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ENERGY METABOLISM OF IMBIBING KALANCHOË SEEDS. RESPONSE TO GIBBERELLIC ACID AND CONTRIBUTION OF RESPIRATION AND FERMENTATION TO ATP PRODUCTION

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In Kalanchoë blossfeldiana seeds imbibed in the dark for 10 days at 20°C, very similar energy charge (EC) values were measured in the presence and absence of gibberellic acid (GA3). This demonstrates that GA3 does not prevent or strongly delay the induction of secondary dormancy in Kalanchoë seeds by elevating EC levels. However, GA3 clearly increased the ATP and AMP content of the seeds. During the first hours of anoxic imbibition, the sodium-fluoride sensitive ATP production still represents 25 to 30% of the ATP amount produced in the air, indicating that in Kalanchoë seeds the fermentative pathway can partly contribute to ATP production. As the oxygen uptake by the seeds is cyanide-sensitive and a severe inhibition of the increase in ATP content by cyanide can be demonstrated during the first hours of aerobic imbibition, our results indicate the participation of the normal cytochromic pathway in ATP synthesis.

Affiliations: 1: Laboratory of Plant Physiology, State University of Gent ; 2: Department of Biology, University of Antwerpen

10.1080/0021213X.1990.10677158
/content/journals/10.1080/0021213x.1990.10677158
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/content/journals/10.1080/0021213x.1990.10677158
1990-05-13
2018-06-19

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