Enhancing Drought Tolerance and <i>Striga hermonthica</i> Resistance in Maize Using Newly Derived Inbred Lines from the Wild Maize Relative, <i>Zea diploperennis</i>
Recurrent drought and <i>Striga hermonthica</i> (Del.) Benth parasitism constrains maize production in sub-Saharan Africa (SSA). Transfer of resistance genes from wild relatives can improve resistance to drought and <i>Striga</i> in tropical maize. The objectives of this stud...
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MDPI AG
2021-01-01
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| Series: | Agronomy |
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| Online Access: | https://www.mdpi.com/2073-4395/11/1/177 |
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| author | Abdulwahab S. Shaibu Baffour Badu-Apraku Monininuola A. Ayo-Vaughan |
| author_facet | Abdulwahab S. Shaibu Baffour Badu-Apraku Monininuola A. Ayo-Vaughan |
| author_sort | Abdulwahab S. Shaibu |
| collection | DOAJ |
| description | Recurrent drought and <i>Striga hermonthica</i> (Del.) Benth parasitism constrains maize production in sub-Saharan Africa (SSA). Transfer of resistance genes from wild relatives can improve resistance to drought and <i>Striga</i> in tropical maize. The objectives of this study were to (i) determine the combining ability of 12 extra-early yellow maize inbreds derived from <i>Zea diploperennis</i> and tropical maize germplasm; (ii) classify the inbreds into heterotic groups using heterotic grouping based on the general combining ability (GCA) of multiple traits (HGCAMT) method; (iii) examine hybrid performance under contrasting environments; and (iv) examine the stability of hybrid combinations involving the inbreds. Sixty-six diallel crosses involving the inbreds plus four checks were evaluated for two years under drought, <i>Striga</i>-infested and rainfed environments in Nigeria. Significant differences (<i>p</i> < 0.05) were observed for the effects of genotype, environment, genotype × environment, GCA and specific combining ability (SCA) on grain yield and other measured traits. Inbred lines such as TZdEEI 7 × TZEEI 63 derived from <i>Z. diploperennis</i> and tropical germplasm exceeded the checks by a range of 28 to 41%. Across environments, the hybrid TZdEEI 1 × TZdEEI 7, which was derived from <i>Z. diploperennis</i>, was the highest-yielding with a grain yield of 4302 kg ha<sup>−1</sup>. The results revealed the predominance of GCA over SCA effects for most measured traits, suggesting that additive gene action governed the inheritance of <i>Striga</i> resistance and drought tolerance related traits in the inbreds. The 12 inbreds were classified into three heterotic groups, while TZEEI 79 and TZdEEI 7 were identified as inbred testers and TZdEEI 7 × TZEEI 12 as a single-cross tester across environments. Hybrid TZdEEI 9 × TZEEI 79 was the highest-yielding and most stable. Other promising hybrids were TZdEEI 7 × TZEEI 79, TZdEEI 1 × TZdEEI 7 and TZdEEI 12 × TZEEI 95. These hybrids should be extensively tested on-farm for potential commercialization in SSA. Overall, our results highlighted the importance of harnessing beneficial alleles from wild relatives of maize for improvement of resistance to <i>Striga</i> and tolerance to drought in adapted maize germplasm. |
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| spelling | doaj.art-e1e230a88bcf48c6b23a3df9c4948bd02023-12-03T13:38:55ZengMDPI AGAgronomy2073-43952021-01-0111117710.3390/agronomy11010177Enhancing Drought Tolerance and <i>Striga hermonthica</i> Resistance in Maize Using Newly Derived Inbred Lines from the Wild Maize Relative, <i>Zea diploperennis</i>Abdulwahab S. Shaibu0Baffour Badu-Apraku1Monininuola A. Ayo-Vaughan2Department of Agronomy, Bayero University, Kano 700001, NigeriaInternational Institute of Tropical Agriculture (UK) Limited, Carolyn House, 26 Dingwall Road, Croydon CR9 3EE, UKDepartment of Plant Breeding and Seed Technology, Federal University of Agriculture Abeokuta, Abeokuta 110124, NigeriaRecurrent drought and <i>Striga