【摘要】：為了探討AM(arbuscular mycorrhizal,叢枝菌根)真菌在Sb(銻)脅迫下對(duì)農(nóng)作物生長(zhǎng)及吸收Sb的影響,采用盆栽試驗(yàn)研究了在不同Sb添加量[即w(Sb)分別為0、500、1 000 mg/kg]下,接種AM真菌對(duì)玉米植株生物量以及N、P和Sb的吸收、膜脂過(guò)氧化[MDA(丙二醛)]和抗氧化酶活性的影響.結(jié)果表明:隨著土壤中Sb添加量的增加,玉米植株的生物量、w(TN)和w(TP)均呈顯著下降趨勢(shì),植株體內(nèi)的w(Sb)和Sb積累量、MDA含量、CAT(過(guò)氧化氫酶)以及POD(過(guò)氧化酶)活性均顯著上升.與未接種組相比,接種AM真菌顯著促進(jìn)了玉米植株的生長(zhǎng),提高了玉米植株地上部分的w(TN)和w(TP).在3個(gè)Sb添加量處理下,接種顯著增加了玉米植株地下部分的w(Sb)、地上和地下部分的Sb積累量以及地上部分的CAT活性,增幅分別為8.90%~23.30%、18.87%~28.37%、27.68%~78.95%及14.92%~88.52%;同時(shí),接種降低了玉米植株中Sb的轉(zhuǎn)運(yùn)率、玉米植株地上部分的w(Sb)和MDA含量,在1000 mg/kg Sb添加量下差異達(dá)顯著水平,三者分別降低了36.35%、22.81%和24.29%.研究顯示,在Sb污染環(huán)境下,接種AM真菌能夠減輕玉米植株膜脂過(guò)氧化程度,在提高玉米植株地下部分w(Sb)的同時(shí),也會(huì)降低Sb向地上部分的轉(zhuǎn)運(yùn),減輕Sb對(duì)玉米的毒害作用.
[Abstract]:In order to investigate the effects of arbuscular mycorrhizal fungi (AM (arbuscular mycorrhizal,) on the growth and Sb uptake of crops under Sb (antimony) stress, pot experiments were conducted to study the effects of different amounts of Sb (w (Sb) = 0, 500, 1 000 mg/kg, respectively) on the growth and uptake of Sb in crops. The effects of inoculating AM fungi on biomass, uptake of N, P and Sb, membrane lipid peroxidation [MDA (malondialdehyde)] and antioxidant enzyme activities in maize plants were studied. The results showed that with the increase of Sb content in soil, the biomass, w (TN) and w (TP) of maize decreased significantly, and the accumulation of w (Sb) and Sb and the content of MDA in the plant decreased significantly. The activities of CAT (catalase) and POD (peroxidase) were significantly increased. Compared with the non-inoculated group, inoculation of AM fungi significantly promoted the growth of maize plants, and increased the w (TN) and w (TP). In the aboveground parts of maize plants. Under the treatment of three Sb treatments, the Sb accumulation above ground and underground part of w (Sb), and the CAT activity of above ground part were significantly increased by 8.90% and 23.30%, respectively, in the subterranean part of maize plant, and the inoculation increased significantly by 8.90% and 23.30% respectively in the subsurface part of maize plant. 18.87%, 28.37%, 27.68%, 78.95% and 14.92%, 88.52%, respectively. At the same time, inoculation decreased the transfer rate of Sb in maize plants, and the contents of w (Sb) and MDA in the aboveground parts of maize plants were significantly different at 1000 mg/kg Sb, which decreased by 36.35%, 22.81% and 24.29%, respectively. The results showed that inoculation of AM fungi could reduce the degree of membrane lipid peroxidation in maize plants under the environment of Sb pollution, and could not only increase the w (Sb) of underground part of maize plants, but also decrease the transport of Sb to the aboveground parts of maize plants. Reduce the toxic effect of Sb on maize.
【作者單位】： 湖南農(nóng)業(yè)大學(xué)資源環(huán)境學(xué)院;中國(guó)環(huán)境科學(xué)研究院環(huán)境基準(zhǔn)與風(fēng)險(xiǎn)評(píng)估國(guó)家重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(41271338,41303066) 科技部科研院所技術(shù)開發(fā)研究專項(xiàng)(2014EG166135)
【分類號(hào)】：X172;X53

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