2 resultados para ARACHIS-HYPOGAEA L.

em Chinese Academy of Sciences Institutional Repositories Grid Portal


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近年来,我国花生重金属镉超标的现象屡见不鲜,致使花生在我国出口创汇的能力受到了严重影响。因此,本项研究选用北方两种花生-锦花5号和阜花13号为供试材料,采用室外盆栽方式,初步探讨了镉胁迫对花生品质的影响及花生对镉胁迫的响应机制,揭示了花生易富集镉和对镉高耐性的原因。 1.在外源高镉处理下,两品种花生的产量随镉处理浓度的增加而降低;籽实Cd含量均随土壤中Cd含量的增加而显著增加(p<0.05),在土壤低Cd处理时,花生籽实更易富集Cd;花生受Cd胁迫后,籽实的亮氨酸含量受Cd的影响较为严重;氨基酸组成比例在较低镉处理剂量下未受到影响。 2.受Cd污染的花生籽实,种皮Cd含量较高;蛋白质是络合镉的主要营养部位,而脂肪中镉的含量甚微,研究处理范围内均低于食品中Cd的限量值0.2 mg•kg-1 ;因此供试花生籽实不能作为人体对植物蛋白的来源,但可以作为人体对食用油脂的来源。 3.花生籽实中存在植物螯合肽PC4,它在花生中镉的耐性方面发挥着重要的作用。尽管非蛋白巯基(NPT)、半胱氨酸(Cys)、PC4和脯氨酸(Pro)含量受作物品种和外源镉处理剂量的影响,但它们对籽实中重金属镉的络合发挥着作用。此外,脯氨酸(Pro)还可以作为花生受镉胁迫的生物指示物。

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The adsorption Of DL-homocysteine (Hcy) and L-homocysteine thiolactone (HTL) on Au(1 1 1) electrode was investigated in 0.1 M HClO4 by cyclic voltammetry and in situ scanning tunneling microscopy (STM). Hcy and HTL molecules formed highly ordered adlayers on Au(1 1 1) surface. High-resolution STM images revealed the orientation and packing arrangement in the ordered adlayers. Hcy molecules formed (2root3 x 3root3)R30degrees adlayer structure and H-bonds between carboxyl groups were assumed to be responsible for the origin of tail-to-tail or head-to-head molecular arrangement, while HTL molecules formed (4 x 6) adlayer structure, and two different orientations and appearances in the ordered adlayer were found. Structural models were proposed for the two adlayers.