The nutrient transport of plant roots is closely related to the supply of oxygen. In special environments such as flooding, plant roots are in anoxic state, which will cause significant changes in the root's transmembrane H +, K + and O2 plasma molecular flow, which is closely related to the resistance of plants to flooding. However, the relationship between root ion molecular flow and resistance to flooding is still unclear. Australian scholars used non-damaging micro-measurement technology (MIFE) to study the ionic and molecular flow in different root tissues of two barley varieties under water immersion. The results show that there is a huge gap in the oxygen demand of barley roots with different functions. The largest amount of O2 outflow is now an extension zone about 1 mm from the root tip. The transmembrane ion activity caused by oxygen deficiency is essentially different between the root mature region and the extended region. Hypoxia in the mature area resulted in a drastic K + influx decline in the flooding sensitive species Naso Nijo, while the K942 influx did not decrease in the flooding resistant species TX9425. In the elongation zone, both types of barley showed an increase in K + influx at the beginning of the hypoxic treatment. Pharmacological experiments show that hypoxia-induced K + flow in the elongation zone is regulated by the K + inner channel (KIR) and non-selective cation channel (NSCC), while the mature zone is mainly regulated by the K + outer channel (KOR). Hypoxia has a real-time and significant effect on the root ion current, and the effect on the flooding sensitive and flooding resistant varieties is significantly different. The results of this paper not only directly reveal the change pattern of ion molecular flow in barley under anoxic (flooded) conditions, but also show the relationship between ion molecular flow and flood resistance, but also have important guidance for the practical application of screening waterlogging barley varieties. significance. Keywords: the non-invasive microelectrode ion flux measurement (MIFE), barley (Hordeum vulgare), waterlogging (waterlogging), K + References: Pang JY, et al. Plant, Cell & Environment, 2006 , 29: 1107-1121.
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