| Autor: |
Paul H. Moore, Andrew Maretzki, Amy S. Dela Cruz, Ling Yuan Su |
| Rok vydání: |
1992 |
| Předmět: |
|
| Zdroj: |
Journal of Plant Physiology. 140:168-173 |
| ISSN: |
0176-1617 |
| DOI: |
10.1016/s0176-1617(11)80929-6 |
| Popis: |
Summary Glyphosate is used as a ripener in Hawaii's sugar industry to increase sucrose yield. The compound increased sucrose accumulation in the 5th internode of 4-month-old plants as early as 5 d after application. Enzyme activities involved in sucrose metabolism — such as sucrose phosphate synthase (SPS), sucrose synthase (SS), acid invertase, and neutral invertase — were measured. Glyphosate significantly reduced the activity of acid invertase but not of the other enzymes. Decapitation by removal of the shoot apex did not stimulate sucrose accumulation in 5 d. However, sucrose content in the glyphosate plus decapitation treatment increased fivefold over that of the control and reached 50 % of that in glyphosate-treated stalks. Both decapitation and decapitation with glyphosate treatments reduced acid invertase activity to levels similar to those found in plants receiving glyphosate treatment alone. Dry mass in glyphosate-treated tissue was approximately 20 g kg−1 fresh mass greater than that of untreated tissue. Decrease in acid invertase activity by glyphosate was also observed in young internode discs; addition of auxin fully restored the enzyme activity. Collectively, these data show that the increase in sucrose accumulation by glyphosate treatment was due to a net increase in carbohydrates within an internode and a decrease in acid invertase activity, and that reduction of acid invertase activity in glyphosate-treated plants is mediated by auxin. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
