Structure of intercellular airspace in the lamina of floating leaves of Nymphaea candida C. Presl (Nymphaeaceae): bizarre combination of homobaric and heterobaric typesстатья
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Дата последнего поиска статьи во внешних источниках: 10 августа 2018 г.
Аннотация:The whole mesophyll of floating leaves of Nymphaea candida is chambered. Both palisadeand spongy chlorenchymata consist of 1–2-layered septa between substomatal chambers and hugeairspaces, respectively. The septa of the spongy chlorenchyma are imperforate and make this tissue mass heterobaric in the absence of bundle-sheath extensions of medium-sized veins. The septa of the palisade chlorenchyma are increasingly imperforated near the stomata, but they become increasingly perforated inwards and pass into a loose network of the collecting cells (Sammelzellen) to make the palisade chlorenchyma mass homobaric. The palisade chlorenchyma of chambered type is unlikely to need lateral gas diffusion through the mesophyll to maintain its photosynthesis.