African Journal of Plant Science
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Article Number - 1D5843C66663


Vol.11(12), pp. 415-429 , December 2017
DOI: 10.5897/AJPS2017.1581
ISSN: 1996-0824



Full Length Research Paper

Evaluation of Tanzanian maize germplasms for identification of resistant genotypes against maize lethal necrosis



Inocent Ritte
  • Inocent Ritte
  • Plant Biotechnology and Genomics Research Laboratory, College of Agriculture, Environment and Nutrition Sciences, Tuskegee University, Tuskegee, AL 36088, USA.
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Marceline Egnin
  • Marceline Egnin
  • Plant Biotechnology and Genomics Research Laboratory, College of Agriculture, Environment and Nutrition Sciences, Tuskegee University, Tuskegee, AL 36088, USA.
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Paul Kusolwa
  • Paul Kusolwa
  • Department of Crop Science and Production, Sokoine University of Agriculture, Morogoro, Tanzania.
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Papias Binagwa
  • Papias Binagwa
  • Plant Biotechnology and Genomics Research Laboratory, College of Agriculture, Environment and Nutrition Sciences, Tuskegee University, Tuskegee, AL 36088, USA.
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Kheri Kitenge
  • Kheri Kitenge
  • Selian Agricultural Research Institute, Arusha, Tanzania.
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Desmond Mortley
  • Desmond Mortley
  • Plant Biotechnology and Genomics Research Laboratory, College of Agriculture, Environment and Nutrition Sciences, Tuskegee University, Tuskegee, AL 36088, USA.
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Steven Samuels
  • Steven Samuels
  • Plant Biotechnology and Genomics Research Laboratory, College of Agriculture, Environment and Nutrition Sciences, Tuskegee University, Tuskegee, AL 36088, USA.
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Gregory Bernard
  • Gregory Bernard
  • Plant Biotechnology and Genomics Research Laboratory, College of Agriculture, Environment and Nutrition Sciences, Tuskegee University, Tuskegee, AL 36088, USA.
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Osagie Idehen
  • Osagie Idehen
  • Plant Biotechnology and Genomics Research Laboratory, College of Agriculture, Environment and Nutrition Sciences, Tuskegee University, Tuskegee, AL 36088, USA.
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Conrad Bonsi
  • Conrad Bonsi
  • Plant Biotechnology and Genomics Research Laboratory, College of Agriculture, Environment and Nutrition Sciences, Tuskegee University, Tuskegee, AL 36088, USA.
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 Received: 26 June 2017  Accepted: 11 September 2017  Published: 31 December 2017

Copyright © 2017 Author(s) retain the copyright of this article.
This article is published under the terms of the Creative Commons Attribution License 4.0


Experiments were conducted in season 2014B at Naivasha maize lethal necrosis screening facility to evaluate Tanzanian maize germplasms for resistance to maize lethal necrosis (MLN). One hundred and fifty-two maize landraces and 33 inbreed lines were artificially inoculated with maize chlorotic mottle virus and sugarcane mosaic virus isolates in two trials arranged in a completely randomized design (CRD) and two replications. Inocula for both virus isolates were prepared, combined and applied to the trials by a 12 L backpack mist blower 4 and 5 weeks after planting. Disease incidence was assessed based on a 1 to 5 MLN rating scale 14, 28, 42 and 72 days post inoculation (dpi) for landraces and 7, 14, 21 and 52 dpi for inbred lines. Significant phenotypic variations (P<0.05) were observed on landraces for symptoms and disease severity scores. Landrace TZA-2793 had the lowest mean score of 3.5 followed by the other four landraces: TZA-3585, TZA-3543, TZA-4505 and TZA-2292, which attained a mean score of 3.75. No significant variations (P>0.05) were detected on inbreed lines as all materials were susceptible to MLN with scores ranging from 4.5 to 5 except for resistant check CML494 (mean score of 3.75). In this study, five maize landraces were identified as tolerant candidates against MLN. The identified landraces should be subjected to further MLN testing to explore their potential in breeding for MLN resistance.

 

Key words: Zea mays, maize chlorotic mottle virus, sugarcane mosaic virus, maize lethal necrosis, maize landraces.

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APA Ritte, I., Egnin, M., Kusolwa, P., Binagwa, P., Kitenge, K., Mortley, D., Samuels, S., Bernard, G., Idehen, O., & Bonsi, C. (2017). Evaluation of Tanzanian maize germplasms for identification of resistant genotypes against maize lethal necrosis. African Journal of Plant Science, 11(12), 415-429.
Chicago Inocent Ritte, Marceline Egnin, Paul Kusolwa, Papias Binagwa, Kheri Kitenge, Desmond Mortley, Steven Samuels, Gregory Bernard, Osagie Idehen and Conrad Bonsi. "Evaluation of Tanzanian maize germplasms for identification of resistant genotypes against maize lethal necrosis." African Journal of Plant Science 11, no. 12 (2017): 415-429.
MLA Inocent Ritte, et al. "Evaluation of Tanzanian maize germplasms for identification of resistant genotypes against maize lethal necrosis." African Journal of Plant Science 11.12 (2017): 415-429.
   
DOI 10.5897/AJPS2017.1581
URL http://www.academicjournals.org/journal/AJPS/article-abstract/1D5843C66663

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