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KMID : 0368420190620040254
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Journal of Plant Biology
2019 Volume.62 No. 4 p.254 ~ p.262
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The Sustainable Reasons of Controversy over the Mechanisms for the Stomatal Opening
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Lee Joon-Sang
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Abstract
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Depending on the diversities of the plant species, the mechanisms of the stomatal opening are thought to be different. First, Paphiopedilum insigna var. sanderae do not have chloroplasts in the guard cells. However, the stomata of this plant function as normal. Plants lacking the chloroplasts in the guard cell imply that the chloroplasts in guard cells are not related to stomatal opening. The guard cells without chloroplasts cannot be the source cells of the photosynthetic products, and the guard cells must be act as the sink cells. Second, the distinctive features of guard cells are specialized cell walls, which are considerably thickened to 5 μm. In contrast, the thickness of mesophyll cell walls is less than 100 nm. In the guard cells, most of the photosynthetic products may be used for the production of cell walls. The low photosynthetic activities of chloroplasts in the guard cell cannot be sufficient to maintain the structures and functions of the guard cell walls. Third, 40~60 chloroplasts in the guard cell of Lilium longiflorum which is belong to angiosperm were found in the first time. Lilium longiflorum of the relationship with mesophyll cells cannot be completely excluded, but it is assumed that guard cell chloroplasts in Lilium longiflorum may play an important role for the stomatal opening.
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KEYWORD
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Blue light photorteceptors, Guard cell chloroplasts, Lilium longiflorum, Mesophyll cells, Stomata
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