Abstract
Sugar uptake by potato tuber discs was studied. Discs were used “fresh” or after a 24-h ageing period. It was shown that ageing increases (by 3 to 4 times) the rate of glucose and sucrose uptake. Sucrose uptake by fresh tissues was insensitive to the presence of glucose or fructose while a competitive effect was observed after ageing. This indicates the development of an invertase activity, which was inhibited by tris-buffer. Sucrose and glucose uptake by aged discs was dependent on cellular metabolism as shown by the sensitivity to low temperature and metabolic inhibitors (NaCN, DNP, CCCP). Involvement of thiol groups was demonstrated by the inhibition with NEM and PCMBS. Orthovanadate, which decreases phosphate uptake by 85 % (Poderet al. 1986) did not produce any effect on glucose and sucrose uptake by aged tissues. Fusicoccin produced only a slight stimulation (15 %). These results argue in favour of the involvement of specific ATPases in ion and sugar uptake. No involvement of a redox system was observed. ABA and BAP inhibited the uptake induced by ageing but had no effect on the endogenous sugar content. BAP would act by its effect on the amount of ATP while ABA would act at the membrane level. The results are discussed in relation to the mechanisms of transfer of glucosyl groups and to the transport of sucrose by the symplasmic pathway. Reçule
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Abbreviations
- ABA:
-
acide abscissique
- BAP:
-
benzylaminopurine
- CCCP:
-
cyanure de carbonyl-m-chlorophénylhydrazone
- CHM:
-
cycloheximide
- DCCD:
-
N,N’-dicyclohexyl-carbodiimide
- DES:
-
diéthylstilbestrol
- DNP:
-
2,4-dinitrophénol
- FC:
-
fusicoccine
- GA:
-
acide gibbérellique
- IAA:
-
acide β-indolylacétique
- MES:
-
acide 2(-N-morpholino)éthane-sulphonique
- NEM:
-
N-éthylmaléimide
- PCMBS:
-
acidep-chloromercuribenzénesulphonique
- Tris:
-
tris(hydroxyméthyl)aminométhane
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Penot, M., Hourmant, A. & Reddahi, A. Contribution à l’étude de làabsorption du saccharose par des tissus de tubercule de pomme de terre adulte (Solatium tuberosum L.) modalités et influence des phytohormones. Biol Plant 35, 365–380 (1993). https://doi.org/10.1007/BF02928512
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DOI: https://doi.org/10.1007/BF02928512