Photoassimilates needed for fruit development are supplied from leaves, converted in fruit to substances relating
to the specific quality of the fruit, then accumulate in the fruit. There are various regulation steps in the process
from photoassimilate synthesis in leaves to sugar accumulation in fruit: photosynthesis, synthesis of translocation
sugars, loading of translocation sugars, their translocation, their unloading, their membrane transport, their
metabolic conversion, and compartmentation in vacuoles. Thus, it is important to clarify the mechanism and
regulation of each step in fruit development. In this review, mainly the metabolic conversion of translocation
sugars and their regulation at the genetic level in fruit are described because the metabolic conversion in fruit
contributes greatly to produce the sink activity needed for fruit development.
Photoassimilates needed for fruit development are supplied from leaves, converted in fruit to substances relatingto the specific quality of the fruit, then accumulate in the fruit. There are various regulation steps in the processfrom photoassimilate synthesis in leaves to sugar accumulation in fruit: photosynthesis, synthesis of translocationsugars, loading of translocation sugars, their translocation, their unloading, their membrane transport, theirmetabolic conversion, and compartmentation in vacuoles. Thus, it is important to clarify the mechanism andregulation of each step in fruit development. In this review, mainly the metabolic conversion of translocationsugars and their regulation at the genetic level in fruit are described because the metabolic conversion in fruitcontributes greatly to produce the sink activity needed for fruit development.
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