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Plant and Cell Physiology, 1984, Vol. 25, No. 6 999-1007
© 1984

Article

Suppression by Exogenous Phospholipid of Cyanide-Insensitive Respiration of Submitochondrial Particles from Sweet Potato Root Tissue

Masayoshi Maeshima, He-sheng Li and Tadashi Asahi

Laboratory of Biochemistry, Faculty of Agriculture, Nagoya University Chikusa, Nagoya 464, Japan

Submitochondrial particles from sweet potato root tissue retained the respiratory characteristics of the intact mitochondria with respect to the sensitivity to cyanide and salicylhydroxamic acid. The activities of total, cyanide-insensitive, and salicylhydroxamate-sensitive respiration of the submitochondrial particles yielded from a definite weight of tissue slices incubated under aerobic conditions, particularly in ethylenecontaining air, were higher than those from the same weight of intact tissue. The less phospholipid the submitochondrial particles contained relative to protein, the higher the activities of cyanide-insensitive and salicylhydroxamate-sensitive respiration tended to be relative to total respiratory activity. When the submitochondrial particles were incubated with phospholipid liposomes, the activities of cyanide-insensitive and salicylhydroxamate-sensitive, but not cyanide-sensitive, respiration became extremely low. All phospholipids showed this effect. Such incubation of the submitochondrial particles with phospholipid liposomes yielded lighter particles, indicating close association of exogenously added phospholipid with the particles. Phospholipid molecules seemed to enter the membrane of the particles. We propose that phospholipid deficiency in the mitochondrial inner membrane facilitates operation of the cyanide-insensitive electron transport path.

(Received March 30, 1984; Accepted June 15, 1984)
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