ABSTRACT The involvement of ethylene in zygotic embryogenesis is a little known aspect of the growth and development in higher plants. The scant data available to date do not appear to indicate that ethylene is involved directly in formation of seeds. Perhaps a relationship between ethylene and abscisic acid (ABA) exist to control this phase of such importance to development in plants. By other hand, the role of ethylene in germination of some seeds appear evident. However, in another remains controversial. Some authors hold that gas production is a consequence of the germination process, while others contend that ethyleneproduction is a requirement for germination. In this up to date we revise the characteristics of ACC-oxidase, the last enzymatic activity of ethylene byosinthesis in higher plants, in zygotic embryogenesis and germination of seeds under chemical, molecular and physiological aspects.
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