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 Studies in Maize

Mohammad Zahirul Alam Talukder
Scientific Officer
Plant Breeding Division, BARI, Gazipur

A.N. Md. Sajedul Karim
Scientific Officer
Plant Breeding Division, BARI, Gazipur

Dr. Salahuddin Ahmed
Principal Scientific Officer
Plant Breeding Division, BARI, Gazipur

Abstract/ Executive Summary:

Combining ability and heterosis was studied in 7 × 7 diallel cross in maize for grain yield and yield contributing characters. Significant general and specific combining ability variances were observed for all the characters studied. Significant estimates of GCA and SCA variances suggested the importance of both additive and non-additive gene actions for the expression studied traits. Parents P1 and P4 was excellent general combiner for earliness, P4 for short height and P4 and P6 for kernel weight. The parents P4 and P6 having good combining abilities for yield. Heterosis estimation was carried out using two commercial varieties NK40 and 900MG. When standard commercial check Nk40 was used, among the 21 F₁s, 3crosses exhibited significant positive heterosis for kernel yield. The highest heterosis was exhibited by the cross P4XP6 (12.43%), P6xP7 (10.89%) and P2xP3 (9.87%) respectively. When we compared with 900MG as check, among the 21 F₁s, none of the crosses exhibited significant positive heterosis for kernel yield. The highest heterosis was exhibited by the crosses P4XP6 (7.01%), P6xP7 (5.55%) and P2xP3 (4.57%). The crosses showing significant positive SCA values could be used for variety development after verifying them across the agro-ecological zones of Bangladesh.

Keywords: Combining ability, Heterosis, Maize

Location: BARI,Gazipur

Start Date: 00-00-2012

End Date: 00-00-2013

Program Area: Variety and Species

Commodity: Maize

Objectives:

To isolation superior inbred lines and better combining parents for suitable hybrids and determines percent of heterosis using standard commercial checks.

Methodology:

Seven diverse maize inbred lines were crossed in a diallel fashion excluding the reciprocals during the rabi season in 2012-13. The resulting 21 F₁^’s and their 7 parents were evaluated along with three checks (BARI hybrid maize 9, NK40 and 900MG) in a alpha lattice design with two replications at BARI, Gazipur in the following rabi season of 2013- 2014. Each entry planted in one rows of 5 m long plot. The spacing between rows was 75 cm and plant to plant distance was 20 cm. Intercultural operation and fertilizer were applied as recommend dose. General combining ability (GCA) and specific combining ability (SCA) wereestimated following Model I, Method II by R software.

Source of Information: Annual Research Report 2013-14, Plant Breeding Division, BARI, page: 78-85

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 days to maturity and 1000 kernel weight, indicating sufficient genetic variability present among the materials. The analysis of variance for general combining abilities (GCA) and specific combining abilities SCA) showed significant variations for all the characters except GCA of 1000 kernel weight. The variances due to SCA were higher than GCA for all character, which revealed the predominance of non additive gene action for controlling these traits. For days to tasseling and silking, negative estimates are considered desirable as those were observed to be associated with earliness and plant and ear height. The parents P1 and P4 showed negative GCA effects for this trait. Parents P4 and P6 were the best general combiner for kernel yield and also possessed significant positive GCA effect. The significant positive SCA crosses P1xP2, P2xP3, P3xP6, P4xP5, P4xP6, P4xP7, P5xP7 and P6xP7 involved parents with one or both the parents were related to good combiners, indicating GCA of the parental lines plays a key role for high yield. When standard commercial check was NK40, the percent heterosis for kernel yield varied from -51.39 to 12.53%. It showed that among the 21 F₁s, 3 crosses exhibited significant positive heterosis for kernel yield (Table 5). The highest heterosis 12.43% was exhibited by the cross P4xP6 followed by P6xP7 (10.89%) and P2xP3 (9.87%). When we estimated with 900MG as check, the percent heterosis for kernel yield varied from -53.73 to 7.01%. It showed that among the 21 F₁s, none crosses exhibited significant positive heterosis for kernel yield (Table 6). The highest heterosis 7.01% was exhibited by the cross P4xP6 followed by P6xP7 (5.5%) and P2xP3 (4.57%).

Knowledge Management: Report/Proceedings