Abstract
Apple embryo dormancy could be easily removed not only when fruit were maintained at cold temperature but also when naked embryos were placed on a high osmotic pressure solution (mannitol). Isolated axes and cotyledons of such non-dormant embryos exhibited the ability to increase their non-adenylic triphosphate pool (NTP) when they were incubated with adenosine. This ability did not appear in embryos excised at fruit harvest time when they were dormant or when a secondary dormancy had been induced. Thus, a peculiar regulation of the non-adenylic triphosphate pool appeared in non-dormant embryos as was previously demonstrated in non-dormant tubers and buds. Guanylic pool participation to this regulation and the importance of correlations between the different organs of apple embryo are discussed.
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