|
Plants in the growth process suffered a lot of negative growth factors, their source of these factors may be biological and non-biological. From the pressure of the biological growth is due to the plant suffered pest (mainly including the threat of insects, viruses, bacteria, fungi), instead of the biological growth pressure from its growth environment, also often referred to as non-biological stress, that adversity (Less favorable environments). Adversity general term survival and growth and development of various environmental factors unfavorable to plant damage plants, depending on the type of environment is divided into: chilling injury, high temperature, drought, waterlogging, high salt, radiation, peroxides, chemical reagent contamination. The plant stress resistance and tolerance of called Stress in Plants (plant stress-resistance). In the above categories, low temperature, drought, high salt is the main adverse factor affecting crop growth and yield. High salt and drought are the two most important factors constraining the growth of plants. High salt stress is usually caused by drought stress, which is a basic physiological phenomenon. High-salt deposition in the soil will have a lower water potential, making the plants difficult to get water and nutrients from the soil. Therefore, the high salt usually causes the plant is in a dry environment, the formation of the drought on the physiology. Including some of the major ions in the salt stress signal: Na , K , the H and Ca 2 These ionic interactions to maintain the stability of the intracellular environment. This study is mainly under laboratory conditions simulating a high-salt and osmotic stress environment, observe the physiological responses MAG2 gene under conditions of high salt and osmotic stress. Growth with the wild-type under normal conditions mag2, and there is no difference, but in the salt stress, osmotic stress and abscisic acid (ABA), paclobutrazol (PAC) of the Arabidopsis MAG2 gene T-DNA insertion mutant mag2 compared with the wild-type and other processing conditions showed that the seed germination and seedling growth was inhibited, and is very sensitive to salt stress. The analysis found that the expression of genes related to salt stress conditions, increase their expression mutant mag2. That MAG2 this gene can have some impact on salt stress tolerance MAG2 gene mutation, making mag2 mutant a significant increase in sensitivity to salt stress.
|