Dormancy in vegetative buds of peach: relation between carbohydrate absorption potentials and carbohydrate concentration in the bud during dormancy and its release
C. Marquat et al., Dormancy in vegetative buds of peach: relation between carbohydrate absorption potentials and carbohydrate concentration in the bud during dormancy and its release, SCI HORT A, 79(3-4), 1999, pp. 151-162
The absorption of sucrose and sorbitol by the bud and the stem of Prunus pe
rsica was evaluated during the rest period. The utilization of p-chloromerc
uribenzenesulfonic acid (PCMBS), an inhibitor of sucrose transporter, allow
ed estimation of the active absorption of sucrose in different isolated org
ans (bud, bud's underlying tissues and stem). It was assumed that the sink
capacities of tissues depended on their potential to absorb carbohydrates b
y active transport. Endogenous carbohydrate levels in the tissues were also
measured. In the bud, the qualitative and quantitative distribution of car
bohydrates could be related to the absorption potential of the bud. During
dormancy, the bud exhibited a low absorption potential and increased its su
crose concentration by starch hydrolysis. Soluble sugars accumulated during
winter. During dormancy release, the bud was able to absorb carbohydrates
allowing carbon storage. The data presented led to the proposal of a scheme
of events occurring during bud dormancy and its release. (C) 1999 Elsevier
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