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Studies on the transportation and degradation of assimilates at the initial development of fruits in melon cucumis melo l

Studies on the transportation and degradation of assimilates at the initial development of fruits in melon cucumis melo l

Research Reports of the Rural Development Administration (Suweon) 33(2 HORTIC): 8-15

For the effective control of fruit set, it is important to understand the physiological metabolism of the initial development of fruit. These studies on the translocation of assimilates into the young fruits of 'Prince' melon (C. melo L.) pollinated or treated with 6-Benzylaminopurine(BA), were carried out to investigate the relationship between sugar metabolism and sink activity. Sugars in the phloem exudate of peduncle was mainly composed with poly-or disaccharides by more than 70 percent, and totaled to 1.7mg/ml. The transportation of 14C-assimilates into the 2-day old fruits pollinated was higher by about 5 times than that into the nonpollinated fruits at 6 hours after 14C-CO2 fixation, and then followed increasing much more at 12 hours. But sink activity arisen from the BA treated fruits at 3 hours was not continually increased. 14C-assimilates imported into the 4-day-old pollinated fruits was about 100 times more than these into the nonpollinated or BA treated fruits. Transported 14C-sugars were rapidly hydrolysed into hexoses in the 2-day-old pollinated fruits but not changed in the nonpollinated fruits at 6 hours or 12 hours after 14CO2 fixation. And the BA-treated fruits showed high sink activities at first, but oligo- and di- saccharides in the fruits were not changed significantly to hexoses. These results suggested that the initial development of fruit may follow the process of sink activities more or less, and they are hydrolysed into hexoses.

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