Plants under Climatic Stress: VI. Chilling and Light Effects on Photosynthetic Enzymes of Sorghum and Maize 1

AUTOR(ES)

Taylor, Anthony O.

RESUMO

The activity of several photosynthetic enzymes was unaltered by exposure of sorghum or maize to low temperatures (10 C) and light (170 w m−2). Two light-activated C4-pathway enzymes, NADP-malate dehydrogenase and pyruvate Pi dikinase, were reduced in activity, and this was largely attributable to a loss of enzyme rather than to incomplete enzyme activation. Loss of NADP-malate dehydrogenase was more marked in sorghum than in maize, and in both species no loss occurred at 10 C when light levels were reduced from 170 to 50 w m−2. A light-dependent, low temperature-induced loss of catalase activity was also observed in maize leaves.

Documentos Relacionados

• Plants under Climatic Stress: V. Chilling and Light Effects on Radiocarbon Exchange between Photosynthetic Intermediates of Sorghum
• Plants under Climatic Stress: III. Low Temperature, High Light Effects on Photosynthetic Products
• Plants under Climatic Stress: I. Low Temperature, High Light Effects on Photosynthesis
• Plants under Climatic Stress: II. Low Temperature, High Light Effects on Chloroplast Ultrastructure
• Genetic Studies on Mutant Enzymes in Maize. VI. Elimination of Allelic Isozyme Variation by Glyceraldehyde Treatment