GENETIC DIVERSITY IN COFFEA CANEPHORA BASED ON THEIR REACTIONS TO RACES OF HEMILEIA VASTATRIX (BERK AND BROOME)

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GENETIC DIVERSITY IN COFFEA CANEPHORA BASED ON THEIR REACTIONS TO RACES OF HEMILEIA VASTATRIX (BERK AND BROOME)

Journal Title: World Journal of Pharmaceutical and life sciences - Year 2019, Vol 5, Issue 1

Abstract

Coffee leaf rust (CLR) has been persistently causing serious yield reduction on Coffea arabica coffee in Tanzania. For several decades now there has been no information on the response of Coffea canephora to different races of Hemileia vastatrix in Tanzania. In recent years variations on the reactions of Coffea canephora to coffee leaf rust disease was observed in the robusta coffee germplasm at TaCRI Maruku. An experiment was conducted at Maruku coffee research institution to investigate various races of H. vastatrix infecting cultivated C. canephora and wild coffee genotypes. Assessment on the reactions to the pathogen of H. vastatrix was conducted by using 114 cultivated C. canephora and 23 wild coffee genotypes. Two main groups of C. canephora with complete and susceptible genotypes were identified. The investigations revealed that 41.2% of assessed genotypes demonstrated complete resistance to coffee leaf rust disease. The remaining 58.8% of evaluated were susceptible to the disease at varied levels of severity ranging from 100 to10%. Susceptible genotypes were subdivided into eleven subgroups corresponding to the response to specific races. Variations in the response of C. canephora genotypes to different physiological races of H. vastatrix revealed genetic diversity among the genotypes of cultivated and wild C.canephora in Tanzania.

Authors and Affiliations

Dr. Nyabisi Maliyatabu Ng’homa

Keywords

Genotypes of Robusta Coffee Leaf rust races.

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EP ID EP674777
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