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铝介导玉米幼苗中极性脂类的成分变化。

Aluminum mediates compositional alterations of polar lipid classes in maize seedlings.

作者信息

Chaffai Radhouane, Marzouk Brahim, El Ferjani Ezzedine

机构信息

Laboratoire de Biologie et Physiologie Cellulaires Végétales, Faculté des Sciences de Bizerte, 7021 Zarzouna, Tunisie.

出版信息

Phytochemistry. 2005 Aug;66(16):1903-12. doi: 10.1016/j.phytochem.2005.06.028.

Abstract

Changes in lipid composition were investigated on maize roots and shoots under aluminum stress. After 4d exposure to 100 microM Al, root growth was inhibited while shoot growth was not affected. In roots, the decrease of the DBI (double bond index) of total fatty acids may signal a decrease in membrane fluidity. The total lipids (TL) decreased by 49%, but phospholipids (PL), phosphatidylcholine (PC) and phosphatidylinositol (PI) increased to approximately 3-fold. The MGDG increased to 2-fold but no significant change was found in the DGDG. The steryl lipids (SL) increased by 69%. The SL/PL ratio decreased from 2.64 to 1.52 and the MGDG/DGDG ratio increased from 0.45 to 1.06 in roots of Al-stressed plants. Al leads to oxidative stress in roots of treated plants as indicated by the increase of malondialdehyde (MDA) concentrations. In shoots, changes in fatty acid composition were associated with an increase of the DBI in all lipid classes except that of the DGDG decreased. The PG was the lipid class which shows the large variation of fatty acid composition. No significant changes were found either for TL, PL, SL or MDA concentrations in shoots of Al-treated plants. While PE levels did not show significant change, PI and PG increased and PC decreased. However, the Al caused 87% decrease in the GL levels. The MGDG and DGDG decreased to 19- and 8-fold, respectively. The deleterious effects of Al on polar lipids could be caused by a direct intervention of Al on plasma membrane and/or alteration of cell metabolism.

摘要

研究了铝胁迫下玉米根和地上部的脂质组成变化。在暴露于100微摩尔铝4天后,根生长受到抑制,而地上部生长未受影响。在根中,总脂肪酸的双键指数(DBI)降低可能表明膜流动性降低。总脂质(TL)下降了49%,但磷脂(PL)、磷脂酰胆碱(PC)和磷脂酰肌醇(PI)增加到约3倍。单半乳糖基二酰甘油(MGDG)增加到2倍,但双半乳糖基二酰甘油(DGDG)未发现显著变化。甾醇脂质(SL)增加了69%。在铝胁迫植物的根中,SL/PL比值从2.64降至1.52,MGDG/DGDG比值从0.45增至1.06。铝导致处理植物根中的氧化应激,丙二醛(MDA)浓度升高表明了这一点。在地上部,脂肪酸组成的变化与除DGDG外所有脂质类别的DBI增加有关。磷脂酰甘油(PG)是脂肪酸组成变化较大的脂质类别。在铝处理植物的地上部,TL、PL、SL或MDA浓度均未发现显著变化。虽然磷脂酰乙醇胺(PE)水平未显示显著变化,但PI和PG增加,PC减少。然而,铝导致糖脂(GL)水平下降87%。MGDG和DGDG分别降至19倍和8倍。铝对极性脂质的有害影响可能是由于铝对质膜的直接干预和/或细胞代谢的改变所致。

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