The long-term changes in midday photoinhibition in rice (Oryza sativa L.) growing under fluctuating soil water conditions

Kohtaro Iseki, Koki Homma, Takuya Irie, Tsuyoshi Endo, Tatsuhiko Shiraiwa

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Rice crops growing under fluctuating soil water conditions in a rainfed field frequently experience severe photoinhibition at midday, potentially decreasing their biomass production. In this study, the long-term changes in midday photoinhibition in five rice cultivars growing under variable soil water conditions in a rainfed field were evaluated by determining the maximum quantum yield of photosystem II (Fv/Fm). Fv/Fm was generally lower under rainfed conditions than under flooded conditions at 65 - 75 days after sowing (DAS), but was similar under both conditions at 109 - 124 DAS. This mitigation of photoinhibition over time is likely an up-regulation of mechanisms to dissipate excess electrons, and an analysis of covariance showed that the degree of mitigation under the rainfed condition varied among the cultivars. Such genotypic differences in the long-term changes in Fv/Fm might be determined by the capacity of the cultivar to adapt to drought conditions.

Original languageEnglish
Pages (from-to)287-294
Number of pages8
JournalPlant Production Science
Volume16
Issue number4
DOIs
Publication statusPublished - 2013 Sep 27
Externally publishedYes

Keywords

  • Acclimation
  • Chlorophyll fluorescence
  • Photoinhibition
  • Rainfed
  • Rice

ASJC Scopus subject areas

  • Agronomy and Crop Science

Fingerprint Dive into the research topics of 'The long-term changes in midday photoinhibition in rice (Oryza sativa L.) growing under fluctuating soil water conditions'. Together they form a unique fingerprint.

Cite this