• Rice (Oryza sativa) plants have porous or hollow organs consisting of aerenchyma, which is presumed to function as a low-resistance diffusion pathway for air to travel from the foliage above the water to submerged organs. However, gas movement in rice plants has yet to be visualized in real time.
• In this study involving partially submerged rice plants, the leaves emerging from the water were fed nitrogen-13-labeled nitrogen ([¹³N]N₂) tracer gas, and the gas movement downward along the leaf blade, leaf sheath, and internode over time was monitored.
• The [¹³N]N₂ gas arrived at the bottom of the plant within 10 min, which was 20 min earlier than carbon-11 photoassimilates. The [¹³N]N₂ gas movement was presumably mediated by diffusion along the aerenchyma network from the leaf blade to the root via nodes functioning as junctions, which were detected by X-ray computed tomography.
• These findings imply the diffusion of gas along the aerenchyma, which does not consume energy, has enabled plants to adapt to aquatic environments. Additionally, there were no major differences in [¹³N]N₂ gas movement between paddy rice and deepwater rice plants, indicative of a common aeration mechanism in the two varieties, despite the difference in their response to flooding.

中文翻译：

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中空结构和气体运动的无创成像揭示了气体分压梯度驱动的气体在水稻叶片通气组织中的长距离运动到淹没器官

• 水稻 ( Oryza sativa ) 植物具有由通气组织组成的多孔或中空器官，据推测其作为空气从水面上方的叶子传播到水下器官的低阻力扩散途径。然而，水稻植物中的气体运动尚未实时可视化。
• 在这项涉及部分浸没的水稻植物的研究中，从水中出现的叶子被供给氮 13 标记的氮 ([ ¹³ N]N ₂ ) 示踪气体，气体沿着叶片、叶鞘和节间向下移动时间被监控。
• [ ¹³ N]N ₂气体在10分钟内到达植物底部，比碳11光同化物早20分钟。[ ¹³ N]N ₂气体运动可能是通过沿通气组织网络从叶片到根部的扩散介导的，这些节点通过充当连接的节点，通过 X 射线计算机断层扫描检测到。
• 这些发现意味着气体沿着不消耗能量的通气组织扩散，使植物能够适应水生环境。此外，水稻和深水水稻植物之间的[ ¹³ N]N ₂气体运动没有重大差异，这表明这两个品种的曝气机制具有共同的特征，尽管它们对洪水的反应存在差异。