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Screening of Maize Inbreed Lines Under Drought Stress at Reproductive Stage

M.T. Rahman
SO
Agronomy Division, BARI, Gazipur

F. Ahmed
SSO
Agronomy Division, BARI, Gazipur

Abstract/ Executive Summary:

A field experiment was conducted on drought stress effect on maize inbreed lines at reproductive stage to find out the tolerant lines against drought. Sixteen inbreed lines namely; CML144, CML150, CML159, CML202, CML251, CML376, CML395, CML444, CML448, CML456, CML488, CML491, CML498, CML503 CML505 and CML511 were evaluated in the present study. Leaf area, yield components and yield of inbreed lines were greatly affected by drought stress at reproductive stage. Leaf area/plant of CML488, CML395, CML251, CML202 and CML505 were less affected by drought compared to others. Among the inbreed lines, grain yield/plant under drought condition was higher in CML395, CML144, CML150, CML251 and CML505 compared to other lines. Relative yield of CML 395, CML251, CML150, CML456, CML505 and CML144 were higher than others. Stress tolerance index (STI) of CML395, CML144, CML505 and CML251 were higher than others.Considering the above parameters, CML395, CML251, CML150, CML144, CML505 and CML498 was found promising against drought at reproductive stage.

Keywords: Screening, Maize inbreed lines, Drought stress, Reproductive stage

Location: Joydebpur, Gazipur

Start Date: 17-11-2011

End Date: 15-04-2012

Program Area: Variety and Species

Commodity: Maize

Objectives:

To find out suitable variety/ inbred lines under drought stress at reproductive stage.

Methodology:

The experiment was conducted at the research field of Agronomy Division, BARI, Joydebpur, Gazipur during rabi season of 2011-2012. The soil belongs to the Chhiata Series under Agro-Ecological Zone-28. The soil was slightly clay loam and acidic in nature (pH 6.1). Sixteen maize Inbreed lines, CML 144, CML 150, CML 159, CML 202, CML 251, CML 376, CML 395, CML 444, CML 448, CML 456, CML 488, CML 491, CML 498, CML 503 and CML 511were tested under irrigated and drought conditions. The drought was imposed at reproductive stage (from 64 DAS to maturity) by withdrawing irrigation water.The unit plot size was 3 m x 4.2 m. Seeds were sown on November 17, 2011. There were 3m long 4 lines of inbreed along with 3 lines of BARI Maize 5 as border row. Fertilizers were applied at the rate of 250-55-100-30 kg/ha N, P, K and S as urea, triple super phosphate (TSP), muriate of potash (MoP) and gypsum. One third of N, whole amount of TSP, MoP and gypsum was applied as basal. Remaining 2/3 N was top-dressed at 35 and 70 days after sowing (DAS).

Source of Information: Annual Report, Agronomy Division 2011-2012, BARI

Article Link (Online Journal):

Funding Source:

1. Asian Development Bank

Budget: 20,000/-

Total Budget (Tk.) : 20,000/-

Achievement/Findings:

Results revealed that CML395, CML251, CML150, CML448, CML144, CML505 and CML498 are less susceptible to drought at reproductive stage compared to other inbreed lines.

Knowledge Management: Report/Proceedings