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首页> 外文期刊>日本作物學會紀事 >Development of the Rice Panicle : III. Timecourse studies of translocation and distribution of ammonium nitrogen top-dressed at early ripening stage
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Development of the Rice Panicle : III. Timecourse studies of translocation and distribution of ammonium nitrogen top-dressed at early ripening stage

机译：稻竹的发展：III。早期成熟阶段的铵氮铝溶液易分配的时间表研究

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Translocation and distribution of nitrogen top-dressed at early ripening stage in rice plant (Oryza sativa L. cv Chyukyoasahi) were studied by using 15N as a tracer. The plants cultured in Kasugai nutrient solution were top-dressed with 15N-labelled ammonium sulfate at 7 days after heading. Heading was designated as the flower-opening day of the uppermost spikelet on the panicle. Incorporations of 15N were detected in culms, leaf sheathes and panicle at 3 hr after top-dressing, whereas in leaf blades it was detected 3 hr later. The amount of 15N in these organs increased markedly up to 48 hr after top-dressing, then began to decrease after 48 hr in culms, after 72 hr in leaf shcathes and after 96 hr in leaf blades. The amount of 15N in panicle continued to increase during experimental periods. These results imply that rctranslocation of incorporatcd 15N into leaf blades began to take place from 96 hr to 120 hr after top-dressing. Therefore, it is likely that the amount of 15N in panicle at 72 hr after top-dressing, accounting for about 25% of total nitrogen, was not transported from leaf bladcs but directly transported from roots. Much of 15N was distributed to early developing grains on each primary branch. This distribution patten was coincident with the differentiation order of spikelet on the inflorescence. In the grains on top and middle primary branches, incorporations of 15N were detectcd at 3 hr after top-dressing, while the grains on the bottom primay branch incorporated 15N at 6 hr after top-dressing. There were little differences in 15N percentages of total nitrogen translocated to the grains on all primary branches till 120 hr after top-dressing, but after that time 15N percentage of newly incorporated nitrogen was decreased in the grains on bottom primary branch. These results seem to be difficult to explain by the vascular bundle connection of each primary branches at the node of the flag leaf and penultimate leaf. The concentrations of 15N in the grains were lower than that of the whole panicle about 10 to 15% during a period when active absorption and translocation of top-dressed nitrogen was occurring. Moreover, increasing rate of 15N in whole panicle exceeded that in the grains during early stage. These results suggest that some of the nitrogen directly transported to panicle from roots is once incorporated into rachis, rachis-branches and husks and then retranslocated to growing grains.
机译：通过使用15N作为示踪剂研究了水稻植物早期成熟阶段氮气的易迁移和分布在水稻植物早期成熟阶段（Oryza Sativa L. CV ChyukyoAsahi）。在前线后7天在7天内将在Kasugai营养溶液中培养的植物含有15N标记的硫酸铵。标题被指定为穗上最高的小穗的开花日。在敷料后3小时，在3小时内在秆，叶子护套和穗上掺入15N，而在叶片叶片中以后检测到3小时。在敷料后，这些器官中15N的15N含量增加了48小时，然后在叶片叶片72小时后48小时后开始减少48小时后，96小时后叶片。在实验期间，胰腺15N的量继续增加。这些结果意味着掺入15N进入叶片的RctransLocation inclation in叶片在敷料后从96小时到120小时开始。因此，在敷料后72小时的胰腺中15n的量可能不会从叶片Bladcs运输，但直接从根部运输，占总氮的约25％。大部分15N分发给每个主要分支的早期开发颗粒。该分布彭定康与花序上的穗状花序的分化顺序重合。在顶部和中部枝条上的谷物中，在敷料后，15N的掺入在3小时后检测到3小时，而底部Primay分支上的谷物在敷料后6小时加入15N。在敷料后，在所有原发性枝上转移到谷物的总氮的15N百分比差异几乎没有差异，但在底部原色分支的颗粒中降低了新掺入的氮气的15N百分比后，在底部原代颗粒中减少了15N百分点。这些结果似乎难以通过旗叶和倒数第二叶节点的每个主要分支的血管束连接来解释。在发生顶衣氮的主动吸收和易位时，晶粒中15N的浓度低于整个胰腺的浓度低于10至15％。此外，在早期的颗粒中，整个穗中的15n的增加率超过了颗粒。这些结果表明，一些直接运输到根部的氮气掺入绞痛，脊柱树枝和壳体中，然后重新加工到生长的晶粒。

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