继测定植物缺水信号的电子探测仪之后,又有一种新的测定植物缺水信号的系统问世。这种系统可以在初见缺水症状出现之前3～5天测出缺水信号。该系统是根据对叶子上下两面的体细胞的观察设计的。体细胞之间的气孔根据植物的外部环境和内部状态(主要是含水状态)张开或闭合。 Following the introduction of an electronic detector for measuring the signal of plant water shortages, a new system for determining plant water deficit signals has emerged. This system can detect signs of water scarcity 3 to 5 days prior to initial signs of dehydration. The system is based on the observation of somatic cells on both the upper and lower leaves. The stomata between somatic cells are opened or closed according to the external environment of the plant and the internal state (mainly the hydrous state).