Developmental changes of carbohydrates in cape gooseberry (Physalis peruviana L.) fruits in relation to the calyx and the leaves

Glucose, fructose, sucrose and starch were analyzed in fruits, calyx and the two next leaves during fruit development of cape gooseberry under glasshouse conditions in Berlin-Germany. Calyx was eliminated completely or half-sided vertically 5, 25 and 45 days past fruit set (PFS). Fruits growing completely without calyx slowed down their growth rates significantly from 10-15days PFS on. Fruits with half-sided calyx or with a complete removal of the calyx after 25 and 45 days grew unaffectedly. Higher increment rates of all carbohydrates were measured during the first 10-20 days of fruít development in fruits and calyx. Both organs showed higher sucrose concentrations as compared to the other carbohydrates and sucrose rose sharply from 20-30 days PFS in fruits and from 40-50 days in calyx. Glucose and fructose content rose in a lower scale than sucrose and both had verysimilar increase patterns in the fruit. Starch decreased in fruit and calyx from 10-20 days PFS until harvest (60 days) continuously. Leaf starch content was highest of the measured carbohydrates and followed a Gauss curve pattern type during fruit growth. Leaf sucrose decreased after 40 days PFS, probably due to an increased translocation to the fruit. 47.2 % of total dry matter in mature fruits were carbohydrates, whereas in calyx and leaves the percentages were 5.7 and 7.4 % respectively. Fruits with detached calyx 5 days PFS presented lower monosaccaride concentration during the inicial fruit growth and lower sucrose during the midseason of fruit development. From the analyzed carbohydrates starch was highest during all stages of fruit development in fruits growing completely without husk. It is supposed that the calyx plays a dominant role in both built up and translocation of carbohydrates, mainly sucrose. With its removal fruit development is delayed indicated by the increased starch contents during all development stages. Thus, calyx has not only a protective function but is also an important source for assimilates especially in the early growth stage of the fruit. The decrease in sucrose content of leaves from the midseason on of fruit development might be due to an increased translocation from the leaf to the fruit.

Bibliographic Details

Main Authors:	Fischer, Gerhard, Lüdders, Peter
Format:	Digital revista
Language:	spa
Published:	Universidad Nacional de Colombia - Sede Bogotá - Facultad de Ciencias Agrarias 1997
Online Access:	https://revistas.unal.edu.co/index.php/agrocol/article/view/21475
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