Abstract
Summary Imbibition initiated digestion of both lipid and protein reserves in the manketti nut, although the embryo remained dormant. Dormancy was overcome by treatment with ethylene or ethrel whereupon the testa burst and the radicle emerged. Ultrastructural studies on the embryonic axis revealed that ethylene stimulation brought about changes in the nucleus and the pattern of protein digestion. The levels of proteins, lipids, sugars and starch were also monitored biochemically and it appeared that lipid was channelled into carbohydrates to support embryonic growth. Protein digestion took place at a slower rate than lipid digestion. The mobilization of reserves was more rapid in the embryonic axis than in the endosperm and cotyledons and all were accelerated by ethylene and ethrel treatments.
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