Agricultural Research Management Information System

Home
Research Summary
Search
About Us
- ARMIS
- Brochure
Contact Us
Report
User Request
Data Input
Help
- Operation Manual
  - PDF
  - Video
- Program Area & Commodity
We have reached 37600 number of research entries at this moment.

- Logout

Research Detail

Home
Research
Detail

Study of Combining Ability and Heterosis for Water Logging Tolerance Maize

Mohammad Quamrul Islam Matin
Scientific Officer
Plant Breeding Division, BARI, Gazipur

Abstract/ Executive Summary:

Combining ability for grain yield and yield components were evaluated in a 7×7 diallel fashion of water logged tolerant maize in normal condition. Significant general and specific combining ability variances were observed for some of the characters. The parental line W₃was found to be best general combiner for yield. The good combiner parents for different traits could be used in hybridization to improve yield as well as with desirable traits as donor parents for the accumulation of favorable genes. Among the studied hybrids, the crosses W₁xW₆ and W₄xW₅exhibited highest heterosis.

Keywords: Diallel, Grain yield. GCA, SCA

Location: Gazipur

Start Date: 00-00-2012

End Date: 00-00-2014

Program Area: Variety and Species

Commodity: Maize

Objectives:

To isolation for isolating superior inbred lines and better combining parents for suitable hybrids tolerant to excess soil moisture.

Methodology:

Seven water logged tolerant maize inbred lines were crossed in a diallel fashion excluding the reciprocals during the rabi season in 2012-2013. The resulting 21 F₁^’s and their were evaluated along with two checks (BARI hybrid maize 7, and NK40) in a alpha lattice design with three replications at the Bangladesh Agricultural Research Institute, Gazipur in the following rabi season of 2013- 2014. Each entry planted in single row of 5 m long plot. The spacing between row to row was 75 cm and plant to plant was 20 cm. One plant per hill was maintained after proper thinning. The plants were harvested on 3^rd May, 2014. Observations were recorded on ten randomly selected plants from each plot for plant height (cm), ear height (cm), ear length (cm), and 100-kernel weight (g). Days to silk, days to maturity and kernel yield were recorded on whole plot basis and yield was converted to ton/ha. Data were analyzed for variance for all the characters studied. General combining ability (GCA) and specific combining ability (SCA) were estimated following Model II, Method IV by R software.

Source of Information: Annual Research Report 2013-14, Plant Breeding Division, BARI, page: 86-91

Article Link (Online Journal):

Funding Source:

1. Government

Budget: Twenty thousand taka only

Total Budget (Tk.) : Twenty thousand taka only

Achievement/Findings:

Significant differences were observed for all the characters except ear length, days to maturity and 1000 grain weight, indicating sufficient genetic variability present among the materials. The magnitude of mean squares for GCA and SCA for studied characters indicated importance of both additive and non-additive components of genetic variance in controlling these traits. W₁, was good combiner having highly significant negative GCA effects both for plant and ear height. Good general combiners for major yield determining characters were W₃for earliness & W₁for dwarf plant type and longer ears. Parent W₃ the best general combiner for kernel yield and also possessed significant positive GCA effects for other yield components like number of kernels per ear. The overall study of GCA effects suggests that parent W₃ was a good general combiner for yield and W₂ and W₃for earliness while W₁for dwarf plant type. For days to silking, two crosses W₁xW₆_,andW₁xW₇exhibited significant negative SCA effects, For yield contributing traits, significant positive SCA effect was observed in three crosses such as W₁xW₆, W₁xW₇and W₂xW₃ for 1000 grain weight. Among the 21 F₁^’s nine crosses W₁xW₆, W₁xW₂, W₁xW₃, W₁xW₄, W₁xW₅, W₁xW₇, W₃xW₅, W₄xW₅ and W₆xW₇exhibited significant positive SCA effects for kernel yield. Against standard check BHM 7, heterosis for 1000-kernel weight was found highest (19.64%) in W₁xW₇followed by W₁xW₃, W₁xW₆, W₃xW_{4 ,}W₂xW₅and W₄xW₅. It showed that among the 21 F₁s, 2 crosses exhibited significant positive heterosis for kernel yield. The highest heterosis 15.64% was exhibited by the cross W₁xW₆ followed by W₄xW₅(8.54%).

Knowledge Management: Report/Proceedings