907 PB 531 EFFECT OF HIGH TEMPERATURE ON SUCROSE METABOLISM IN SOURCE AND SINK TISSUES OF POTATO
| Autor: | James H. Lorenzen, Abbas Lafta |
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| Rok vydání: | 1994 |
| Předmět: | |
| Zdroj: | HortScience. 29:564a-564 |
| ISSN: | 2327-9834 0018-5345 |
| DOI: | 10.21273/hortsci.29.5.564a |
| Popis: | Potato plants are sensitive to heat stress, which reduces tuber yield and alters whole plant partitioning. This study was conducted to determine the effect of high temperature on activity of enzymes related to sucrose metabolism in source and sink tissues of potato plants. Potato plants were exposed to two temperature regimes (20 and 28 C) for 3 days. High temperatures resulted in an increase in sucrose synthase and acid and neutral invertase activities in young growing leaves (< 1.5 cm). However, there were no significant changes in these enzyme activities in stems or mature leaves. The results indicate that both sucrose synthase and invertases are involved in sucrose breakdown in young leaves. We will also discuss the role of sucrose phosphate synthase in mature source leaves and how it is affected by temperature and altered partitioning pattern. Activity of sucrose synthase was affected more than ADP-glucose pyrophosphorylase in small growing tubers exposed to high temperatures. |
| Databáze: | OpenAIRE |
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