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 135
- Downloads 0
Nutritonal Properties of Composite Flour (Blends of Rice (Oryza sativa), Acha (Digitaria exilis) and Soybeans (Glycine max) and Sensory Properties of Noodles Produced from the Flour
This study was carried out to evaluate the nutritional properties of composite flour made from rice, acha, soy beans and wheat, and to assess the sensory acceptability of the noodles made from the composite flour. Differ...
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...
Impact of Citric Acid, Ascorbic Acid and Some Nutrients (Folifert, Potaqueen) on Fruit Yield and Quality of Washington Navel Orange Trees
The present study was conducted on 11-year-old Washington navel orange trees budded on sour orange rootstock grown in loamy sand soil under surface irrigation system at a private orchard at Manzala village, Toukh region,...
Drought tolerance of Five Quinoa (Chenopodium quinoa Willd.) Genotypes and Its Association with Other Traits under Moderate and Severe Drought Stress
There are genotypic differences in drought tolerance (DT) among quinoa (Chenopodium quinoa) cultivars, and most of the known mechanisms of drought tolerance are encountered in this species. The objectives of the present...
Optimum pH Value for Improving Postharvest Characteristics and Extending Vase Life of Rosa hybrida cv. Tereasa Cut Flowers
This experiment was conducted on cut Rosa hybrida L. (cv. Tereasa) during two summer seasons; 2015 and 2016 at the laboratory of the Ornamental Horticulture Department, Faculty of Agriculture, Cairo University. Stems of...