Genetic diversity among farmer-preferred cassava landraces in Uganda

  • LF Turyagyenda
  • EB Kizito
  • ME Ferguson
  • Y Baguma
  • JW Harvey
  • P Gibson
  • BW Wanjala
  • DSO Osiru

Abstract

Understanding of genetic diversity among a breeding population is an important requirement for crop improvement as it allows for the selection of diverse parental combinations and formation of heterotic pools for genetic gain. This study was carried out to determine genetic diversity within and among 51 farmer-preferred cassava (Manihot esculenta) landraces and 15 elite accessions grown in Uganda. Twenty six simple sequence repeat (SSR) markers used for genetic diversity assessment in this study revealed a total of 154 alleles, of which 24% were unique alleles present only in landraces. The genetic diversity and observed herozygosity in landraces were slightly higher than in elite accessions. Elite accessions clustered with some of the landraces indicating that there were some alleles in common. However, 58.8% of the landraces fell into 3 different clusters independent of the elite accessions. Including these landraces with unique alleles in cassava breeding schemes will increase the chances of producing farmer preferred adapted elite cultivars. The study also revealed genetic differentiation among accessions from different regions providing an opportunity for establishment of heterotic pools within a breeding programme.

Keywords: Alleles, Manihot esculenta, SSR markers

African Crop Science Journal, Vol. 20, Issue Supplement s1, pp. 15 - 30

Author Biographies

LF Turyagyenda
College of Agricultural and Environmental Sciences, Makerere University, P. O. Box 7062, Kampala, Uganda; National Agriculture research Organisation (NARO)-Uganda, P. O. Box 295, Entebbe, Uganda
EB Kizito
National Agriculture research Organisation (NARO)-Uganda, P. O. Box 295, Entebbe, Uganda; Department of Agricultural Sciences, Uganda Christian University, P. O. Box 4, Mukono, Uganda
ME Ferguson
International Institute of Tropical Agriculture (IITA) - International Livestock Research Institute (ILRI) Hub, P. O. Box 30709, Nairobi, 00100, Kenya
Y Baguma
National Agriculture research Organisation (NARO)-Uganda, P. O. Box 295, Entebbe, Uganda
JW Harvey
Biosciences eastern and central Africa (BecA) - International Livestock Research Institute (ILRI) Hub, P. O. Box 30709, Nairobi, 00100, Kenya
P Gibson
College of Agricultural and Environmental Sciences, Makerere University, P. O. Box 7062, Kampala, Uganda; Department of Plant, Soil and Agricultural Systems, Illinois University, Carbondale, IL, USA
BW Wanjala
Biosciences eastern and central Africa (BecA) - International Livestock Research Institute (ILRI) Hub, P. O. Box 30709, Nairobi, 00100, Kenya
DSO Osiru
College of Agricultural and Environmental Sciences, Makerere University, P. O. Box 7062, Kampala, Uganda
Section
Articles

Journal Identifiers


eISSN: 2072-6589
print ISSN: 1021-9730