Exogenous proline and glycinebetaine suppress apoplastic flow to reduce Na+ uptake in rice seedlings

Muhammad Abdus Sobahan, Carlos Raul Arias, Eiji Okuma, Yasuaki Shimoishi, Yoshimasa Nakamura, Yoshihiko Hirai, Izumi C. Mori, Yoshiyuki Murata

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)


The application of exogenous proline and glycinebetaine (betaine) confers salt tolerance on plants undersalt stress. The e?ects of exogenous proline and betaine on apoplastic ?ow in rice plants under saline conditions were investigated using trisodium-8-hydroxy-1,3,6-pyr-enetrisulphonic acid (PTS), an apoplastic tracer. Rice plants took up more PTS under light conditions than under dark conditions. Salt stress increased PTS uptake and Nap content of rice leaves, but did not a?ect Kp content, resulting in a lower Kp/Nap ratio. Addition of proline or betaine to the saline medium suppressed Napinduced PTS uptake and Nap accumulation, while the Kp content was slightly increased, which led to a high Kp/Nap ratio under saline conditions. These results suggest that exogenous proline and betaine suppressed Nap-enhanced apoplastic ?ow to reduce Nap uptake in rice plants.

Original languageEnglish
Pages (from-to)2037-2042
Number of pages6
JournalBioscience, Biotechnology and Biochemistry
Issue number9
Publication statusPublished - 2009


  • Apoplastic flow
  • Proline
  • Rice
  • Salt stress

ASJC Scopus subject areas

  • Biotechnology
  • Analytical Chemistry
  • Biochemistry
  • Applied Microbiology and Biotechnology
  • Molecular Biology
  • Organic Chemistry


Dive into the research topics of 'Exogenous proline and glycinebetaine suppress apoplastic flow to reduce Na+ uptake in rice seedlings'. Together they form a unique fingerprint.

Cite this