Plant Physiology 93:89-97 (1990)
© 1990 American Society of Plant Biologists
Development and Growth Regulation
Changes in the Endosperm Cell Walls of Two Datura Species before Radicle Protrusion
R. A. Sánchez1,
Leslie Sunell,
John M. Labavitch and
Bruce A. Bonner
Department of Botany, University of California, Davis, California 95616,
Department of Pomology, University of California, Davis, California 95616
The possibility of an association between changes in cell walls of the micropylar portion of the endosperm and the induction of germination was explored in seeds of Datura ferox and Datura stramonium. The structure of the inner surface of the endosperm was studied by scanning electron microscopy and the composition of cell wall polysaccharides analyzed by gas chromatography and gas chromatography-mass spectrometry. Both scanning electron microscope images and chemical analysis showed changes in the micropylar portion of the endosperm in induced seeds before radicle protrusion. The inner surface of the endosperm appeared eroded, and in some areas, wall material seemed to be missing. The content of the main component of the cell wall polysaccharides, containing predominantly 4-linked mannose, decreased well before the emergence of the radicle through the endosperm. We propose that the degradation of a mannan type polysaccharide is an important factor in the reduction in mechanical strength of the endosperm, thus facilitating germination.
1 Present address: Depto de Ecologia, Fac.de Agronomía, U.de Buenos Aires. Avda. San Martin 4453, 1417 Buenos Aires, Argentina.
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