Secondary Traits and Selection Environment of Plant Density Tolerance in Maize Inbreds and Testcrosses
Journal Title: Journal of Advances in Biology & Biotechnology - Year 2017, Vol 14, Issue 3
Abstract
Secondary traits in maize are used in screening programs for selecting tolerant genotypes to a specific abiotic stress. Indirect selection would be effective if heritability of the secondary trait is greater than that of the primary trait and correlation between them is substantial. The objectives of the present investigation were to identify secondary trait(s) for plant density tolerance (PDT) in maize and to identify the best selection environment for improving traits related to plant density tolerance. Testcrosses were produced between 23 inbreds and 3 testers. Evaluation of 69 testcrosses and 23 inbreds for 30 traits was carried out in 2016 season under 3 plant densities using a split plot design in 3 replications. Under high density (HD), out of 30 traits, favorable and significant correlation coefficients (r) were exhibited between stress tolerance index (STI) and 23 traits of testcrosses (all 7 yield traits, all 9 tassel traits, penetrated light at ear (PL-E), penetrated light at bottom (PL-B), chlorophyll concentration index (CCI), lower stem diameter (SDL), upper stem diameter (SDU), ear leaf area (ELA), and barren stalks (BS). Based on high (r), high heritability and high genetic advance estimates, it is evident that the secondary traits for plant density tolerance in our study were grain yield/plant, grain yield/ha, kernels/plant, kernels/row, rows/ear, ears/plant, SDU, ELA, plant height, tassel dry weight, central spike length, and branch length. The best environment in achieving the highest predicted gain from selection was low density for 8 traits (grain yield/plant, grain yield/ha, 100-kernel weight, kernels/plant, ears/plant, tassel branch number, total spike length and PL-E), medium density for 4 traits (DTS, ear height, SDL and CCI) and HD for the rest of studied traits. These traits could be used by maize breeder as selection criteria for improving PDT.
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 EP318203
- DOI 10.9734/JABB/2017/35510
- Views 108
- Downloads 0
Comparative Assessment of Pleurotus sajor-caju (Oyster Mushroom) Yield Cultivated from Indigenous and Exotic Wood Wastes
The study assessed the yield of Pleurotus sajor-caju cultivated from the sawdust of four wood species: Triplochiton scleroxylon and Ceiba petandra (indigenous tree species), Gmelina arborea and Tectona grandis (exotic tr...
Gastroprotective, Antioxidant and Antibacterial Properties of the Aqueous Root Bark Extract of Cassia arereh Del. (Caesalpiniaceae) in a Wistar Rat Model
Aims: The objective of this study is to evaluate gastric cytoprotective, antioxidant and antibacterial properties of aqueous root bark extract of Cassia arereh (AECA). Place and Duration of Study: Department of Biologica...
PDMS Flow Cell for Monitoring Bacterial Adhesion Capacity of Escherichia coli O157:H7 in Beverages
Aims: To develop and standardize a polydimethylsiloxane (PDMS) flow cells for monitoring bacterial adhesion capacity of biofilm formation by Escherichia coli O157:H7 in Beverages industry. Study Design: PDMS chip was fa...
Biotechnology as a Cradle of Scientific Development: A Review on Historical Perspective
Historically, the science of biotechnology started through domestication of plants and animals by early men and selective plant breeding which subsequently led to transgenesis. Fermentation of grains and fruits using yea...
Phytochemical Composition and Analgesic Property of Ethanolic Leaf Extract of Maesobotrya barteri
Aim: This study was carried out to identify the phytochemical composition of Maesobotrya barteri, and effect on infra-red induced pain in mice. Methodology: Twenty albino mice were selected and randomly placed in 5 group...