Genetic resources and breeding of maize for Striga resistance: a review

Dossa, Emeline N.; Shimelis, Hussein; Mrema, Emmanuel; Shayanowako, Admire; Laing, Mark

doi:10.3389/fpls.2023.1163785

Cited by 3 publications

(1 citation statement)

References 229 publications

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“…Breeding for Striga resistance involves challenging crop germplasm with Striga, identifying and selecting the best performing genotypes in the pool through effective screening methods (Dossa et al, 2023). The level of resistivity or susceptibility of Striga is determined by Striga counts and the extent of damage to the crop in breeding plots.…”

Section: Striga Resistance In Maizementioning

confidence: 99%

High-Yielding Striga Resistant Maize (Zea Mays L.) Hybrids: A Review

Jatto,

Juraimi,

Rafii

et al. 2024

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Striga hermonthica (Del) Benth is an obnoxious parasitic weed that constitutes one of the devastating constraints in maize production. Many efforts have been made by crop protectionists, weed scientists, and agronomists using different methods to stem this obnoxious weed, however, these have yielded little or no positive results. Developing resistant hybrid host cultivars could have a major impact in reducing crop loss due to Striga. Though, the West and Central Africa Maize Network (WECAMAN) and IITA developed some maize varieties or hybrids that combine earliness or extra-earliness with resistance to Striga hermonthica through conventional breeding. Selection of parental lines from new source populations with different heterotic groups and appropriate breeding schemes becomes imperative to developing superior hybrids and breeding populations for Striga resistance. Combining ability analysis allows unbiased estimation of genetic parameters. Diallel mating design statistically separates parents and progenies performance into GCA and SCA components. This method offers a more effective method of developing high-yielding Striga resistance hybrid(s) in maize by crossing between Striga-resistant inbred lines and high-yielding but susceptible inbred lines from amongst the pools of parental lines in different heterotic groups.

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Section: Striga Resistance In Maizementioning

confidence: 99%

High-Yielding Striga Resistant Maize (Zea Mays L.) Hybrids: A Review

Jatto,

Juraimi,

Rafii

et al. 2024

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Screening tropical and sub-tropical maize germplasm for resistance to Striga hermonthica and S. asiatica and yield-related traits

Dossa,

Shimelis,

Shayanowako

et al. 2024

Euphytica

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Identification of maize germplasm with dual resistance to Striga hermonthica (Sh) and S. asiatica (Sa), could lead to the development of cultivars with stable resistance. 130 tropical and sub-tropical maize germplasms, including checks, were evaluated in a controlled environment for their reaction to Sh and Sa infestations using a 13 × 10 alpha lattice design with two replications over two seasons. Significant differences (P < 0.05) were detected among the assessed genotypes for all the recorded traits in Sh and Sa-infested treatments. Under Sa-infested conditions, mean Striga emergence counts 8 weeks after planting (SEC8) and 10 weeks after planting (SEC10) were 5.00 and 45.50, respectively, while the mean Striga damage rate 8 weeks after planting (SDR8) and 10 weeks after planting (SDR10) were 3.35 and 3.07, respectively. Under Sh-infested conditions, SEC8 and SEC10 mean values were 3.66 and 3.77, respectively, while the SDR8 and SDR10 values were 5.25 and 2.75 respectively. Positive and significant (P < 0.05) correlations were found between anthesis-silking interval (ASI) and SDR8 (r = 0.18) and SDR10 (0.32) under Sa-infested conditions. Negative and significant correlations were recorded between ear per plant (EPP) and SEC8, SDR8, and SDR10, with r = − 0.18, r = − 0.27, and r = − 0.24, respectively. Under Sh-infested conditions, significant and negative correlations were recorded between SDR8 and EPP (r = − 0. 20), EHT and SEC8 (r = − 0.22), EHT and SDR8 (r = − 0.36), PLHT and SDR8 (− 0.48), and PLHT and SDR10 (− 0.22). The results suggest that dual resistance to the two Striga species exists in some tropical and sub-tropical maize lines. The following genotypes have dual resistance to Sa and Sh: CML440, CML566, CML540, CML539, CLHP0343, CLHP0326, TZISTR1248, TZSTRI115, TZISTR25, TZISTR1205, TZSTRI113, TZISTR1119, TZISTR1174 and the OPVs B.King/1421, Shesha/1421, ZM1421, DTSTR-W SYN13, DTSTR-Y SYN14, and 2*TZECOMP3DT/WhiteDTSTRSYN) C2. The identified genotypes are suitable for use as parents in developing high-performing maize varieties with Striga resistance and improved grain yield.

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Genetic diversity analysis of tropical and sub-tropical maize germplasm for Striga resistance and agronomic traits with SNP markers

Dossa,

Shimelis,

Shayanowako

2024

PLoS ONE

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Striga hermonthica (Sh) and S. asiatica (Sa) are major parasitic weeds limiting cereal crop production and productivity in sub-Saharan Africa (SSA). Under severe infestation, Striga causes yield losses of up to 100%. Breeding for Striga-resistant maize varieties is the most effective and economical approach to controlling the parasite. Well-characterized and genetically differentiated maize germplasm is vital to developing inbred lines, hybrids, and synthetic varieties with Striga resistance and desirable product profiles. The objective of this study was to determine the genetic diversity of 130 tropical and sub-tropical maize inbred lines, hybrids, and open-pollinated varieties germplasm using phenotypic traits and single nucleotide polymorphism (SNP) markers to select Striga-resistant and complementary genotypes for breeding. The test genotypes were phenotyped with Sh and Sa infestations using a 13x10 alpha lattice design with two replications. Agro-morphological traits and Striga-resistance damage parameters were recorded under a controlled environment. Further, high-density Diversity Array Technology Sequencing-derived SNP markers were used to profile the test genotypes. Significant phenotypic differences (P<0.001) were detected among the assessed genotypes for the assessed traits. The SNP markers revealed mean gene diversity and polymorphic information content of 0.34 and 0.44, respectively, supporting the phenotypic variation of the test genotypes. Higher significant variation was recorded within populations (85%) than between populations using the analysis of molecular variance. The Structure analysis allocated the test genotypes into eight major clusters (K = 8) in concordance with the principal coordinate analysis (PCoA). The following genetically distant inbred lines were selected, displaying good agronomic performance and Sa and Sh resistance: CML540, TZISTR25, TZISTR1248, CLHP0303, TZISTR1174, TZSTRI113, TZDEEI50, TZSTRI115, CML539, TZISTR1015, CZL99017, CML451, CML566, CLHP0343 and CML440. Genetically diverse and complementary lines were selected among the tropical and sub-tropical maize populations that will facilitate the breeding of maize varieties with Striga resistance and market-preferred traits.

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Genetic resources and breeding of maize for Striga resistance: a review

Cited by 3 publications

References 229 publications

High-Yielding Striga Resistant Maize (Zea Mays L.) Hybrids: A Review

High-Yielding Striga Resistant Maize (Zea Mays L.) Hybrids: A Review

Screening tropical and sub-tropical maize germplasm for resistance to Striga hermonthica and S. asiatica and yield-related traits

Genetic diversity analysis of tropical and sub-tropical maize germplasm for Striga resistance and agronomic traits with SNP markers

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