Add time:09/06/2019         Source:sciencedirect.com

Mitochondria from iris (Iris hollandica cv. Ideal) bulbs (circumference 7–8 cm) that have been treated with ethylene to evoke early flowering show an induction of alternative respiratory capacity and a rise in state 3 respiration. Mitochondria from untreated control bulbs have no alternative respiration and these bulbs produce few early flowering plants. A pretreatment with a competitive inhibitor of ethylene, 2,5-norbornadiene (NBD), inhibits ethylene effects on respiration. Effects of application of 100 ppm ethylene on respiration are not completely counteracted by 4000 ppm NBD, even after a 5-day pretreatment with NBD, but effects of application of 10 ppm ethylene are inhibited by 8000 ppm NBD after a 3-day NBD-pretreatment. The flowering percentage of 10 ppm ethylene-treated bulbs is 100%, while after a NBD treatment less than 10% of the bulbs produced flowering plants. NBD by itself did not influence the alternative pathway in mitochondria appears to be dependent on the kind of respiratory substrate used: a high capacity is found with pyruvate, a low capacity with NADH, while with succinate intermediate values are observed. The capacity of the alternative respiration is not directly correlated with state 3 respiratory activity.

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