期刊
PLANT CELL AND ENVIRONMENT
卷 32, 期 12, 页码 1833-1844出版社
WILEY
DOI: 10.1111/j.1365-3040.2009.02043.x
关键词
Paspalum; abaxial; adaxial leaf specification; C-3 photosynthesis; C-4 photosynthesis; Durum wheat; Kranz anatomy; maize; stomata
资金
- Fundacao para a Ciencia e a Tecnologia [SFRH/13728/2003]
- Fundacao Calouste Gulbenkian
- Society for Experimental Biology
- UK Biotechnology and Biological Sciences Research Council.
Photosynthesis and associated signalling are influenced by the dorso-ventral properties of leaves. The degree of adaxial/abaxial symmetry in stomatal numbers, photosynthetic regulation with respect to light orientation and the total section areas of the bundle sheath (BS) cells and the surrounding mesophyll (M) cells on the adaxial and abaxial sides of the vascular bundles were compared in two C-4 [Zea mays (maize) and Paspalum dilatatum] and one C-3 [Triticum turgidum (Durum wheat)] monocotyledonous species. The C-3 leaves had a higher degree of dorso-ventral symmetry than the C-4 leaves. Photosynthetic regulation was the same on each side of the wheat leaves, as were stomatal numbers and the section area of the BS relative to that of the M cells (BS/M section area ratio). In contrast, photosynthetic regulation in maize and P. dilatatum leaves showed a marked surface-specific response to light orientation. Compared to the adaxial sides of the C-4 monocotyledonous leaves, the abaxial surfaces had more stomata and the BS/M section area ratio was significantly higher. Differences in dorso-ventral structure, particularly in Kranz anatomy, serve not only to maximize photosynthetic capacity with respect light orientation in C-4 monocotyledonous leaves but also allow adaxial and abaxial-specific signalling from the respective M cells.
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