The plant growth process requires a suitable environment. These environments mainly include soil moisture, soil nutrients, light, temperature and so on. When the external environment is changed, it will affect the enzyme changes in the plant, promote plant metabolism and a series of effects, thus affecting Including plant roots, plant leaves, plant rhizomes and so on. Today, we will discuss the effects of soil moisture changes on the growth of plant roots, and use root analysis systems and soil moisture measuring instruments to investigate and study.
When the plant is exposed to drought, cold, lack of nutrients, high temperature and other adversities, a series of changes will occur in the body's protective enzyme activity, and the metabolism of the body will be adjusted to relieve the damage caused by the adverse environment. This study shows that under the condition of soil water deficit, appropriate application of nitrogen fertilizer can reduce the activities of SOD and POD in the root system of wheat, reduce the degree of membrane lipid peroxidation of wheat roots, and relieve the damage to the wheat root system; meanwhile, the same Under the condition of nitrogen application rate, the activity of SOD and POD in wheat roots also showed a downward trend with the increase of irrigation volume, and the decrease was not as good as the effect of nitrogen application under the same irrigation volume, indicating that nitrogen had a greater effect on protective enzyme activity than water.
Over-oxidation of membrane lipids caused by drought stress and other plant stresses in plant organs leads to an increase in MDA content in the body. Therefore, the level of MDA content can be used to indicate the degree of membrane lipid peroxidation, reflecting the plant's ability to adapt to adversity stress to a certain extent. Studies have shown that low nitrogen stress leads to increased MDA content in maize leaves and accelerates the rate of corn leaf senescence. This study shows that appropriate increase in the amount of nitrogen and irrigation can significantly reduce the MDA content of wheat roots, which to a certain extent, enhance the wheat's ability to resist stress, reduce its degree of damage, delay the aging of wheat roots. In addition, after the wheat grows into the jointing stage, whether it is nitrogen in the water deficit or in the nitrogen deficiency, the analysis of the root system shows that the root activity of wheat is increasing, indicating that the wheat suffers from water and In the double stress condition of nutrients, the growth activity of the root system is inhibited, which affects the absorption of water and mineral nutrients, which may adversely affect the growth and development of wheat in the later period.
Studies have shown that different wheat varieties have different adaptability to drought and nitrogen deficiency stress. Under different conditions of water and nitrogen treatment, the changes of physiological indexes of the two wheat varieties were different, and the strong drought resistance and drought resistance showed obvious advantages. Under the conditions of both soil water stress and nitrogen stress, the performance of the indicators was not as strong as under severe drought stress and nitrogen deficiency conditions. The root system showed stronger osmotic adjustment ability and antioxidant enzyme activity, and reduced its degree of damage. External adversity shows strong adaptability to maintain the normal physiological functions and growth of the plant.
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