Planta177(1989),185–197. Abstract: plastid phosphoglucomutase-deficient seedlings; light/electron microscopy, inverted seedlings and clinostat assay; 5-minute 1g induction gives approximately10 versus14degrees root curvature. PubMed collective-author display is malformed; the named originating byline is T.Caspar and B.G.Pickard.