CHANGES OF TRIOSE-PHOSPHATE ISOMERASE ACTIVITY AND STUDY OF ITS POSSIBLE LOSS FROM CHLOROPLASTS DURING LEAF SENESCENCE

Authors

  • Juan Cuello Moreno
  • Mª J. Quiles
  • B. Sabater
Keywords: chloroplast, glucose-6-phosphate dehydrogenase, senescence, triose-phosphate isomerase

Abstract

We have studied the relative changes of triose-phosphate isomerase (TIM) in cytoplasm and chloroplasts during the senescence of primary barley leaves. The subcellular fractions were isolated by equillibrium ultracentrifugation in a density sucrose gradient. Cytoplasmic glucose-6-phosphate dehydrogenase and TIM activities diminished during senescence and their loss was retarded by kinetin. TIM activity was relatively low in chloroplasts. The presence of TIM activity between chloroplast and cytoplasm ultracentrifugation fractions suggested that TIM activity was lost from broken chloroplasts. However, we do not find in senescent leaves any factor stimulating chloroplasts breakdown.

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Author Biographies

Juan Cuello Moreno

Departamento de Biología Vegetal Facultad de Biología Universidad de Murcia

Mª J. Quiles

Departamento de Biología Vegetal Facultad de Biología Universidad de Murcia

B. Sabater

Departamento de Biología Vegetal Facultad de Ciencias Universidad de Alcalá de Henares
How to Cite
Cuello Moreno, J., Quiles, M. J., & Sabater, B. (1989). CHANGES OF TRIOSE-PHOSPHATE ISOMERASE ACTIVITY AND STUDY OF ITS POSSIBLE LOSS FROM CHLOROPLASTS DURING LEAF SENESCENCE. Anales de Biología, (15), 169–176. Retrieved from https://revistas.um.es/analesbio/article/view/34751
Issue
Section
Biología vegetal