Estimation of Genetic Parameters Controlling Inheritance of Maize Quantitative Traits under Different Plant Densities Using Line × Tester Analysis
Journal Title: Asian Journal of Advances in Agricultural Research - Year 2017, Vol 2, Issue 2
Abstract
Type of gene action, heritability and genetic advance from selection are prerequisites for starting a breeding program for developing plant density tolerant variety of maize. The objective of the present investigation was to estimate general (GCA) and specific (SCA) combining ability variances, type of gene action, heritability and genetic advance from selection for traits related to high density tolerance in maize. A split plot experiment with three replications was carried out; where plant densities were devoted to main plots, namely low (LD), medium (MD) and high (HD) density (47,600 to 71,400 and 95,200 plants/ha, respectively) and sub-plots to genotypes. A line x tester analysis was used. Both GCA and SCA variances were important in the expression of studied traits under all plant densities, but magnitude of δ2SCA was much higher than that of δ2GCA. Estimates of dominance (δ2D) genetic variance were appreciably larger than additive (δ2A) variance estimates for most studied traits under all plant densities, so the breeding method of choice for improving maize plant density tolerance would be heterosis breeding. The degree of dominance ‟a” was in the over-dominance range (a > 1) for most studied cases. The highest estimate of narrow sense heritability (88.15%) was shown by upper stem diameter (SDU) under MD followed by ears/plant (EPP) (83.85%) under LD, while the lowest estimate (0.00%) was shown by anthesis-silking interval (ASI) under LD and MD. The best environment in achieving the highest predicted gain from selection (GA%) was the HD environment for most studied traits followed by the LD environment for grain yield and its components. The highest GA under each environment was achieved by penetrated light at ear (PL-E) under low density (32.13%) and SDU under medium (31.73%) and high density (36.95%).
Authors and Affiliations
A. M. M. Al-Naggar, R. Shabana, M. S. Hassanein, T. A. Elewa, A. S. M. Younis, A. M. A. Metwally
Keywords
Related Articles
- EP ID EP337269
- DOI 10.9734/AJAAR/2017/36040
- Views 133
- Downloads 0
Confirmation of Proteins Encoding Genes Important in Bacterial Wilt Resistance
Background and Aim: Bacterial wilt caused by Ralstonia solanacearum is one of the most important soil borne plant pathogenic bacteria globally imparts decrease in crop yield per year. Situation can be improved by explori...
The Effect of Tannin-Containing Peanut Skin Supplementation on Drug-resistant Haemonchus contortus Control in Meat Goat
This study was to determine whether the phytochemical CT-containing peanut skin would have effects on animal performance and drug-resistant Haemonchus contortus control in meat goats or not. Twenty two Kiko-crossbreed in...
Isolation, Identification and Pathogenicity of Native Entomopathogenic Nematode Strains Collected from Hyderabad, Telangana State in India
Entomopathogenic nematodes (EPNs) are a promising alternative to integrated biocontrol control agent in many agricultural crop pests. Isolation and identification of indigenous species of entomopathogenic nematodes are n...
Sequence of Application Benomyl and Plant Extracts in the Control of Cowpea Anthracnose Caused by Colletotrichum lindemuthianum Sensu Lato
Field experiment was conducted to compare the efficacy of hot water extracts of Ricinus communis, Jatropha gossypifolia and Datura stramonium at three concentrations (65, 50 and 30%) with benomyl in the control of cowpea...
Nutritional Evaluation of a Wild Edible Fruit Mondia whitei (Hook .f.) Skeels Consumed by Some Human Populations in Izzi Clan, Ebonyi State, Nigeria
Mondia whitei fruit is consumed as a wild edible fruit by some human populations in Izzi land in Ebonyi State South-East Nigeria. There is dearth of information on its nutritional value, therefore a study was conducted b...