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Rice Germplasm Conservation and Management

Dr. Mohammad Khalequzzaman
PSO and Head
Genetic Resources and Seed Division (GRSD), BRRI, Gazipur

Mir Sharf Uddin Ahmed
SSO
Genetic Resources and Seed Division (GRS), BRRI, Gazipur

Abstract/ Executive Summary:

A total of 333 of which 30 Aus/Jhum, 264 Aman and 39 Boro rice germplasm were collected from different districts including hilly areas of Bangladesh. A total of 1607 germplasm accessions including 109 new collections were grown for rejuvenation in three rice growing seasons. Among 429 germplasm, 207 accessions in T. Aman 2011 and 222 in Boro 2011-12 were characterized on the bases of 45 morpho-agronomic traits. A total of 2036 accessions of which 342 accessions in Aus, 1714 in T. Aman and 577 accessions in Boro seasons were processed and stored in short and medium-term and long term storages. The seed of the old accessions were stored in their respective places. Among the above mentioned accessions, a total of 99 accessions have been stored in long term genebank and 712 accessions have been stored in medium term genebank during the reporting year. A total of 273 germplasm were registered as new accession stored both in short and medium term storages. Among 273 accessions, 7 accessions in Aus, 243 in T. Aman 2011 and 23 accessions in Boro 2011-12 were processed and stored in genebank.

Keywords: Rice, Germplasm, Conservation and management

Location: Genetic Resources and Seed division, BRRI, Gazipur.

Start Date: 01-07-2011

End Date: 30-06-2012

Program Area: Variety and Species

Commodity: Rice

Objectives:

To collect traditional/exotic and wild rice varieties and conserve in the Genebank of BRRI.
To increase the seed for characterization and storage.
To characterize and evaluate the stored as well as new collection of rice germplasm
To keep the rice germplasm with respective accession number in the medium and short-term storages of Genebank after sorting duplicate.
To check and monitor the germination (%) of the stored germplasm. 6.To supply rice germplasm and to exchange germplasm (if possible) with national/international organizations.
To identify the close and distant varieties based on their yield components and geographic distribution.

Methodology:

1. For germplasm collection, mission oriented collection programs were prepared. For this purpose DAE and NGO personnel were informed well ahead to help BRRI scientists for arrangement of logistic support in field collection. Some collection missions were made directly by BRRI personnel. 2. For rejuvenation, the accessions which possessed less than 80% germination and stored before 2008, were grown in T. Aman 2011 and Boro 2011-12 seasons. 3.For characterization, a total of 429 germplasm accessions were grown in T. Aman and Boro seasons for evaluation using the rice germplasm descriptors and evaluation form. 4. A total of 2036 germplasm including 109 new collections were grown for seed increase and rejuvenation during Aus, T. Aman 2011 and Boro 2011-2012. 5. The new collections with more than 80% germination were registered as accession after cross checking with the seed and card catalogues to avoid duplication and seed mixture. Then at least 150 g seed of each variety were kept in the glass jar containing fresh silica gel in short term storage and another at least 150 g seed were kept in aluminium foil and stored in airtight glass jar for medium and long term storage. 6. A total of 38 traditional hilly rice germplasm were grown under transplanted condition. Morpho-agronomic and yield contributing data were recorded to study the diversity. Mahalonobis’ D² and Canonical Vector Analysis methods were used to group the varieties based on their yield contributing characters. 7.Always germplasm were grown under transplanted conditions and in line sowing using single row of 5.4 m long per entry and single seedling per hill with a spacing of 25 X 20 cm between rows and plants, respectively. Fertilizers were applied @ 60:60:40 kg NPK/ha in T. Aman and Aus and @ 80:60:40 kg NPK/ha in Boro season. Proper control measures were taken for pests, diseases and weeds when necessary.

Source of Information: BRRI Annual Report 2011-12

Article Link (Online Journal):

Funding Source:

1. Government

Budget: 3000000

Total Budget (Tk.) : 3000000

Achievement/Findings:

A total of 333 rice germplasm were collected from different districts including hilly areas of Bangladesh. A total of 429 germplasm were characterized with 45 morpho-agronomic characters during T. Aman and Boro seasons. Besides, 1607 germplasm accessions including 109 new collections were rejuvenated during the reporting year. Apart from this, 82 new collections were registered as accession. Genebank database preparation is going on and about 100 accessions have been entered into the database with available information during reporting year. Genetic diversity was pronounced in 38 traditional hilly rice germplasm and the varieties were grouped into five (5) clusters. Among the ten tested germplasm, three germplasm viz: Joli, Rangpuri (sada) and Mi-chocho have allelopathic potentialities and more inhibitory character to suppress weeds in laboratory condition. Fifty three materials were screened against gall midge. Among the tested three hundred ninety eight landraces, sixty seven materials found highly resistant against Bacterial blight. Among the tested 98 genotypes for submergence tolerance, 9 genotypes were found very good recovery status which survivability score 3, 28 genotypes were found good recovery status which survivability score 5, 35 genotypes were found fair recovery status which survivability score 7 and 26 genotypes were found poor recovery status which survivability score 9; and in another study among the tested 100 genotypes, 25 genotypes were found better which survivability ranges from 92-100% and survivability score 3.

Knowledge Management: Report/Proceedings