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Effect of Lanthanum(Ⅲ) on Reactive Oxygen Metabolism of Soybean Seedlings under Supplemental UV-B Irradiation

Author: ZuoShengRong
Tutor: ZhouQing
School: Jiangnan University
Course: Environmental Engineering
Keywords: Lanthanum UV-B radiation Soybean Seedlings Active oxygen metabolism Membrane lipid peroxidation Antioxidant system
CLC: X173
Type: Master's thesis
Year: 2006
Downloads: 204
Quote: 3
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Abstract

UV-B radiation on crop morphology, growth and development, physiological and biochemical produce numerous adverse effect; enhance crop metabolism, relieve the damage of acid rain, ozone, heavy metals, pesticides, pollution and stress on crop and with the right amount of rare earth. Therefore, this paper sensitive to UV-B crop soybean (Glycine max) Kennong 18 \under the impact of the active oxygen metabolism of soybean seedlings. UV-B radiation damage crops ecological defense research designed to elaborated rare earth resistance to UV-B stress injury mechanism from the molecular level to provide physiological and ecological basis for macro, to reveal rare earth induced plant resistance mechanism to expand the field of application of rare earth; new direction, rich in ultraviolet radiation ecology theory has a positive meaning. The main contents are as follows: (1) First of La (III) on the impact of of soybean seedlings antioxidant indicators. The results show that the 0 to 50 mg · L-1 dose of LaCl3 solution can improve the leaves of soybean seedlings antioxidant enzymes CAT and POD decreased cell membrane permeability and MDA content, improve the anti-oxidative metabolism of soybean seedlings, and thus beneficial to the growth and development. In this study, only reflect the effect of the rare earth elements the Hormesis phenomenon low promote. 0 ~ 50mg · L-1LaCl3 solution suitable to improve the effect of the anti-oxidative metabolism of soybean seedlings appeared in the first 3D. The LaCl3 soybean seedlings suitable for spraying dose of 20 mg · L-1, and its effect on the improvement of active oxygen metabolism in leaves of soybean seedlings can at least maintain the 13d. (2) and La (III) membrane fatty acid soybean seedlings under UV-B radiation stress. The test showed that, although the treatment groups membrane fatty acid components of the same control, but the ratio is subject to change. The percentage content of the UV-B treatment group leaves of soybean seedlings linolenic acid (18:3) decreased, while the percentage of palmitic acid (16:0) and stearic acid (18:0) content is increased, the degree of unsaturation index consequent reduced, and in the interests of the dose - response law; La (III) intervention to improve the active oxygen metabolism of soybean seedlings under supplemental UV-B radiation, which in turn slowing the unsaturated fatty acid content of the downward trend to slow the upward trend of the saturated fatty acid content, thereby reducing the soybean seedling leaves of membrane lipid peroxidation, the saturation index has increased, showing a better mitigation effect and alleviate the effects of low-dose than the high dose. Looking at the changes in membrane permeability, MDA concentration, H2O2 content, water content and other indicators, can be speculated that the non-enzymatic lipid peroxidation is one of the main reasons of UV-B radiation stress caused by the damage of the plasma membrane of soybean seedlings; La ( III) the involvement of UV-B radiation can reduce the stress on the leaves of soybean seedlings membrane lipid peroxidation. (3) The effects of La (III) on the active oxygen metabolism of soybean seedlings under UV-B radiation stress. Experimental results show that the stress of the UV-B radiation (T1: 0.15W · m-2 and T2: 0.45W · m-2), soybean seedling membrane permeability, malondialdehyde (MDA) concentration, H2O2 accumulated amount and candied gradual increase in the acid content of the stress period (1 to 5 days), while the decline in the recovery period (11d); catalase (CAT) activity and ascorbic acid (AsA) content (1 to 5 days) increased first and then decreased (6 11d); T1 peroxidase (POD) activity gradually increased during the stress period, the recovery period to maintain a higher level after the steep drop T2 POD activity continued to increase until the ninth day, after a slight decrease. 20 mg · L-1LA (III) slowed the upward trend of the first four indicators in the period of stress, accelerate the rate of decline of the recovery period, shorten the recovery course, eventually showed a good recovery, and better than the high recovery effect of low doses of dose; La (III) UV-B of CAT and POD gt; UV-B group (La (III) UV-B group except CAT 5d, but its peak

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