为研究花后叶片和茎对小麦芽中镉(Cd)和砷(As)积累和运输的影响,在典型的Cd和As共污染农田中进行了田间试验,以探索开花后两个小麦品种不同部位Cd和As的分布和转运。结果表明,Cd主要分布在两个品种的节点上,在灌浆阶段,Cd从节间3到节间2,从节间2到节间1以及从鞘1到节间1的易位因子明显高于其他地上部分。然而,Cd主要分布在叶片中,在成熟期,Cd从鞘到叶和从节点1到轴的易位因子显着高于其他部位。此外,JM22中Cd从颖片到rachis和从rachis到籽粒的运移能力明显低于SN28,从而显着降低了rachis中Cd的浓度,闪芽,JM22的谷物减少了22.3%,40.8%,和44.4%,分别。同时,从灌浆期到成熟期主要分布在小麦叶片中,JM22的颖和籽粒中的As浓度分别比SN28低25.8%和33.3%。此外,在整个灌浆期和成熟期,As从鞘到节的易位因子显着高于从叶到鞘和从节到节间的易位因子438%和190%。此外,JM22中As从glums到谷物和从rachis到谷物的易位因子分别比SN28低40.6%和44.4%。总之,旗叶,节点1,并且轴调节了小麦籽粒中Cd的运输和积累,而叶子3,旗叶,节点1,闪烁,轴主要负责小麦籽粒中砷的运输和积累。
To investigate the effects of leaves and stems on the accumulation and transport of cadmium(Cd) and arsenic(As) in wheat shoots after flowering, a field experiment was conducted in a typical Cd and As co-contaminated agricultural land to explore the distribution and translocation of Cd and As in the different parts of two wheat cultivars after flowering. The results showed that Cd was mainly distributed in the nodes of two varieties, and the translocation factors of Cd from internode 3 to
node 2, from internode 2 to
node 1, and from sheath 1 to
node 1 were markedly higher than those of other aboveground parts during the grain-filling stage. However, Cd was mainly distributed in the leaves, and the translocation factors of Cd from sheath to leaf and from
node 1 to rachis was significantly higher than those of other parts at the mature stage. In addition, the transport capacity of Cd from glume to rachis and from rachis to grain in JM22 was significantly lower than that in SN28, which significantly reduced Cd concentrations in the rachis, glume, and grain of JM22 by 22.3%, 40.8%, and 44.4%, respectively. Meanwhile, As was mainly distributed in the wheat leaves from the grain-filling stage to the mature stage, and As concentrations in the glume and grain of JM22 were 25.8% and 33.3% lower than those of SN28, respectively. Additionally, the translocation factors of As from the sheath to the
node were significantly 438% and 190% higher than that from leaf to sheath and from
node to internode during the whole grain filling stage and mature stage. Moreover, the translocation factors of As from glumes to grains and from rachis to grains in JM22 were 40.6% and 44.4% lower than that in SN28, respectively. In summary, flag leaf, node 1, and the rachis had regulated Cd transport and accumulation in wheat grains, whereas leaf 3, flag leaf, node 1, the glumes, and the rachis were mainly responsible for As transport and accumulation in wheat grains.