Identification and characterization of genomic regions on chromosomes 4 and 8 that control the rate of photosynthesis in rice leaves

Shunsuke Adachi, Yukiko Tsuru, Naoko Nito, Kazumasa Murata, Toshio Yamamoto, Takeshi Ebitani, Taiichiro Ookawa, Tadashi Hirasawa

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

DNA marker-assisted selection appears to be a promising strategy for improving rates of leaf photosynthesis in rice. The rate of leaf photosynthesis was significantly higher in a high-yielding indica variety, Habataki, than in the most popular Japanese variety, Koshihikari, at the full heading stage as a result of the higher level of leaf nitrogen at the same rate of application of nitrogen and the higher stomatal conductance even when the respective levels of leaf nitrogen were the same. The higher leaf nitrogen content of Habataki was caused by the greater accumulation of nitrogen by plants. The higher stomatal conductance of Habataki was caused by the higher hydraulic conductance. Using progeny populations and selected lines derived from a cross between Koshihikari and Habataki, it was possible to identify the genomic regions responsible for the rate of photosynthesis within a 2.1 Mb region between RM17459 and RM17552 and within a 1.2 Mb region between RM6999 and RM22529 on the long arm of chromosome 4 and on the short arm of chromosome 8, respectively. The designated region on chromosome 4 of Habataki was responsible for both the increase in the nitrogen content of leaves and hydraulic conductance in the plant by increasing the root surface area. The designated region on chromosome 8 of Habataki was responsible for the increase in hydraulic conductance by increasing the root hydraulic conductivity. The results suggest that it may be possible to improve photosynthesis in rice leaves by marker-assisted selection that focuses on these regions of chromosomes 4 and 8.

Original languageEnglish
Pages (from-to)1927-1938
Number of pages12
JournalJournal of experimental botany
Volume62
Issue number6
DOIs
Publication statusPublished - Mar 1 2011
Externally publishedYes

Keywords

  • Hydraulic conductance
  • hydraulic conductivity
  • leaf water potential
  • nitrogen content
  • photosynthetic rate
  • quantitative trait locus
  • rice
  • root surface area
  • stomatal conductance
  • water stress

ASJC Scopus subject areas

  • Physiology
  • Plant Science

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