The role of lateral roots in bypass flow in rice (Oryza sativa L.)
The role of lateral roots in bypass flow in rice (Oryza sativa L.)
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DOI：
10.1111/j.1365-3040.2009.02078.x
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发表时间：
2010-05-01
影响因子：
7.3
通讯作者：
Flowers, Timothy J.
中科院分区：
文献类型：
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作者：
Faiyue, Bualuang;Al-Azzawi, Mohammed J.;Flowers, Timothy J.
尽管盐胁迫下水稻对Na+的吸收与质外体途径(即所谓的旁路流)有关，但这种流进入根部的起点仍有待阐明。利用示踪剂8-羟基-1，3，6-吡喃三磺酸(PTS)和水稻品种研究了侧根在旁通流中的作用。IR36。利用荧光显微镜和激光共聚焦扫描显微镜在侧根的维管组织中检测到PTS。冰冻扫描电子显微镜和荧光显微镜观察发现，侧根中没有外胚层。我们认为，PTS可以通过侧根的皮质层自由移动，进入中柱，并通过蒸腾流运输到地上部。
Although an apoplastic pathway (the so-called bypass flow) is implicated in the uptake of Na+ by rice growing in saline conditions, the point of entry of this flow into roots remains to be elucidated. We investigated the role of lateral roots in bypass flow using the tracer trisodium-8-hydroxy-1,3,6-pyrenetrisulphonic acid (PTS) and the rice cv. IR36. PTS was identified in the vascular tissue of lateral roots using both epifluorescence microscopy and confocal laser scanning microscopy. Cryo-scanning electron microscopy and epifluorescence microscopy of sections stained with berberine-aniline blue revealed that the exodermis is absent in the lateral roots. We conclude that PTS can move freely through the cortical layers of lateral roots, enter the stele and be transported to the shoot via the transpiration stream.