Yield and combining ability of temperate ex-PVP introgressed and tropical maize under contrasting moisture regimes
Isaiah Aleri, Manje Gowda, Andrew Chavangi, Juan Burgueno, Yoseph Beyene, Mehdi Rahimi, Prasanta Subudhi, Prasanta Subudhi
TL;DR
This study explores how temperate maize lines can improve tropical maize yields and drought resilience in Sub-Saharan Africa.
Contribution
The study introduces the use of ex-PVP temperate maize lines to enhance tropical maize hybrids under drought conditions.
Findings
Temperate introgression improved yield in tropical backgrounds under optimal conditions.
Hybrids from temperate lines performed similarly to tropical hybrids under drought stress.
Lines L2, L10, L16 and testers T1-T4, T7 showed strong general combining ability for yield and drought tolerance.
Abstract
Low grain yield and recurrent drought remain major constraints to maize production in Sub-Saharan Africa (SSA), underscoring the urgent need for hybrids with improved resilience. The use of ex-PVP (expired Plant Variety Protection) temperate maize lines is important to improve yield potential and genetic diversity in tropical adapted lines. In this study, 15 temperate introgressed lines and 6 tropical lines were crossed with eight single cross testers to generate 168 testcross hybrids. All genotypes were evaluated in 8 sites, with 6 well-watered (WW) and 2 drought-stressed (DS) conditions in Kenya. Analysis showed significant genotypic and site effects for grain yield (GY) and other agronomic traits, with strong genotype × environment interactions under drought. General combining ability (GCA) and specific combining ability (SCA) were important, with additive variance dominating under…
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Taxonomy
TopicsGenetics and Plant Breeding · Crop Yield and Soil Fertility · Climate change impacts on agriculture