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Evaluation of Association Mapping Test-crosses Under Water-logging Stress (set I: Caameh-11, Set Ii: Caameh-21, Set Iii: Caamlh-11, Set Iv: Caamlh-21, Set V: Caammh-11 and Set Vi: Caammh-21)

Dr. Salahuddin Ahmed
Pricipal Scientific Officer
Plant Breeding Divison, BARI, Gazipur

M. Z.A. Talukder
Scientific Officer
Plant Breeding Divison, BARI, Gazipur

A. N. M. S. Karim
Scientific Officer
Plant Breeding Divison, BARI, Gazipur

Abstract/ Executive Summary:

Six sets of trials comprised of 728 test cross maize hybrids were evaluated at Gazipur during August 2013 to December 2013 with the aim to select excess soil moisture tolerant maize hybrids suitable for Bangladesh condition. After continuous waterlogging for 7 days with a ponding depth of 10-15 cm at knee high stage except a few almost all the plants in all the trials did not survive. The survived 2 entries viz 113 and 226 from trial CAAMLH-11; entry 15 from CAAMLH-21 and 8 entries viz.18, 51, 68, 87, 139, 196, 198 and 254 from trial CAAMMH-11 will further be evaluated in waterlogging condition to verify the results. The survived plants exhibited brace roots and surface roots but most of the plants did not produce grains.

Keywords: Association mapping, Test-crosses, Water-logging stress, Maize

Location: Gazipur

Start Date: 00-08-2013

End Date: 00-12-2013

Program Area: Variety and Species

Commodity: Maize

Objectives:

To identify waterlogged tolerant maize hybrid(s) for sustainable production for the problem areas in Bangladesh.

Methodology:

The experiment was conducted at Gazipur during August 2013 to December 2013 to evaluate six sets of trials comprised of 728 test cross maize hybrids(CAAMEH-11:140 entries (NK-40 and Pioneer as checks); CAAMEH-21:45 entries (NK-40, Pioneer and Pacific-60 as checks);CAAMLH-11: 245 entries (NK-40, Pioneer and 900 M Gold as checks);CAAMLH-21:15 entries (NK-40, Pioneer, BHM-9, 900 M Gold, Pacific-60 and Pacific-740 as checks) ;CAAMMH-11:265 entries (NK-40, Pioneer and 900 M Gold as checks) and CAAMMH-21:18 entries (NK-40, Pioneer and 900 M Gold as checks). Seeds were sown on 26 August at Gazipur following alpha lattice with 3 replications. The unit plot size was 3.0 m × 0.75 m. Spacing adopted was 60 cm × 20 cm between rows and hill, respectively. Intercultural operation and fertilizer were applied as recommended doses. Strong bands were constructed around each plot to impose the water logging. Water was applied continuous for 7 days with a ponding depth of 10-15 cm at knee high stage (7-8 leaf stage). Seven days after release of water observation was made on No. of surviving plants/plot, No. of dead plants/plot, No. of lodged plant/plot (recorded with in the surviving plants), Number of nodes bearing Brace root (count the number of aboveground nodes bearing brace root), Number of plants having surface root (thin fine roots develop at the surface of the soils after the water logging) in each plot, Senescence (1-10 scale, 1 = 10% leaf senescence from base of the plant, and 10 = 100% leaf senescence.

Source of Information: Annual Research Report 2013-14, Plant Breeding Division, BARI, page: 165-166

Article Link (Online Journal):

Funding Source:

1. Government

Budget: Fifty thousand taka

Total Budget (Tk.) : Fifty thousand taka

Achievement/Findings:

After continuous water logging for 7 days except a few almost all the plants in all the trials did not survive. Only few entries of three trial produced grains in varying numbers. The survived 2 entries viz 113 and 226 (VH12209 and VH111739) from trial CAAMLH-11; one entry 15(30V92) from trial CAAMLH-21 and 8 entries viz.18, 51, 68, 87, 139, 196, 198 and 254 (VH1251, VH1251, VH121339, VH12304, VH112997, VH123040, VH121100 and VH112938) from trial CAAMMH-11 will further be evaluated in waterlogging condition to verify the results.

Knowledge Management: Report/Proceedings