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Effect of Sulfur Nutrition on Root Hydraulic Conductance of Crops under Heavy Metal Stress

Author: KongXiangRui
Tutor: QuDong
School: Northwest University of Science and Technology
Course: Environmental Science
Keywords: Sulfur Nutrition Heavy metal stress Root hydraulic conductance (Lp_r) Corn Wheat
CLC: X173
Type: Master's thesis
Year: 2007
Downloads: 179
Quote: 0
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Abstract


Soil heavy metal pollution has led to the deterioration of soil quality of the environment, not only harmful to the soil ecosystem virtuous cycle, and would have a dramatic impact on the growth of plants. The root is the most direct organ induction soil contaminants and heavy metals in the soil first can affect the development and function of the roots, thereby inhibiting the overall growth conditions of the plant. The normal development of the essential trace elements, excessive amounts of copper and zinc in both copper and zinc plants will also have a biological toxic. Mercury, copper and zinc have become important factors that lead to soil environmental pollution. Conduction of the capacity of water uptake by plant roots play a decisive role in plant growth conditions. Root hydraulic conductance characterization root moisture transport conduction capacity, one of the most direct physiological indicators roots feel the changes in soil moisture. Stress also have an impact on plant root hydraulic conductance of heavy metals in the soil, heavy metal pollution and root hydraulic conductance between the dose - response relationship? Has been concerned about the problem of soil science and environmental science, but in this regard The study reported that their limited. The sulfur plant growth and development of mineral nutrient elements necessary, with other elements irreplaceable role in the physiological activity of the crop. Important component of the sulfur is cystine, cysteine ??and methionine, which sulfur-containing amino acid is the main component of the protein. Sulfur deficiency will affect the normal physiological activity of the plant, not only to reduce the yield of crops, but also have an impact on the quality and ability to adapt to environmental changes. Heavy metal stress, plants of organic sulfur compounds play an important role against environmental pollutants. Sulfur nutrition also improving crop root hydraulic conductivity and reduce soil play a role? Heavy metal root damage process to be carried out in-depth research. The test material to corn, wheat hydroponic pot experiment was conducted to study the regulatory role of sulfur nutrition under heavy metal stress conditions on crop seedling root hydraulic conductance. The experiment showed the following results: (1) control processing plants, Hg 2 Zn 2 and the of Cu 2 of wheat and corn roots hydraulic conductivity has a significant inhibitory effect the Hg 2 gt; Cu 2 gt; Zn 2 , and with the concentration of heavy metals increased inhibition becoming more and more significant. Normally Hg 2 can be used as a protein inhibitor, the inhibition of the expression of aquaporin affect plant hydraulic conductivity of the main reasons for increasing the concentration of Hg 2 , The impact of the hydraulic conductivity is declining. Cu 2 processing has also led to quickly lower the hydraulic conductivity, but 200μmol / L Cu and 100μmol / L Cu concentration between the gap is not obvious, this reflects Cu plant hydraulic conductivity the impact of the rate may be another mechanism exists. (2) from the hydroponic experiments seen sulfur nutrition on the root system to play the role of heavy metal stress are more likely to provide nutrition; while heavy metal of of Cu 2 sulfur nutritional stress plays a protective root effect, can effectively reduce the Cu 2 Stress inhibitory effect on the hydraulic conductivity, and this protective effect was enhanced with increasing concentration of sulfur nutrition. (3) stress is an important factor to affect root hydraulic conductance heavy metal stress. Stress reduction after 10min no matter in which sulfur concentration of Cu 2 stress after 30min than the corresponding sulfur concentration of about 50%, the intensity of heavy metal stress on root hydraulic conductance is very significant. However, the increase in the supply of sulfur nutrition can effectively reduce the impact of heavy metals on root hydraulic conductance, indicating that sulfur is of great significance to withstand the heavy metal pollution process. (4) by the wheat potted experiment Although Zn 2 Stress significant result in wheat roots stem the significant increase in the amplitude of the root to shoot ratio increased, but its hydraulic conductivity rate is significantly lower than the control treatment, and increased sulfur nutrition did not significantly seen, suggesting that zinc stress may significantly change the the water conduction mechanism of wheat roots. (5) in the pot experiment, of three farmland soil standard low-sulfur environment of heavy metal pollution (Cu 2 400mg/kg Zn 2 500mg/kg) on ??wheat root hydraulic conductance significantly inhibited, the inhibition rate of 34.61% and 36.89%, respectively. Press N: P2O5: K2O: S = 0.2:0.15:0.3:0.015 adding the proportion of sulfur fertilizer, the of Cu 2 and Zn , 2 of inhibition rate were 12.29% and 37.71 %. Hydraulic conductivity is significantly reduced compared with the control in the copper processing, but due to its inhibitory effect of hydraulic conductivity of sulfur nutrition significant mitigation, fully demonstrated the role of sulfur in the resist heavy metal stress.

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