Plant science: Cytokinin oxidase regulates rice grain production

Motoyuki Ashikari, Hitoshi Sakakibara, Shaoyang Lin, Toshio Yamamoto, Tomonori Takashi, Asuka Nishimura, Enrique R. Angeles, Qian Qian, Hidemi Kitano, Makoto Matsuoka

Research output: Contribution to journalArticlepeer-review

1368 Citations (Scopus)


Most agriculturally important traits are regulated by genes known as quantitative trait loci (QTLs) derived from natural allelic variations. We here show that a QTL that increases grain productivity in rice, Gn1a, is a gene for cytokinin oxidase/ dehydrogenase (OsCKX2), an enzyme that degrades the phytohormone cytokinin. Reduced expression of OsCKX2 causes cytokinin accumulation in inflorescence meristems and increases the number of reproductive organs, resulting in enhanced grain yield. QTL pyramiding to combine loci for grain number and plant height in the same genetic background generated lines exhibiting both beneficial traits. These results provide a strategy for tailormade crop improvement.

Original languageEnglish
Pages (from-to)741-745
Number of pages5
Issue number5735
Publication statusPublished - Jul 29 2005
Externally publishedYes

ASJC Scopus subject areas

  • General


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