Articles
CHANGES IN SUGAR CONTENTS AND ACTIVITIES OF SUGAR METABOLIZING ENZYMES IN PINEAPPLE FRUIT FLESH DURING DEVELOPMENT
Article number
529_23
Pages
191 – 198
Language
Abstract
The relationship between sugar content and the activity of sugar metabolising enzymes; sucrose synthase (SS), sucrose phosphate synthase (SPS), neutral invertase (NI), acid invertase (A1), and cell wall invertase (CWI), in pineapple fruit flesh during development was determined.
In the early stages of fruit development, glucose and fructose were the predominant sugars.
Sucrose began to accumulate rapidly 6 weeks before harvest, with more in the fruitlet than in the interfruitlet tissue.
The SS activity was high in young fruit, and declined to very low activity, while SPS remained low throughout fruit development.
The activities of three invertases were high in the young fruit and declined to very low level 6 weeks before harvest when sucrose began to accumulate.
CWI increased again 4 weeks before harvest, mainly in fruitlet, while the activities of NI and AI remained low.
There was a negative correlation between sucrose accumulation and the activities of SS, NI, and AI. The high CWI activity in the last 4 weeks of fruit development may be responsible for maintaining a pressure gradient between sink and source and assist in sucrose accumulation.
In the early stages of fruit development, glucose and fructose were the predominant sugars.
Sucrose began to accumulate rapidly 6 weeks before harvest, with more in the fruitlet than in the interfruitlet tissue.
The SS activity was high in young fruit, and declined to very low activity, while SPS remained low throughout fruit development.
The activities of three invertases were high in the young fruit and declined to very low level 6 weeks before harvest when sucrose began to accumulate.
CWI increased again 4 weeks before harvest, mainly in fruitlet, while the activities of NI and AI remained low.
There was a negative correlation between sucrose accumulation and the activities of SS, NI, and AI. The high CWI activity in the last 4 weeks of fruit development may be responsible for maintaining a pressure gradient between sink and source and assist in sucrose accumulation.
Publication
Authors
C. Chen, Robert E. Paull
Keywords
sugar, metabolism, flesh development
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