scholarly journals Promotion of Growth and Invertase Activity by Gibberellic Acid in Developing Avena Internodes

1968 ◽  
Vol 43 (1) ◽  
pp. 29-34 ◽  
Author(s):  
Peter B. Kaufman ◽  
Najati Ghosheh ◽  
Hiroshi Ikuma
Keyword(s):  
Gibberellic Acid ◽  
Invertase Activity

Regulation of invertase activity and growth in rice (Oryza) coleoptile sections by gibberellic acid and sucrose

1972 ◽  
Vol 50 (6) ◽  
pp. 1185-1190 ◽  
Author(s):  
Sarvjit L. Soni ◽  
Peter B. Kaufman
Keyword(s):  
Growth Rate ◽  
Enzyme Activity ◽  
Gibberellic Acid ◽  
State Level ◽  
Close Correlation ◽  
Invertase Activity ◽  
Maximal Growth ◽  
Steady State Level ◽  
Maximal Growth Rate ◽  
Rice Coleoptile

Changes in invertase activity and growth were examined in excised rice coleoptile sections which were treated with water, gibberellic acid (GA3), sucrose, and GA3 + sucrose. Invertase activity with all treatments rises in parallel during the first 6 h. Between 6 and 12 h, the GA3 and GA3 + sucrose treatment causes the invertase activity to increase at a faster rate than the respective water and sucrose controls. For all treatments, the peak invertase activity occurs at 12 h; it then declines rapidly between 12 and 24 h. After this, the enzyme activity becomes stable by 36 h for sucrose and GA3 + sucrose treatments. In contrast, in water and GA3 treatments, the enzyme activity continues to decrease up to 48 h, then attains a steady state level. With water, GA3, sucrose, and GA3 + sucrose, there is a close correlation between the time of maximal invertase activity and the time of maximal growth rate (12 h), and the kinetics for promotion of both processes are essentially the same. This study indicates that both GA3 and sucrose may be involved in regulating levels of invertase and that invertase activity is closely associated with growth in rice coleoptile sections.

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