水分胁迫下超旱生植物梭梭的结构变化

梭梭同化枝的栅栏细胞层下为第二层光合细胞，其功能与Ｃ４植物维管束鞘细胞相同。自然风干４天失水５８％时，结构变化不显著，浸水处理２４小时，两层光合细胞的质膜弯曲，内陷；叶绿体膨胀，液泡体积增大。浸水４２小时，细胞结构发生很大变化，有大量细胞浸出物出现，核膜也略有肿胀。

Structural Changes of Super-xerophyte Haloxylon ammodendron under Water Stress

Between the palisade tissue and the parenchyma of Haloxylon ammodendronassimilation branch, there is another layer of cells which also have chloroplasts just like thebundle u sheath cells in C4 plant. The ultrastructrue of the photosynthetic cells did notchange obviously after drying slowly and lossing 58% water. Under flooding treatment, in24h, the plasma membranes of the two layers of the photosynthetic cells bent and becameconcave, the chloroplasts expanded and the vacuoles enlarged- After 42h, the cell structureschanged considerably, a great amount of cellular extracts emerged, the nuclear membranesalso lightly swelled.