บทคัดย่องานวิจัย

หมวดหมู่ : ฐานข้อมูลงานวิจัย

Relationships between ethylene and carbohydrate metabolism in peach fruit.

Nonis A., Ruperti B., Casatta E., Vizzotto G.

5th International Postharvest Symposium . Volume of Abstract . Verona, Italy 6-11 June 2004. page 9

2004

บทคัดย่อ

Relationships between ethylene and carbohydrate metabolism in peach fruit.  It is generally accepted that sucrose is the major carbohydrate used in assimilate partitioning, its utilization in terminal sinks being dependent o­n cleavage into fructose and glucose.In plants this reaction is catalyzed by two enzymes with different properties; invertase and sucrose synthase.The relative importance of each may vary between species, in relation to tissue and organ development, and plays an important role in determining sink strength.

During the final phases of growth, peach fruit accumulates high level of sucrose, and this is accompanied by changes in the expression pattern of genes encoding proteins involved in sucrose metabolism and transport.

It has been pointed out that cross-talk between sugars and hormones signal transduction pathways may be involved in the coordination of metabolic activity in the fruit, and, therefore, in assimilate partitioning and allocation in sink tissue.In order to verify this possibility, peach fruits were treated during the final phases of growth with substances able to interfere with ethylene metabolism and action.Particularly, an inhibitor of ethylene biosynthesis (AVG) and an ethylene releasing molecule (CEPA) were adopted to impair the hormone’s action, and to verify the possible consequences o­n enzymes of sugar metabolism and fruit quality.In fact, despite the huge amount of research o­n the relationships between ripening and ethylene, little is known about the possible regulation exerted by the hormone o­n assimilate accumulation.

Data allowed the hypothesis of a role played by ethylene, at least during the last phases of fruit growth, in the regulation of the expression of genes related to sugar metabolism.The regulatory mechanisms seem to be related to a shift in the ripening process.