Selection for Resistance to Coffee Berry Disease, High Yields and Good Quality Within Coffea Arabica L. Cultivar, Ruiru 11

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2013
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Coffea arabica cv. Ruiru 11 is a composite of sixty six (66) F 1 hybrid sibs each derived from a cross between a specific female and male population. The pedigree of Ruiru 11 consist of CBO resistance donors, Rume Sudan (R gene), Hibrido De Timor (T or Ck-J gene), Catimor (T or Ck-J gene), K7 (k gene), SU and the high yielding, good quality but susceptible cultivars such as N39, SL28, SL34 and Bourbon. Although the composite cultivar, Ruiru 11 generally combines CBO resistance with high yields and fine quality, Ruiru 11 sibs present significant variability in terms of resistance to CBO, quality and yields. The varying parentage of Ruiru 11 sibs could be contributing to the observed variation in beverage quality and non-uniform resistance to CBD within the composite cultivar. Besides the genetic differences, the growing environment has a strong effect on yields and quality.
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