About - Outline of NBRP-Rice (second term 2007-2011)

Significance of NBRP-Rice Resources
Achievement of the first term NBRP-Rice Resources
Outline and objective in the second term

- Evaluation of bacterial blight resistance reaction

- Results of bacterial blight resistance reaction in wild accessions

Collection and Characterization of Genetic Resources of Rice, Genus Oryza

Significance of NBRP-Rice Resources

The genus Oryza is comprised of 23 species, including 21 wild and two cultivated species. These wild species have a wealth of genetic diversity such as resistance for disease/insects and other environmental stresses that are hard to find among the present cultivars (Fig.1 and 2). Meanwhile, the cultivated rice varieties have numerous potential functions for high yield performance. Thus, conservation and investigation of variation and diversity is extremely important in further improving rice performance. To promote a better understanding of genetic diversity and gene function, it is essential that the rice resources and information on their features are fully equipped and accessible to the broadest possible range of researchers. The NBRP-Rice resources (National Bio-Resource Project: Rice Resources) aims to establish a system to collect, preserve, manage and distribute rice resources and information collected or developed in universities and institutions under the MEXT.

Fig.1:An outbreak of brown planthopper in a farmer's field (Kumamoto, Japan 2005.10.3)

Fig.1 An outbreak of brown planthopper in a farmer's field (Kumamoto, Japan 2005.10.3)

Fig.2:Morphological variations in wild rice species (upper) and mutant rice(lower)

Fig.2 Morphological variations in wild rice species (upper) and mutant rice(lower)

Achievement of the first term NBRP-Rice Resources

  • The first term NBRP-Rice Resources collected and maintained nearly 1,700 wild rice accessions encompassing almost all of the species in the genus Oryza. More than 17,000 strains including MNU-induced rice mutants and other experimental strains of cultivated rice were also collected. These resources were made available for distribution upon request via the website, and are widely utilized both domestically and overseas.

Outline and objective in the second term

The objective of this project is to increase the availability of the genetic stocks that were conserved in the first term NBRP-Rice Resources. For this purpose, we have been characterizing individual wild rice accessions, and incorporating the data in our database "ORYZABASE". Maintenance and distribution of the rice genetic stocks are being continued as before. Main activities in the second term are as follows.

(1) Agronomical characterization of the wild rice collections

Evaluation of bacterial blight resistance reaction

Results of bacterial blight resistance reaction in wild accessions

(2) DNA marker fragment analysis of 23 Oryza species and reclassification of the preserved wild accessions.

(3) Accumulation of experimental rice strains; development of another mutant pool derived from a very early-heading variety; development of various introgression series carrying a chromosome segment of wild relatives in the O. sativa genetic background.

(4) Improvement of the integrated rice database "ORYZABASE" giving details of the plant materials and other scientific information; Updates with the latest information based on the above-described activities.

/rice/oryzabase