Leaf ultrastructure of C4 species possessing different Kranz anatomical types in the cyperaceae

Osamu Ueno, Tomoshiro Takeda, Eizo Maeda

Research output: Contribution to journalArticle

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Abstract

The leaf ultrastructure of NADP-malic enzyme type C4 species possessing different anatomical features in the Cyperaceae was examined: types were the Rhynchosporoid type, a normal Kranz type in which mesophyll cells are adjacent to Kranz cells, and Fimbristyloid and Chlorocyperoid types, unusual Kranz types in which nonchlorophyllous mestome sheath intervenes between the two types of green cells. They show structural characteristics basically similar to the NADP-malic enzyme group of C4 grasses, that is, centrifugally located chloroplasts with reduced grana and no increase of mitochondrial frequency in the Kranz cells. However, the Kranz cell chloroplasts of the Fimbristyloid and Chlorocyperoid types exhibit convoluted thylakoid systems and a trend of extensive development of peripheral reticulum, although those of the Rhynchosporoid type do not possess such particular membrane systems. The suberized lamella, probably a barrier for CO2 diffusion, is present in the Kranz cell walls of the Rhynchosporoid type and in the mestome sheath cell walls of the other two types, and tightly surrounds the Kranz cells (sheaths) that are the sites of the decarboxylation of C4 acids. These ultrastructural features are discussed in relation to C4 photosynthetic function.

Original languageEnglish
Pages (from-to)141-152
Number of pages12
JournalThe Botanical Magazine Tokyo
Volume101
Issue number2
DOIs
Publication statusPublished - Jun 1 1988

All Science Journal Classification (ASJC) codes

  • Plant Science

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