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Article

Hybrid Breeding for MLN Resistance: Heterosis, Combining Ability, and Hybrid Prediction

1
Department of Agricultural Science and Technology, Kenyatta University, Nairobi 43844-00100, Kenya
2
International Maize and Wheat Improvement Centre (CIMMYT), World Agroforestry Centre (ICRAF), United Nations Avenue, Gigiri, Nairobi 1041-00621, Kenya
3
Biometrics and Statistics Unit, International Maize and Wheat Improvement Center (CIMMYT), CarreteraMexico-Veracruz Km. 45, El Batán, Texcoco Estado de Mexico 56237, Mexico
*
Author to whom correspondence should be addressed.
Plants 2020, 9(4), 468; https://doi.org/10.3390/plants9040468
Received: 20 February 2020 / Revised: 24 March 2020 / Accepted: 25 March 2020 / Published: 8 April 2020
(This article belongs to the Special Issue Plants Heterosis)
Prior knowledge on heterosis and quantitative genetic parameters on maize lethal necrosis (MLN) can help the breeders to develop numerous resistant or tolerant hybrids with optimum resources. Our objectives were to (1) estimate the quantitative genetic parameters for MLN disease severity, (2) investigate the efficiency of the prediction of hybrid performance based on parental per se and general combining ability (GCA) effects, and (3) examine the potential of hybrid prediction for MLN resistance or tolerance based on markers. Fifty elite maize inbred lines were selected based on their response to MLN under artificial inoculation. Crosses were made in a half diallel mating design to produce 307 F1 hybrids. All hybrids were evaluated in MLN quarantine facility in Naivasha, Kenya for two seasons under artificial inoculation. All 50 inbreds were genotyped with genotyping-by-sequencing (GBS) SNPs. The phenotypic variation was significant for all traits and the heritability was moderate to high. We observed that hybrids were superior to the mean performance of the parents for disease severity (−14.57%) and area under disease progress curve (AUDPC) (14.9%). Correlations were significant and moderate between line per se and GCA; and mean of parental value with hybrid performance for both disease severity and AUDPC value. Very low and negative correlation was observed between parental lines marker based genetic distance and heterosis. Nevertheless, the correlation of GCA effects was very high with hybrid performance which can suggests as a good predictor of MLN resistance. Genomic prediction of hybrid performance for MLN is high for both traits. We therefore conclude that there is potential for prediction of hybrid performance for MLN. Overall, the estimated quantitative genetic parameters suggest that through targeted approach, it is possible to develop outstanding lines and hybrids for MLN resistance. View Full-Text
Keywords: maize lethal necrosis; combining ability; heterosis; genomic prediction; resistance maize lethal necrosis; combining ability; heterosis; genomic prediction; resistance
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MDPI and ACS Style

Nyaga, C.; Gowda, M.; Beyene, Y.; Murithi, W.T.; Burgueno, J.; Toledo, F.; Makumbi, D.; Olsen, M.S.; Das, B.; L. M., S.; Bright, J.M.; Prasanna, B.M. Hybrid Breeding for MLN Resistance: Heterosis, Combining Ability, and Hybrid Prediction. Plants 2020, 9, 468. https://doi.org/10.3390/plants9040468

AMA Style

Nyaga C, Gowda M, Beyene Y, Murithi WT, Burgueno J, Toledo F, Makumbi D, Olsen MS, Das B, L. M. S, Bright JM, Prasanna BM. Hybrid Breeding for MLN Resistance: Heterosis, Combining Ability, and Hybrid Prediction. Plants. 2020; 9(4):468. https://doi.org/10.3390/plants9040468

Chicago/Turabian Style

Nyaga, Christine, Manje Gowda, Yoseph Beyene, Wilson T. Murithi, Juan Burgueno, Fernando Toledo, Dan Makumbi, Michael S. Olsen, Biswanath Das, Suresh L. M., Jumbo M. Bright, and Boddupalli M. Prasanna 2020. "Hybrid Breeding for MLN Resistance: Heterosis, Combining Ability, and Hybrid Prediction" Plants 9, no. 4: 468. https://doi.org/10.3390/plants9040468

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