.5 h at 25°C. Nitrogenase activity increased with pC2H2 to maximum activity at levels higher than 0.1 atm. No diurnal rhythm, attributable to the supply of photosynthate, was detected and decapitation of the plant had no effect on nitrogenase activity although nodule detachment lowered activity by 32 % with fürther diminution when nodules were sliced. Nitrogenase activity decreased from the tip to the base of the nodule. Soaking for 30 min did not affect activity. Repeated acetylene reduction assays made on plants adversely affected their activity. Maximum activity occurred at 25° to 35 °C. Below 20 °C nitrogenase activity ceased within minutes. Unlike that in legumes, acetylene reduction recovered slowly when plants were returned to favourable temperatures. Activity was lowered by 50% at 40 °C and to zero at 45 °C. The pO2 optimum for nitrogenase activity, in contrast to that in legume and many non-legume nodules, was narrow and activity fell rapidly above and below 0.2 atm O2. Restoration of nitrogenase activity after inhibition by 0.4 and 0.9 atm pO2 was slow." @default.
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- W2025621072 date "1980-09-01" @default.
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- W2025621072 title "EFFECTS OF OXYGEN, TEMPERATURE AND OTHER FACTORS ON THE REDUCTION OF ACETYLENE BY ROOT NODULES FORMED BY RHIZOBIUM ON PARASPONIA ANDERSONII PLANCH" @default.
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- W2025621072 doi "https://doi.org/10.1111/j.1469-8137.1980.tb00776.x" @default.
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