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Browsing School of Science and Computing (JA) by Issue Date

Now showing items 1-20 of 790

Desirable tea plants: an overview of a search for markers

Wachira, Francis N. (Tea Research Foundation of Kenya, 1990)

An overview is presented of current work on the search for biochemical and cytological markers linked to desired agronomic and quality characters for use as selection criteria in breeding work.
Genotype × environment interactions and genotypic stabilities in tea - a preliminary indication.

Wachira, Francis N.; Ng'etich, W. K.; Obaga, S. O.; Othieno, C. O. (Tea Research Foundation of Kenya, 1990)

Information on genotype environment interaction (GE) is derived from data on 2 yield components (shoot density and shoot dry weight) in 3 Camellia sinensis clones at 3 locations. GE was a significant source of variation ...
Biotechnology: an assessment of its applicability in the improvement of Kenyan tea clones - tissue and cell culture

Wachira, Francis N. (1990)

The subject is reviewed with reference to micropropagation, anther and callus culture techniques, somatic cell hybridization, and difficulties in tea culture systems.
Use of a non-destructive method of leaf area estimation in triploid and diploid tea plants (Camellia sinensis)

Wachira, Francis N.; Ng’etich, W. K. (1992)
Evaluation of fuel wood species for use in the tea industry

Wachira, Francis N.; Bore, J. K.; Njuguna, C. K. (Tea Research Foundation of Kenya, 1994)

Thirteen provenances (11 exotics and 2 Kenyan) of 6 Eucalyptus species (E. camaldulensis, E. dunnii, E. globulus, E. grandis, E. paniculata, E. saligna) were evaluated in a field trial at Timbilil estate, Kericho, Kenya ...
Breeding and clonal selection in relation to black tea quality: a review

Wachira, Francis N. (Tea Research Foundation, Kericho Kenya, 1994)

Reviews the rate of the genetic input (i.e breeding and selection) in quality realization in black tea. Discusses introduction/source of tea planting materials, hybridization, clonal selection and development of synthetic ...
Triploidy in tea (Camellia sinensis): Effect on yield and yield attributes

Wachira, Francis N. (Taylor & Francis:, 1994)

Effects of triploidy on yield and some yield components were evaluated in a heterogenous Kenyan population of diploid and naturally occurring triploid tea genotypes. Significant differences were recorded in all the components ...
Triploidy in tea (Camellia sinensis): Effect on yield and yield attributes

Wachira, Francis N. (1994-01)

Effects of triploidy on yield and some yield components were evaluated in a heterogenous Kenyan population of diploid and naturally occurring triploid tea genotypes. Significant differences were recorded in all the components ...
In vitro regeneration of Camellia sinensis (L.) O. Kuntze by somatic embryogenesis

Wachira, Francis N. (Springer Verlag, 1995-04)

Within 3 weeks of culture, excised cotyledon expiants of Camellia sinensis (L.) O. Kuntze produced somatic embryos without intermediate callus when cultured in Murashige and Skoog's basal medium with 30 g−1 sucrose. In ...
Detection of genetic diversity in tea (Camellia sinensis) using RAPD markers

Wachira, Francis N.; Waugh, R.; Powell, W.; Hackett, C. A. (NRC Research Press, 1995-04)

Camellia sinensis is a beverage tree crop native to Southeast Asia and introductions have been made into several nonindigenous countries. No systematic assessment of genetic variability in tea has been done anywhere. In ...
Genetic diversity in tea revealed by randomly amplified polymorphic DNA markers

Wachira, Francis N. (1996)
Nucleolar and nucleolus organiser regions activity in tea as visualised by silver staining

Wachira, Francis N.; Muoki, R. C. (1997)

Nucleoli and Nucleolus regions (NORs) in diploid, triploid and tetraploid tea (Camellia sinensis L.) were stained using a simplified technique of silver staining based on the colloidal two-stage method. Nucleoli were ...
In vitro shoot multiplication of Eucalyptus grandis

Wachira, Francis N. (1997)
An assessment of genetic diversity among Camellia sinensis L. (cultivated tea) and its wild relatives based on randomly amplified polymorphic DNA and organelle-specific STS.

Wachira, Francis N.; Powell, Wayne; Waugh, Robbie (Nature Publishing Group, 1997)

Members of the genus Camellia interbreed relatively freely and several natural species hybrids exist. Species introgression into the cultivated germplasm of tea, Camellia sinensis L. (O. Kuntz), from related Camellia species ...
Cambod tea: potential for commercial exploitation in Kenya

Wachira, Francis N.; Seurei, P.; Njugunga, C. K. (Tea Research Foundation of Kenya, 1997)

Six clones of Cambod or Shan tea, Camellia sinensis var. assamica spp. Lasiocalyx (planchon ex. watt), originally obtained from Reunium were evaluated and compared for yield performance and quality of Timbilil Estate of ...
Characterisation and estimation of genetic relatedness among heterogenous population of commercial tea clones by random amplification of genomic DNA samples

Wachira, Francis N. (Tea Research Foundation of Kenya, 1997)

The random amplified polymorphic DNA (RAPD) assay was used to characterize and estimate genetic relatedness in tea. 27 random nucleotide primers were screened individually within a test array composed of 36 commercial tea ...
Diversity and genetic differentiation among populations of Indian and Kenyan tea (Camellia sinensis (L.) O. Kuntze) revealed by AFLP markers

Wachira, Francis N.; Paul, S.; Powell, W.; Waugh, R. (Springer Verlag, 1997-02)

AFLP markers were successfully employed to detect diversity and genetic differentiation among Indian and Kenyan populations of tea (Camellia sinensis (L.) O. Kuntze). Shannon's index of diversity was used to partition the ...
Advances in tea genetics

Wachira, Francis N. (Tea Research Foundation of Kenya, 1997-12)
Contribution of Genome Analysis to Understanding of the Biology of, and Diseases Caused by, African Trypanosomes

Kadu, Caroline A. C.; Majiwa, P. A. O.; Djikeng, A.; Donelson, J. E. (National Research Center for Protozoan Diseases, 1998)

Molecular genetic studies on the African trypanosome have in the past fused on only a few genes or gene products consequently a significant number of genes of this organism remain unknown. We are sequencing random directional ...
Generation of expressed sequence tags as physical landmarks in the genome of Trypanosoma brucei

Kadu, Caroline A. C.; Djikeng, Appolinaire; Donelson, John E.; Majiwa, Phelix A. (Elsevier, 1998)

Previous molecular genetic studies on the African trypanosome have focused on only a few genes and gene products, the majority of which are concerned with surface antigenic variation; consequently, an insignificant number ...

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