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着生在小穗轴上的一对浆片是由许多大型薄壁细胞和分布均匀的若干条与小穗轴维管束相连的小维管束组成。每一浆片中小维管束数目因品种不同而异,一般含有15—20条。每一小维管束中具有1—5列导管,2—4列筛管和10个左右的小型薄壁细胞。小型薄壁细胞的细胞质浓,细胞器多,富含线粒体。不管是大型的还是小型的薄壁细胞之间的胞间连丝都很丰富。这些结构特点可为颖花在开闭过程中,浆片的快速吸水失水以及物质的迅速转运提供通道和能量。浆片中含有淀粉酶。开颖时浆片的干物重及可溶性糖含量均有所增加。可溶性糖除来自淀粉水解外,还可能来自小穗轴的输入。我们认为,水稻的开颖运动主要是由浆片的渗透压所调节的水势变化而引起的;而闭颖过程则受小穗轴控制。切除小穗轴的颖花因浆片内水分不能外运而影响闭颖。
A pair of blades born on the rachilla axis is composed of many large parenchyma cells and a number of evenly distributed small vascular bundles connected to the spikelet. The number of small vascular bundles in each pulp varies according to the variety and generally contains 15-20 strips. There are 1-5 columns, 2-4 columns, and about 10 small parenchymal cells in each small vascular bundle. Small parenchyma cells of the cytoplasm, organelles, rich in mitochondria. Whether large or small parenchyma cells between the parenchymal silk are very rich. These structural features provide access and energy for spongy flow during opening and closing, rapid water absorption and loss of pulp, and rapid material transport. Pulp contains amylase. Open when the pulp dry weight and soluble sugar content have increased. In addition to soluble starch from starch hydrolysis, but also from the spikelet input. In our opinion, the open-leaf movement of rice is mainly caused by the change of water potential regulated by the osmotic pressure of the pulp, while the closing process is controlled by the spikelet. Spikelet excision of the spine due to the water within the pulp can not be affected by the alienation.