Skip Navigation



JXB Advance Access published online on August 30, 2005
Journal of Experimental Botany, doi:10.1093/jxb/eri267
This Article
Right arrow FREE Full Text (PDF) Freely available
Right arrow All Versions of this Article:
56/420/2745    most recent
eri267v1
Right arrow E-letters: Submit a response
Right arrow Alert me when this article is cited
Right arrow Alert me when E-letters are posted
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Add to My Personal Archive
Right arrow Download to citation manager
Right arrowRequest Permissions
Right arrow Disclaimer
Google Scholar
Right arrow Articles by Ishimaru, K.
Right arrow Articles by Madoka, Y.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Ishimaru, K.
Right arrow Articles by Madoka, Y.
Agricola
Right arrow Articles by Ishimaru, K.
Right arrow Articles by Madoka, Y.
Social Bookmarking
Add to CiteULike   Add to Connotea   Add to Del.icio.us  
What's this?

© The Author [2005]. Published by Oxford University Press [on behalf of the Society for Experimental Biology]. All rights reserved. For Permissions, please e-mail: journals.permissions@oupjournals.org
Received June 13, 2005
Accepted July 18, 2005

RESEARCH PAPER

Identification and physiological analyses of a locus for rice yield potential across the genetic background

Ken Ishimaru 1*, Takayuki Kashiwagi 1, Naoki Hirotsu 1, and Yuka Madoka 1

1 National Institute of Agrobiological Sciences, Kannondai 2-1-2, Tsukuba, Ibaraki 305-8602, Japan

* To whom correspondence should be addressed.
Ken Ishimaru, E-mail: kenshi{at}nias.affrc.go.jp


  Abstract

A new locus responsible for increased yield potential across the genetic background in rice (Oryza sativa L.) was identified and evaluated. Quantitative trait loci (QTLs) were analysed for the ratio of filled grains, a yield component, in backcrossed inbred lines of a japonica ‘Nipponbare’xindica ‘Kasalath’ cross for 3 years. Only one QTL (rg5), with a positive Kasalath allele, was detected across environments (years). The physiological functions of rg5 were clarified in a near-isogenic line (NILrg5) with a Kasalath chromosome segment containing rg5 in a Nipponbare genetic background. In NILrg5, carbohydrate storage capacity before heading or sink activity in the first or last stages of the reproductive phase was significantly higher than in Nipponbare (control). The ratio of filled grains and yield per plant were significantly higher in NILrg5 than in Nipponbare, by 5% (P <0.01) and 15% (P <0.05), respectively. These results suggest that rg5 improves carbohydrate storage capacity and keeps sink activity higher in the reproductive stage, and consequently increases yield potential. Greater capacity to accumulate carbohydrate is the main target for increasing rice yield potential; therefore, rg5 might function under other genetic backgrounds. Substitution of the rice cv. Kasalath chromosome segment containing rg5 gave higher yield potential in the top premium rice cv. Koshihikari. These results suggest that rg5 might be able to affect yield under different genetic backgrounds, and physiological analyses of the targeted locus might reveal these effects.

Keywords: Quantitative trait loci (QTL); yield.
Add to CiteULike CiteULike   Add to Connotea Connotea   Add to Del.icio.us Del.icio.us    What's this?




Disclaimer: Please note that abstracts for content published before 1996 were created through digital scanning and may therefore not exactly replicate the text of the original print issues. All efforts have been made to ensure accuracy, but the Publisher will not be held responsible for any remaining inaccuracies. If you require any further clarification, please contact our Customer Services Department.