hermonthica</i> (Del.) Benth parasitism constrains maize production in sub-Saharan Africa (SSA). Transfer of resistance genes from wild relatives can improve resistance to drought and <i>Striga</i> in tropical maize. The objectives of this study were to (i) determine the combining ability of 12 extra-early yellow maize inbreds derived from <i>Zea diploperennis</i> and tropical maize germplasm; (ii) classify the inbreds into heterotic groups using heterotic grouping based on the general combining ability (GCA) of multiple traits (HGCAMT) method; (iii) examine hybrid performance under contrasting environments; and (iv) examine the stability of hybrid combinations involving the inbreds. Sixty-six diallel crosses involving the inbreds plus four checks were evaluated for two years under drought, <i>Striga</i>-infested and rainfed environments in Nigeria. Significant differences (<i>p</i> < 0.05) were observed for the effects of genotype, environment, genotype × environment, GCA and specific combining ability (SCA) on grain yield and other measured traits. Inbred lines such as TZdEEI 7 × TZEEI 63 derived from <i>Z. diploperennis</i> and tropical germplasm exceeded the checks by a range of 28 to 41%. Across environments, the hybrid TZdEEI 1 × TZdEEI 7, which was derived from <i>Z. diploperennis</i>, was the highest-yielding with a grain yield of 4302 kg ha<sup>−1</sup>. The results revealed the predominance of GCA over SCA effects for most measured traits, suggesting that additive gene action governed the inheritance of <i>Striga</i> resistance and drought tolerance related traits in the inbreds. The 12 inbreds were classified into three heterotic groups, while TZEEI 79 and TZdEEI 7 were identified as inbred testers and TZdEEI 7 × TZEEI 12 as a single-cross tester across environments. Hybrid TZdEEI 9 × TZEEI 79 was the highest-yielding and most stable. Other promising hybrids were TZdEEI 7 × TZEEI 79, TZdEEI 1 × TZdEEI 7 and TZdEEI 12 × TZEEI 95. These hybrids should be extensively tested on-farm for potential commercialization in SSA. Overall, our results highlighted the importance of harnessing beneficial alleles from wild relatives of maize for improvement of resistance to <i>Striga</i> and tolerance to drought in adapted maize germplasm.https://www.mdpi.com/2073-4395/11/1/177drought<i>Striga hermonthica</i><i>Zea diploperennis</i>combining abilityheterotic group |
| spellingShingle | Abdulwahab S. Shaibu Baffour Badu-Apraku Monininuola A. Ayo-Vaughan Enhancing Drought Tolerance and <i>Striga hermonthica</i> Resistance in Maize Using Newly Derived Inbred Lines from the Wild Maize Relative, <i>Zea diploperennis</i> Agronomy drought <i>Striga hermonthica</i> <i>Zea diploperennis</i> combining ability heterotic group |
| title | Enhancing Drought Tolerance and <i>Striga hermonthica</i> Resistance in Maize Using Newly Derived Inbred Lines from the Wild Maize Relative, <i>Zea diploperennis</i> |
| title_full | Enhancing Drought Tolerance and <i>Striga hermonthica</i> Resistance in Maize Using Newly Derived Inbred Lines from the Wild Maize Relative, <i>Zea diploperennis</i> |
| title_fullStr | Enhancing Drought Tolerance and <i>Striga hermonthica</i> Resistance in Maize Using Newly Derived Inbred Lines from the Wild Maize Relative, <i>Zea diploperennis</i> |
| title_full_unstemmed | Enhancing Drought Tolerance and <i>Striga hermonthica</i> Resistance in Maize Using Newly Derived Inbred Lines from the Wild Maize Relative, <i>Zea diploperennis</i> |
| title_short | Enhancing Drought Tolerance and <i>Striga hermonthica</i> Resistance in Maize Using Newly Derived Inbred Lines from the Wild Maize Relative, <i>Zea diploperennis</i> |
| title_sort | enhancing drought tolerance and i striga hermonthica i resistance in maize using newly derived inbred lines from the wild maize relative i zea diploperennis i |
| topic | drought <i>Striga hermonthica</i> <i>Zea diploperennis</i> combining ability heterotic group |
| url | https://www.mdpi.com/2073-4395/11/1/177 |
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