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- Title
Untangling metabolic and spatial interactions of stress tolerance in plants. 1. Patterns of carbon metabolism within leaves.
- Authors
Biel, Karl; Fomina, Irina; Nazarova, Galina; Soukhovolsky, Vladislav; Khlebopros, Rem; Nishio, John
- Abstract
The localization of the key photoreductive and oxidative processes and some stress-protective reactions within leaves of mesophytic C plants were investigated. The role of light in determining the profile of Rubisco, glutamate oxaloacetate transaminase, catalase, fumarase, and cytochrome- c-oxidase across spinach leaves was examined by exposing leaves to illumination on either the adaxial or abaxial leaf surfaces. Oxygen evolution in fresh paradermal leaf sections and CO gas exchange in whole leaves under adaxial or abaxial illumination was also examined. The results showed that the palisade mesophyll is responsible for the midday depression of photosynthesis in spinach leaves. The photosynthetic apparatus was more sensitive to the light environment than the respiratory apparatus. Additionally, examination of the paradermal leaf sections by optical microscopy allowed us to describe two new types of parenchyma in spinach—pirum mesophyll and pillow spongy mesophyll. A hypothesis that oxaloacetate may protect the upper leaf tissue from the destructive influence of active oxygen is presented. The application of mathematical modeling shows that the pattern of enzymatic distribution across leaves abides by the principle of maximal ecological utility. Light regulation of carbon metabolism across leaves is discussed.
- Subjects
SPINACH; PLANT metabolism; EFFECT of stress on plants; OXIDATIVE stress; PHOTOSYNTHESIS; PLANT ecology; BOTANICAL microscopy
- Publication
Protoplasma, 2010, Vol 245, Issue 1-4, p49
- ISSN
0033-183X
- Publication type
Article
- DOI
10.1007/s00709-010-0135-7