African Journal of
Plant Science

  • Abbreviation: Afr. J. Plant Sci.
  • Language: English
  • ISSN: 1996-0824
  • DOI: 10.5897/AJPS
  • Start Year: 2007
  • Published Articles: 687

Full Length Research Paper

Genetic variability studies of Valencia groundnut varieties for late leaf spot (Phaeoisariopsis personata) resistance

Wilber Wambi
  • Wilber Wambi
  • National Agricultural Research Organization, Bulindi Zonal Agricultural Research and Development Institute. P. O. Box 101 Hoima, Uganda.
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Pinehas Tukamuhabwa
  • Pinehas Tukamuhabwa
  • Department of Agricultural Production, School of Agricultural Sciences, Makerere University, P. O. Box 7062 Kampala, Uganda.
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Sivananda Varma Tirumalaraju
  • Sivananda Varma Tirumalaraju
  • South Dakota State University, P. O. Box 2207 A, Brookings, South Dakota, USA.
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David Kalule Okello
  • David Kalule Okello
  • National Semi-Arid Resources Research Institute Serere, P. O. Private Bag Soroti, Uganda.
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Carl Michael Deom
  • Carl Michael Deom
  • Department of Plant Pathology, University of Georgia, Athens, GA 30602, USA.
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Boris E. Bravo-Ureta
  • Boris E. Bravo-Ureta
  • Department of Agricultural and Resource Economics, University of Connecticut, Storrs, CT 06269, USA.
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Naveen Puppala
  • Naveen Puppala
  • New Mexico State University - Agricultural Science Center at Clovis, 2346 SR 288, Clovis, New Mexico. USA.
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  •  Received: 16 March 2015
  •  Accepted: 12 August 2015
  •  Published: 30 August 2015

Abstract

The study was initiated to determine the genetic variability of late leaf spot (LLS) resistance among segregating generations of Valencia groundnut varieties. Crosses were made between NuMex-M3 × ICGV-SM 02501, Valencia C × ICGV-SM 02501, Redbeauty × ICGV-SM 03590 and Valencia C × SGV-07009 parental lines and the resulting generations (F1, F2, BC1P1 and BC1P2,), along with parents for each cross, were evaluated for LLS resistance on a 1-9 scale under natural conditions in a randomized complete block design (RCBD) with three replications. Analysis of variance was performed for generations of each cross, coefficients of variation and heritability were estimated for all crosses except for the Valencia C × SGV-07009 cross. Three crosses showed highly significant differences among generations for LLS resistance (P≤ 0.05). The three crosses exhibited moderate to high levels of genotypic coefficient of variation (GCV) (15.43 to 23.13 %) and phenotypic  coefficient of variation (PCV) (16.89 to 28.82%). The exception was the Redbeauty × ICGV-SM 03590 cross which showed low (9.50%) GCV. Broad-sense heritability (h2b) estimates for LLS disease scores were moderate to high (32 to 64%) for the three crosses. The results reveal substantial variation for LLS resistance in generations of these crosses indicating that the trait under study was heritable. 
 
Key words: Valencia groundnut, Arachis hypogeae, late leaf spot, resistance, genetic variability.