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Plants often need to increase their tolerance to oxygen in a hypoxic environment to cope with oxygen deficiency. Hypoxic pretreatment (HPT) can increase plant glycolysis, higher ATP levels, and energy exchange. Ion transport ATPase is the main ATP depletion process, which is the cell's need to down-regulate ATP and the response to oxygen shortage, affecting cell metabolism and nutrient status of the entire plant. However, there has been no evidence of how this process is regulated in the root tip of hypoxic pretreatment.
To answer this question, Italian scientists evaluated HPT's changes in the metabolism of the two grapes. They compared two grapes that were sensitive to oxygen and resistant, and found that hypoxic pretreatment (HPT) increased tolerance to hypoxia. By measuring the production of heat, the activity of pyruvate deacidase (PDC), the activity of alcohol dehydrogenase (ADC), the production of ethanol, ATP, and the K + flow rate using a non-damage micro-test technique . The results indicate that HPT is an effective treatment method to maintain the sustainable metabolic behavior of grapes under hypoxia, especially the sensitive variety V. rupestris. Increased hypoxic tolerance is mainly due to the promotion of key enzyme activities (ADC and PDC) in alcohol fermentation, maintaining high levels of respiratory capacity, no significant decrease in heat and ATP production, and better ion balance and K + channels. Can function.
K + plays an important role in maintaining cytoplasmic balance and regulating cell turgor. The effect of HPT on K + absorption of roots under hypoxic conditions is to evaluate the adaptation of ion balance. HPT can significantly reduce the membrane permeability of K+, thereby maintaining ion balance and improving the survival rate of plants under stress conditions. If the non-invasive micro-measurement technique can be used to determine the oxygen flow rate, the model of oxygen metabolism on plant root metabolism and ion balance can be proposed centering on oxygen.
Key words: Anoxia, Cycloheximide, Hypoxic, K + flow rate, Vitis
References: Sergio Mugnai et al , Plant and Cell Physiology, 2011, 52: 1107-1116.
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Above : K + flow rate map of different varieties of grape roots under different treatments (normal oxygen content , HPT , NHPT ) .