Relation between Neodymium and Calcium in Rape under Ca-Deficiency

Rareearthelements (REEs)areofcertainphysi ologicalactivity .Theycanimprovetheproductivityandqualityofcropsiftheyareusedaptly[1] .Howev er ,thebasicltheoriesneedtobeexploreddeeplythatREESwereapplicated .inagriculture .SomeREEsaresimilartoCainchemicalproper ties ,andtheyhavebeendescribedasCaanalogs[2 ] .Forexample ,thecrystalradiusoflanthanidecationsisin 96 1 1 5 pm ,whichissimilartothatoftherangeofCa2 (99pm) ,especiallythecrystalradiusofNd3 (99.5pm )isclosesttothatofCa2 .REEsoften…     

Effect of Neodymium on Physiological Activities in Oilseed Rape during Calcium Starvation

The effects of RE on increasing crop productivity and stress tolerance were reported inpast years[' '2). La ion acts as a calcium-influxinhibitor by displacing Ca2 from cell wallsand occupying Ca2 -binding sites on the plasmalemma, as effective as Ca in the deferral ofsenescence. Besides blocking calcium channels, La has been frequently reported to mimicCa2 effect on plant ion transport. Migliaccioet al. found that both Ca2 and La3 stimulated auxin uptake into pea epicotyl segmentsfr…     

汞污染对植物品质指标的影响

通过盆栽试验,研究了黄红壤和青紫泥上种植的小白菜对不同质量分数汞的累积程度及其生理、品质指标的变化,如生物量、叶绿素质量分数,以及在可食部的累积量、可溶性糖、Vc和纤维素质量分数.本试验汞以氯化汞的形式加入,其加入的质量分数分别设置为0、0.25×10-6、0.50×10-6、1.00×10-6、1.50×10-6、2.00×10-6、3.00×10-6、6.00×10-6共8个添加水平.结果表明,白菜生物量和叶绿素质量分数在黄红壤中有明显的增加趋势,但在青紫泥中规律不明显;白菜可食部汞的累积与土壤全汞、有效汞质量分数有显著的相关性;可溶性糖质量摩尔浓度随土壤汞质量分数的增加而增加,Vc质量分数明显减小,两者都显示了较为明显的受胁迫性,可作为预警指标.     

稀土元素定位在生物体系中的应用

弄清稀土元素在细胞中作用的部位,对理解其生物效应具有极其重要的意义。同时,稀土元素本身具有一些特殊的化学性质,利用细胞定位技术,可以更有效地对生物系统研究。     

Distribution, Transportation and Cytolocalization of Neodymium in Oilseed Rape (Brassica napus L.)

Ｉｔｈａｓｂｅｅｎｒｅｐｏｒｔｅｄｔｈａｔｔｈｅｒａｒｅｅａｒｔｈｅｌ ｅｍｅｎｔｓ (ＲＥＥ)ｈａｖｅａｂｅｎｅｆｉｃｉａｌｆｕｎｃｔｉｏｎｏｎｃｒｏｐｙｉｅｌｄａｎｄｑｕａｌｉｔｙａｓｗｅｌｌａｓｓｔｒｅｓｓ ｒｅｓｉｓ ｔａｎｃｅ[1] .Ｈｏｗｅｖｅｒ,ｍｏｓｔｏｆｔｈｅｒｅｓｅａｒｃｈｅｓｗｅｒｅｆｏｃｕｓｅｄｏｎｔｈｅｅｆｆｅｃｔｓｏｆＲＥＥｃｏｍｐｏｕｎｄｏｎｃｒｏｐｙｉｅｌｄｉｎｄｅｘｅｓ ,ｏｒｌｉｍｉｔｅｄａｔｔｉｓｓｕｅｌｅｖ ｅｌ ,ｗｈｉｌｅｔｈｅｒｅｓｅａｒｃｈｏｎｔｈｅｅｆｆｅｃｔ…     

稀土元素钕对油菜超微结构的影响

电镜观察表明：低浓度的钕对完全营养培养的油菜顶叶叶尖细胞的叶绿体片层结构有明赤的改善作用,而高浓度的钕会引起结构损坏。适当浓度的钕能对缺钙油菜苗受损的细胞有修复作用,这表明钕有部分替代钙的作用。钕对油菜主根根尖细胞的作用与对顶叶叶尖细胞作用类似,但对根细胞超微结构影响更为明显。