以辽单566为试材，2017年6月2日进行基质育苗，长至5叶1心进行剪叶、断根处理，剪叶处理设置0%、15%、30% 3个水平，断根处理设置未断根与断根2个水平， 7月1日移栽至大田。结果表明：在剪叶15%处理下，叶片、茎秆转运量、转运率以及籽粒的贡献率显著增加，果穗的穗粗和千粒重也显著上升, 致使产量显著提高。同时剪叶断根显著降低了吐丝至成熟期叶片、茎秆中干物质转运率及籽粒贡献率，使得干物质积累量减少，导致产量显著下降。但随着剪叶面积的增加，可以在一定程度上缓解断根造成的不良影响。移栽玉米进行源调节后，对籽粒淀粉、蛋白质、氨基酸和脂肪含量的效应不同，对移栽玉米进行减源处理后发现籽粒脂肪含量不易受源库关系改变的影响，无明显变化。除脂肪含量外，蛋白质含量和氨基酸含量在苗期移栽后减少15%叶源时达到最大。同时去除植株的叶源和根源，会显著降低籽粒中蛋白质和氨基酸的百分含量。而淀粉百分含量表现趋势与蛋白质和总氨基酸百分含量相反，在苗期移栽后减少15%叶源和根源时达到最大。
英文摘要:
The experiments were conducted in May 24, 2017, using Substrate nursery, with maize variety Liaodan 566 as material, cutting leaf and root of source-sink regulation treatments, when the maize grow in 6 blades. The leaf cutting treatments were set at 0%, 15% and 30% 3 levels, and the root cutting treatments were set at 2 levels, cutting roots and not cutting roots, transplanted to farmland on July 1st. The main results were as follows: Under the treatment of 15% leaf cutting, the translocation rate of stem-sheath and leaf and the grain contribution rate increased significantly, meanwhile, ear diameter, grain weight per ear and thousand-kernel weights also increased significantly, resulting in a more increasing in yield. The treatment of cutting leaves and roots significantly reduced the dry matter transport rate and the contribution rate of grains in the leaves and stem-sheath during the silking stage to the mature stage, and the accumulation of dry matter decreased, leading to a significant decrease in yield. However, with the increase of leaf area, the adverse effects of root cutting can be alleviated to a certain extent. Different effects of source alteration on grain starch, protein，total amino acids and oil concentration could be found. After reducing the source of transplanted maize, it was found that the grain oil content was not affected by the change of source-sink relationship, and there was no significant change. In addition to oil content, protein content and total amino acid content reached the maximum when the leaf source was reduced by 15% after transplanting at seedling stage. Removal of leaf and root causes significantly reduced the percentage of protein and total amino acids in grains. The percentage of starch showed the opposite trend with the percentage of protein and total amino acid, and reached the maximum when the leaf and root sources were reduced by 15% after transplanting at seedling stage.
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