Abstract
Rates of respiration and extension of pea fruits maintained under different regimes of fruit (10 °C to 25 °C) and plant (15 °C to 30 °C) temperature were measured during prolonged darkness. Higher fruit temperatures resulted in faster maximum rates while higher plant temperatures were associated with slower maximum rates of fruit extension and respiration. Increasing the temperature of either part caused faster decay of rates in the dark; this effect being more apparent for respiration than for growth in length and for plant temperatures than for fruit temperatures. The relationship between maximum rates of growth and respiration for different temperatures was linear. There was an asymptotic curvilinear relationship between specific respiration and relative extension rates obtained during prolonged darkness. Analysis of these data using an exponential equation of the form showed that treatment regimes affected primarily the asymptote (A) of this equation. Estimates of the shape parameters (b and k) of the curve were very variable and no obvious treatment effects could be discerned. The form of these data is compared with those of other models for respiration.
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