The effects of drought stress on respiration of isolated corn mitochondria.
Mitochondria were isolated from etiolated corn shoots (Zea mays L.) that were stressed to a measured water potential. The rates of mitochondrial respiration in state III, state IV, and without phosphate or ADP on a milligram protein basis decreased as water stress increased with succinate, malatepyruvate, or reduced nicotinamide adenine dinucleotide as substrates. Coupling (as determined by respiratory control and ADP/O ratios) did not decrease with increasing water stress. At water potentials greater than -35 bars all respiration had ceased.
Bell
D T
DT
Department of Agronomy, University of Illinois, Urbana, Illinois 61801.
Koeppe
D E
DE
Miller
R J
RJ