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The role of lateral roots in bypass flow in rice (Oryza sativa L.)

journal contribution
posted on 2023-06-08, 11:30 authored by Bualuang Faiyue, Mohammed J Al-Azzawi, Tim Flowers
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.

History

Publication status

  • Published

Journal

Plant, Cell & Environment

ISSN

0140-7791

Publisher

Wiley

Issue

5

Volume

33

Page range

702-716

Department affiliated with

  • Evolution, Behaviour and Environment Publications

Full text available

  • No

Peer reviewed?

  • Yes

Legacy Posted Date

2012-05-22

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