Fig. 2. Adaptive rearrangements of plant mitochondrial ultrastructure under anaerobic stress. A, Elongated mitochondria after 24 h anaerobic incubation of detached root of Cucurbita pepo in the presence of exogenous glucose (3 %). B, Mitochondria of rice coleoptile developing stacks of parallel cristae with a dense matrix after 5 d anaerobic incubation. C, Mitochondria taking the form of mitochondrial reticulum after 72 h anaerobic incubation of detached root of C. pepo in the presence of exogenous glucose (3 %). D, Dumb‐bell shaped mitochondria in detached coleoptile of O. sativa after 48 h anaerobic incubation in the presence of exogenous KNO₃ (10 mm). m, Mitochondrion. Bars = 0·5 µm.