论文部分内容阅读
严冬能锻炼植物的抗寒性,但也有些植物会冻死。冻死的植物外表看起来好像被开水烫伤一样,失去膨压,叶子很快变成褐色,逐渐干枯死亡。红苕、土豆等薯类作物受冻后,会从组织中流出水来。植物为什么会冻死呢?这是因为低温会使植物体内细胞间隙的水分结冰,体积约增大10％,这些冰的结晶体吸收细胞内的水分,细胞液愈来愈浓,使细胞内的生命物质——原生质水分愈来愈少。同时,
Harsh winter can exercise plant cold resistance, but some plants will freeze to death. Frozen plants look as if they are scalded with boiled water, lose turgor, leaves turn brown quickly, and die gradually. After the red potato, potatoes and other potato crops are frozen, water will flow from the tissues. Why do plants freeze to death? This is because the cold will make plants in the cell interstitial water icing, the volume increased by about 10%, these ice crystals absorb intracellular water, the more concentrated liquid, so that intracellular Life material - the protoplasm water less and less. Simultaneously,