Assessment of heterotic patterns of tropical low‐nitrogen–tolerant maize (<i>Zea mays</i>L.) inbred lines using testcross performance, morphological traits and SNP markers

Ajala, S. O.; Olayiwola, M. O.; Job, Anthony Oluwatoyosi; Olaniyan, Amudalat Bolanle; Gedil, Melaku

doi:10.1111/pbr.12866

Cited by 6 publications

(1 citation statement)

References 29 publications

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“…The considerable variation found might be attributed to differences in soil and climatic conditions between the two locations. Similar findings were reported by other studies, such as Ajala et al (2020). The interplay of genotype and environment has frequently been characterized as persistent differences between genotypes from one environment to another.…”

Section: Discussionsupporting

confidence: 89%

Partial Resistance of Late Wilt Disease Caused by Magnaporthiopsis maydis in Certain Egyptian Maize Hybrids

Abdelghany,

EL-Sayed,

Kafsheer

et al. 2023

Egyptian Journal of Phytopathology

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Late wilt, triggered by Magnaporthiopsis maydis, is threatening maize productivity in temperate countries. The disease is mostly managed by genetic resistance, which is frequently exhibited partially in the field. Fifteen maize hybrids were investigated for their partial resistance to late wilt disease in two Agricultural Research Stations, Gemmeiza and Sids in the 2021 and 2022 growing seasons. Two epidemiological parameters were used to characterize this type of resistance in the examined maize hybrids at the adult plant stage: final disease incidence (FDI%) and area under disease progress curve (AUDPC). The hybrids HYTECH-TWC1100, PIONEER-SC30K9, and HYTECH-SC2031 exhibited slower disease progression (less than 7.67%) throughout the plant cycle in all trials compared with the check hybrid Boushy (above 54.63%). The genetic composition of the examined maize hybrids was responsible for more than 80% of the variability in how the hybrids responded to late wilt. In the changes of FDI (%) and AUDPC, the relative contribution of the environment (locations) was relatively low (less than 1%). Due to strong heritability estimates (up to 99%) and high values of genetic progress of more than 80% of the two parameters under the 2021 and 2022 growing seasons, the phenotypic changes were attributed to the genetic structures of the genotypes. The agronomic characteristics of the evaluated hybrids demonstrated a significant positive relationship between LWD resistance and grain yield per plant, as well as hundred kernel weight, plant height, and ear length. The principal component analysis demonstrated the significance of FDI (%) and 100 kernel weight as appropriate evidence for assessing these materials for late wilt disease.

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Section: Discussionsupporting

confidence: 89%

Partial Resistance of Late Wilt Disease Caused by Magnaporthiopsis maydis in Certain Egyptian Maize Hybrids

Abdelghany,

EL-Sayed,

Kafsheer

et al. 2023

Egyptian Journal of Phytopathology

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Elucidating molecular diversity and grouping of Indian maize (Zea mays L.) inbred lines using SNP markers

Madankar,

Shahi,

Singh

et al. 2023

CEREAL RESEARCH COMMUNICATIONS

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Classification of maize inbred lines into heterotic groups based on yield and yield attributing traits

Bhatla,

Angidi,

Thomas

et al. 2024

Plant Genet. Resour.

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This study investigated the combining ability, heterosis and heterotic grouping of maize (Zea mays L.) inbred lines to enhance hybrid performance and productivity. Twenty-four hybrids were developed by crossing eight inbred lines with three testers, and their performance was evaluated for two years at Banaras Hindu University's agricultural research farm. Data on yield and yield-attributing traits were collected from selectively centred competitive plants in each row, avoiding border plants to reduce errors. Biometrical techniques, cluster analysis, and statistical tools were employed to measure general combining ability (GCA), specific combining ability (SCA), and standard heterosis, providing insights into hybrid performance. Analysis of variance revealed significant mean square values for GCA and SCA across most traits studied. Various methods were utilized, including SCA effects, HGCAMT (Heterosis Grouping by Combining Ability of Multiple Traits), and HSGCA (Heterotic Grouping based on Specific and General Combining Ability). The study identified HUZM-242 × CML-286 and HUZM-53 × CML-286 as crosses displaying higher grain yield compared to the check line DKC 7074 and exhibiting positive heterosis. The findings offer valuable guidance for maize breeding programmes by accurately identifying heterotic groups, enabling breeders to select inbred lines more likely to produce high-performing hybrids. This targeted selection reduces the number of necessary cross-breeding trials, saving time and resources. Additionally, hybrids derived from crosses between lines from different heterotic groups exhibit superior performance due to higher heterosis. These conclusions support advancements in maize breeding strategies, ultimately contributing to agricultural sustainability through increased productivity, resource efficiency, and economic benefits for farmers.

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Assessment of heterotic patterns of tropical low‐nitrogen–tolerant maize (Zea maysL.) inbred lines using testcross performance, morphological traits and SNP markers

Cited by 6 publications

References 29 publications

Partial Resistance of Late Wilt Disease Caused by Magnaporthiopsis maydis in Certain Egyptian Maize Hybrids

Partial Resistance of Late Wilt Disease Caused by Magnaporthiopsis maydis in Certain Egyptian Maize Hybrids

Elucidating molecular diversity and grouping of Indian maize (Zea mays L.) inbred lines using SNP markers

Classification of maize inbred lines into heterotic groups based on yield and yield attributing traits

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