The Effects Of Copper Stress On Growth And Development Of Maize Root

This research, taking advantage of Cu solution with different concentration to conduct a threatening experiment on maize varieties---rich peasants No.1, initially discusses the influence the cuprum exercises on the growing tendency of maize, dry-and-wet weight, the length of root, the vigor of the root, the physiology and the biochemistry of the root, soil enzyme activity, soil microorganism and so on. Here is the consequence of this research:1. The influence cuprum exercises on the growth of the maize shows that cuprum obviously restrain the seedling and the growth of the maize and the restraint to the root is stronger than the overground headpiece; during the same time, the concentration of the cuprum is more intensive, the effect of restraint to the both overground and subterranean part is stronger. With the concentration and time increasing, the substance accumulation will become stow and the more intensive concentration is, the more obvious the effect is; The comparison between the overground and the subterranean part is very marked. When the concentration and time maximizes, the difference is the most obvious. When the time used is identical, the difference of the concentration from 0-Cu40 is obvious. The difference over Cu40 is not marked. When the concentration used is identical, with the tome increasing, the accumulation of the overground and subterranean dry material has been slow, especially the subterranean part is very obvious. It illustrates that the restraint effect of the subterranean part is stronger than the overground. With the time spent increasing, the comparison of difference of the root cap is obvious, and with the concentration increasing, the restraint effect is more intensive.2. The influence cuprum exercises on the growth of the root of the maize shows that during the same time spent, The absorption area of the solution of the cuprum with different concentration when dealing with the root of the seedling of the maize has reduced with different degrees, compared with the superficial area, the activity of SOD, the activity of POD and the content of the protein dissolved, among which, Cu100 has reduced least; the content of MDA has increased with different degrees, among which, Cu100 has increased most3. The influence cuprum exercises on the root of the maize and soil enzyme activity shows and microorganism shows that with the concentration of the Cu increasing,4 kinds of soil enzyme activity entirely represent the declining tendency. Soil saccharase in the initial development represents the tendency of increase first and descent later with the concentration of Cu+2 increasing. Before the 42th day, with the time spent increasing, the activity of saccharase increases and later represents the tendency of declining, and with the concentration of Cu decreasing, the activity of saccharase has correspondingly declines. The restraint effect the concentration of Cu with different degrees exercises on the soil urease is obvious. And with the concentration of Cu increasing, the restraint degree becomes more intensive. The activity of soil scavenger enzymes will gradually declines with the concentration of Cu increasing, which illustrates Cu has exercises the restraint effect on the soil scavenger enzymes; The activity of soil phosphatase represents the declining tendency with the concentration of Cu increasing, and the intensive concentration of Cu has exercises an obvious effect on the soil phosphatase, and with the time spent increasing, the acitivity of soil phosphatase also represents a tendency of declining. Cu with tow intensity of concentration has exercised less effect on the soil bacterium and actinomycete. When the concentration of Cu outnumbers 40umol/L, Cu with bw intensity of concentration has exercises more obvious restrint effect on the soil bacterium and actinomycete. With the concentration increasing, the restraint effect is becoming gradually intensive, which shows the cbse relationship between refined dosage and the effect The concentration of Cu with different degrees has exercises little effect on the soil fungus, and the effect Cu has exercises on the soil fungus has gradually attenuates.