植物管状细胞栓塞后的重新充注研究进展

Recent Study Advances on Refilling of Embolized Tracheary Elements in Plants

在植物吸收水分以后 ,水分运输对于植物正常的生长发育是非常重要的。在干旱和冬季反复冻融循环以后 ,植物体内的管状细胞容易充满水蒸气和空气 ,形成腔隙和栓塞。腔隙和栓塞的形成对水分在植物体内的运输造成了很大的障碍 ,从而影响了植物的生长与发育。当植物重新获得水分时 ,已形成腔隙和栓塞的管状细胞的重新充注能使一部分管状细胞的输水功能得到恢复 ,从而保证了一些器官的生理功能的正常进行。近些年来 ,人们对植物管状细胞的重新充注涉及到的许多植物组织和生理过程进行深入的研究 ,并提出了各种机理。鉴于植物管状细胞形成栓塞后重新充注对植物水分运输的重要生理作用 。

Water transport in plants is very important to normal growth and development of plants after they absorbed water from soil. When plants are under drought stress or suffer from freezing_thawing cycles, water vapor or air occurs in tracheary elements, i.e, cavitation and embolism occurs in tracheary elements of plants. Formation of cavitation and embolism breaks off water column in tracheary elements, results in the difficulty of water transport, which affects growth and development of plants. After this, the refilling of embolized tracheary elements can resuscitate water transport in some embolized tracheary elements, and maintain normal physiological functions of some organs. In recent years some refilling tissues and its physiological processes were studied in detail, and some refilling mechanisms were proposed. Some mechanisms of refilling were reviewed due to the physiological roles of refilling of embolized tracheary elements.