Journal of
Plant Breeding and Crop Science

  • Abbreviation: J. Plant Breed. Crop Sci.
  • Language: English
  • ISSN: 2006-9758
  • DOI: 10.5897/JPBCS
  • Start Year: 2009
  • Published Articles: 421

Full Length Research Paper

Plant architecture and its responses to high planting density and low fertilizer of reduced culm number mutants in rice (Oryza sativa L.)

Mojith Ariyaratna1, Itsuro Takamure2 and Kiyoaki Kato1*
  1Department of Crop Science, Obihiro University of Agriculture and Veterinary Medicine, Nishi 2-11 Inada, Obihiro, Hokkaido, 080-8555, Japan. 2Graduate School of Agriculture, Hokkaido University, Kita 9 Nishi 9, Kita-ku, Sapporo, Hokkaido, 060-8589, Japan.
Email: [email protected]

  •  Accepted: 25 May 2011
  •  Published: 31 July 2011



Plant architecture is of major agronomic importance as it determines the potential grain yield depending on environmental conditions in rice (Oryza sativa L.). Here, we characterized plant architecture and its response to low fertilizer and high planting density in five rice “reduced culm number (rcn)” mutants; “rcn1-2rcn2rcn4-2rcn5and rcn6”, originating from rice cultivar ‘Shiokari’, with ‘Shiokari’ as a parental control. Under control condition, a positive correlation was observed between tiller number and plant height showing that each rcn controls both apical and axillary shoots elongation. High density and low fertilizer had the negative effects on tillering and main shoot development involving main culm length, leaf number, panicle length, spikelet number on main culm in ‘Shiokari’. The degrees of negative effect on main shoot development by the present environmental stresses were depended on ‘rcn’ genotype. Among them, ‘rcn6’ constantly developed main shoot architecture under low fertilizer or high density planting.


Key words: Tillering, reduced culm number mutant, low fertilizer, high density, rice.