Effect of submergence on translocation, starch content and amylolytic activity in deep-water rice

I. Raskin, H. Kende

Research output: Contribution to journalArticlepeer-review

42 Scopus citations

Abstract

Submergence induces rapid internodal elongation in deep-water rice (Oryza sativa L. cv. Habiganj Aman II). We investigated the metabolic activities which help to support such fast growth. Three days of submergence in water under continuous light led to the mobilization of 65% of the starch from those regions of rice internodes which had been formed prior to submergence. Disappearance of starch was accompanied by a 70-fold enhancement of amylolytic activity. Similar increases in amylolytic activity were detected in response to ethylene and gibberellic acid. Submergence also caused a 26-fold increase in the translocation of newly synthesized photosynthetic assimilates from the leaves to the internodes and younger regions of the culms. These physiological processes are likely to provide the metabolic energy required for internodal elongation in response to submergence.

Original languageEnglish (US)
Pages (from-to)556-559
Number of pages4
JournalPlanta
Volume162
Issue number6
DOIs
StatePublished - Dec 1984
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Genetics
  • Plant Science

Keywords

  • Amylolytic activity
  • Assimilate partitioning
  • Deep water rice
  • Oryza (growth regulation)
  • Starch in rice

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