Detection of QTL for exudation rate at ripening stage in rice and its contribution to hydraulic conductance

Toshio Yamamoto, Tadafumi Suzuki, Kenji Suzuki, Shunsuke Adachi, Jian Sun, Masahiro Yano, Taiichiro Ookawa, Tadashi Hirasawa

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


Dry matter production of crops is determined by how much light they intercept and how efficiently they use it for carbon fixation; i.e., photosynthesis. The high-yielding rice cultivar, Akenohoshi, maintains a high photosynthetic rate in the middle of the day owing to its high hydraulic conductance in comparison with the elite commercial rice cultivar, Koshihikari. We developed 94 recombinant inbred lines derived from Akenohoshi and Koshihikari and measured their exudation rate to calculate hydraulic conductance to osmotic water transport in a paddy field. A quantitative trait locus (QTL) for exudation rate was detected on the long arm of chromosome 2 at the heading and ripening stages. We developed chromosome segment substitution lines which carried Akenohoshi segments in the Koshihikari genetic background, and measured hydraulic conductance to both osmotic and passive water transport. The QTL was confirmed to be located within a region of about 4.2. Mbp on the distal end of long arm of chromosome 2. The Akenohoshi allele increased root surface area and hydraulic conductance, but didn't increase hydraulic conductivity of a plant.

Original languageEnglish
Pages (from-to)270-277
Number of pages8
JournalPlant Science
Publication statusPublished - Jun 1 2015
Externally publishedYes


  • Hydraulic conductance
  • Hydraulic conductivity
  • Quantitative trait locus
  • Rice
  • Root surface area

ASJC Scopus subject areas

  • Agronomy and Crop Science
  • Genetics
  • Plant Science


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