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Effects of Zn on Seed Germination and Seedling Growth of Wheat under Hg Stress

Author: YuanYuFei
Tutor: LiGuangDe
School: Shandong Agricultural University
Course: Environmental Science
Keywords: Zinc Selenium Mercury Stress Wheat Seed germination Physiological characteristics
CLC: S512.1
Type: Master's thesis
Year: 2011
Downloads: 53
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Abstract


Hg greater toxicity of heavy metals, and elements of the environmental pollution is also on plant growth and development and cause great harm to human health. The farmland soil once suffered Hg pollution, Hg most of the residues in the soil, and pose a serious danger to the crops. In order to explore the characteristics of the hazards of Hg on crops for Hg stress hurt the plant ecological protection technology research to provide a theoretical basis for wheat as the research object, using a sand-based culture and solution culture method, different concentrations of Zn, Se, heavy metal Hg Stress on seed germination and seedling growth process of physiological indicators. The main findings are as follows: (1) Compared with Hg alone, low concentrations of Zn (10 2 0 mg · L -1 ) added to promote wheat seed bud and root length, and 20 mg · L -1 Zn peak processing, high concentrations of Zn (50 1 00 mg · L -1 ) treatment to promote disappear, even showed inhibition; the Zn adding wheat seed germination rate showed no significant impact. (2) Zn added significantly promote Hg stress wheat seed alpha-amylase activity, and with the increase in Zn concentration, promote the role of a gradual decrease; protease and hydrogen peroxide activity of lower than Hg alone and activity decreased with increasing Zn concentration. (3) compared with Hg alone, the addition of Se to promote wheat seeds bud and root length, shoot length and root length was increased and then decreased with the Se concentration increased, the peak in the 15 mg · L < sup> -1 Se treatment; low concentrations of S (e5 1 0 mg · L -1 ) of Hg Stress wheat seed germination promote high concentration (15 2 0 mg · L -1 ) role in promoting disappear. Description can alleviate the toxic effects of Hg Stress on Wheat Seed the Se is joined on the whole. (4) the low concentration of SE (5 1 0 mg · L -1 ) under treatment, compared to the activity of the α-amylase of wheat seeds with Hg alone did not exhibit significant change in 15 mg · L -1 Se promote alpha-amylase activity to the control level of 20 mg · L -1 Se treatments promoting effect disappeared ; adding of Se inhibit protease activity, and increased with Se concentration, protease activity declining; catalase activity is on the whole higher than Hg alone and with elevated Se concentration increased and then decreased trend The peak in the 10 mg · L -1 Se processing. (5) compared with Hg alone, 10 5 0 mg · L -1 Zn added to some extent alleviate the Hg stress on wheat seedlings relative chlorophyll content inhibition relative chlorophyll content recovered to close to control level of 10 mg · L -1 Zn role in mitigation under the most obvious, with applied Zn concentration gradually rose, declining role in mitigation, Zn concentration of 100 mg · L -1 but suppressed relative chlorophyll content. (6) the addition of Zn in varying degrees to promote wheat seedlings of SOD and CAT activity, remission of Hg inhibition of its activity, this role was first and then decreased trend, of which 20 mg · the L -1 Zn treatments most obvious; the same time, the addition of Zn also inhibited the generation of MDA and free proline, remission of Hg caused membrane lipid peroxidation inhibition of MDA 10 mg · L -1 Zn deal with the most obvious, and the minimum value of free proline content appeared in 20 mg · L -1 Zn. Description 10 2 0 mg · L -1 Zn can be more effective to alleviate Hg stress caused by wheat seedlings membrane lipid peroxidation. (7) 5 1 5 mg · L -1 the addition of Se alleviate the inhibitory effects of of Hg stress on wheat chlorophyll relative content to reach or even exceed the level of the control 5 mg · L -1 Se treatments to ease the role of the most obvious, as the applied Se concentration rise, declining role in mitigation, when Se concentration of 20 mg · L -1 but suppressed relative content of chlorophyll. (8) the addition of Se reduced MDA and free proline content of the Hg Stress wheat seedlings, general remission of Hg caused membrane lipid peroxidation, 5 mg · L -1 Se treatment the most significant inhibition of MDA, free proline at 10 mg · L -1 Se treatments reached the lowest value; low concentration of Se (5 1 0 mg · L -1 ) to promote wheat seedling SOD and CAT activity, remission of Hg stress inhibition of its activity, the high concentration of Se (15 2 0 mg · L -1 ) disappear, even inhibition of its active role in promoting.

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CLC: > Agricultural Sciences > Crop > Cereal crops > Wheat > Wheat
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