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Back Cross Nursery During Boro Seasons of 2010-2011

Dr. Md. Jamil Hasan
Principal Scientific Officer
Hybrid Rice Division Bangladesh Rice Research Institute Gazipur-1701

Umma Kulsum
Scientific Officer
Hybrid Rice Division Bangladesh Rice Research Institute Gazipur-1701

Abstract/ Executive Summary:

Conversion of suspected CMS lines into new CMS lines is done in back cross nursery. New CMS lines are developed in this nursery in the back ground of elite maintainer lines. Up to BC₆ generations conversion are made if the suspected CMS line expressed complete sterility as well as possess good agronomic features. It is then shifted to CMS maintenance and evaluation nursery as new CMS lines.Out of thirty seven (37) BC₅ generations thirty five (35) were found stable in pollen sterility and other desirable agronomic characteristics and advanced as BC₆ generation. In case of BC₄ generations all entries were advanced as BC₅ based on pollen sterility status and other desirable agronomic characteristics. Two BC₃ generations were discarded due to lack of completely sterility criteria and rest three was advanced as BC₄ generations. All BC₂entries were advanced as BC₃ generations for stable pollen sterility and other agronomic characters. Seven BC₁ generations out of nine were advanced for next generation.

Keywords: Back cross, CMS and Maintainer lines

Location: BRRI HQ, Gazipur

Start Date: 23-11-2010

End Date: 31-05-2011

Program Area: Variety and Species

Commodity: Rice

Objectives:

Developing CMS lines from identified maintainer by back crossing.

Methodology:

Materials: 37 BC₅, 8 BC₄_, 5 BC₃, 14 BC₂ and 9 BC₁ generations Successive back cross progenies ranging from BC1-BC5 were grown along with their corresponding suspected maintainer lines. Pollen fertility of each of the plant in a line was evaluated. Completely sterile plants were immediately crossed with its corresponding male parents for generation advancement. Adequate soil fertility was ensured by applying additional quantities of Urea- TSP-MP- Gypsum- ZnSO₄@ 270:130:120:70:10 kg/ha, respectively. Total TSP, MP, Gypsum and ZnSO₄were applied in final land preparation. Total Urea was applied in four installments, 1/4 ^th at final land preparation, 1/4^th at 15-20 days after transplanting (DAT), 1/4^th at 35-40 days after transplanting (DAT) and the rest before panicle initiation (PI) stage. Irrigation and weeding was done when necessary

Source of Information: BRRI Annual Report 2010-2011, page no. 13 & 14, BRRI, Gazipur-1701, Bangladesh

Article Link (Online Journal):

Funding Source:

1. Government

Budget: 30000/-

Total Budget (Tk.) : 30000/-

Achievement/Findings:

Out of thirty seven (37) BC₅ generations thirty five (35) were found stable in pollen sterility and other desirable agronomic characteristics and advanced as BC₆ generation. In case of BC₄ generations all entries were advanced as BC₅ based on pollen sterility status and other desirable agronomic characteristics. Two BC₃ generations were discarded due to lack of completely sterility criteria and rest three was advanced as BC₄ generations. All BC₂entries were advanced as BC₃ generations for stable pollen sterility and other agronomic characters. Seven BC₁ generations out of nine were advanced for next generations.

Knowledge Management: Report/Proceedings