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Variegation in Arum italicum leaves. A structural-functional study
Nicoletta La Rocca1, Nicoletta Rascio, Paolo Pupillo
1Department of Biology, University of Padova, Via U. Bassi, 58/B, 35131 Padova, Italy. nicoletta.larocca@unipd.it
Plant Physiology and Biochemistry : PPB
|November 15, 2011
Summary
Leaf variegation in Arum italicum, characterized by variable palisade cell layers, does not limit photosynthesis. This "variable palisade" type allows variegated and full-green plants to coexist in natural populations.
Area of Science:
- Plant biology
- Photosynthesis research
- Leaf anatomy
Background:
- Leaf speckling (variegation) is common in shade-dwelling plants, often caused by loosened palisade tissue.
- Arum italicum exhibits a "variable palisade" type of variegation, with distinct differences in leaf structure between dark-green, pale-green, and full-green areas.
Purpose of the Study:
- To investigate the anatomical and physiological basis of variegation in Arum italicum.
- To determine the impact of this variegation on photosynthetic efficiency.
Main Methods:
- Comparative analysis of leaf anatomy (thickness, palisade cell layers, chlorophyll content).
- Chlorophyll fluorescence imaging and O₂ exchange measurements to assess photosynthetic activity.
- Microscopic examination of chloroplasts.
Main Results:
- Pale-green areas have fewer, shorter palisade cells and less chlorophyll than dark-green areas.
- Full-green leaves are thinner than dark-green sectors but have similar chlorophyll content.
- Photosynthetic activity per unit area is comparable across variegated and full-green leaves at saturating light, though full-green leaves require higher light intensity.
Conclusions:
- Variegation in Arum italicum is a "variable palisade" type, defined by the number and arrangement of palisade cell layers.
- The variegated leaf structure does not negatively impact the overall photosynthetic energy budget, explaining the coexistence of variegated and full-green plants.
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