Influence of Elevated Shoot and Root Temperature on Nitrogen Fixation

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Abstract
Experiments were conducted to compare the effects on symbiotic N fixation (Rhizobium trifolii), of different temperature regimes imposed on the shoots and roots of subterranean clover. Constant high root temperature (30[degree]C) significantly increased the number of nodules per plant but reduced both the protein and total N content of plants not supplied with fertilizer N. By contrast, a constant high shoot temperature (30[degree]C) had no inhibitory effect on N fixation although plant yield was significantly reduced. Accumulation of a dark colored pigment and a reduction in the amount of pink colored tissue was observed in nodules from the roots of plants subjected to a constant temperature of 30[degree], 48 hours after this temperature was imposed.

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