Journal Article

Separate Localization of Light Signal Perception for Sun or Shade Type Chloroplast and Palisade Tissue Differentiation in <i>Chenopodium album</i>

Satoshi Yano and Ichiro Terashima

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 42, issue 12, pages 1303-1310
Published in print December 2001 | ISSN: 0032-0781
Published online December 2001 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pce183
Separate Localization of Light Signal Perception for Sun or Shade Type Chloroplast and Palisade Tissue Differentiation in Chenopodium album

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  • Biochemistry
  • Molecular and Cell Biology
  • Plant Sciences and Forestry

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Physiological and ecological characteristics of sun and shade leaves have been compared in detail, but their developmental processes, in particular their light sensory mechanisms, are still unknown. This study compares the development of sun and shade leaves of Chenopodium album L., paying special attention to the light sensory site. We hypothesized that mature leaves sense the light environment, and that this information determines anatomy of new leaves. To examine this hypothesis, we shaded plants partially. In the low-light apex treatment (LA), the shoot apex with developing leaves was covered by a cap made of a shading screen and received photosynthetically active photon flux density (PPFD) of 60 µmol m–2 s–1, while the remaining mature leaves were exposed to 360 µmol m–2 s–1. In the high-light apex treatment (HA), the apex was exposed while the mature leaves were covered by a shade screen. After these treatments for 6 d, we analyzed leaf anatomy and chloroplast ultrastructure. The anatomy of LA leaves with a two-layered palisade tissue was similar to that of sun leaves, while their chloroplasts were shade-type with thick grana. The anatomy of HA leaves and shade leaves was similar and both had one-layered palisade tissue, while chloroplasts of HA leaves were sun-type having thin grana. These results clearly demonstrate that new leaves differentiate depending on the light environment of mature leaves, while chloroplasts differentiate depending on the local light environment.

Keywords: Key words: Anatomy — Chenopodium album — Chloroplast — Light sensory mechanism — Palisade tissue — Sun and shade leaf.; Abbreviations: HA, high-light apex; HH, high-light to high-light; HL, high-light to low-light; LA, low-light apex; PPFD, photosynthetically active photon flux density; PCL, average number of cell layers of the palisade tissue; TNP, index of total number of cells in the palisade tissue.

Journal Article.  4662 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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