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Evaluation and use of a screening method to aid selection of cocoa ( Theobroma cacao ) with field resistance to cocoa swollen‐shoot virus in Ghana
Author(s) -
LEGG J. T.,
LOCKWOOD G.
Publication year - 1977
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.1977.tb01837.x
Subject(s) - biology , theobroma , inoculation , amazon rainforest , hybrid , shoot , horticulture , resistance (ecology) , selection (genetic algorithm) , botany , agronomy , ecology , artificial intelligence , computer science
SUMMARY Seeds of cocoa progenies were inoculated with cocoa swollen‐shoot virus manually or by vector transfer techniques to assess the relative resistance of the progenies to infection. Assessment of progeny included in both inoculation tests and in field trials were positively correlated, indicating that the inoculation technique is suitable for the selection of progenies for testing in the field. Pure Upper Amazon progenies were more resistant than selfed Amelonado, with hybrids between Amelonado and Upper Amazons usually intermediate. Among the main Upper Amazon populations, Iquitos and Nanay clones were better sources of resistance than Parinari and Scavina clones. A survey of these populations indicated that, within populations, resistance levels do not vary greatly. A range of progenies based on the Upper Amazon female parents in existing seed gardens was screened for resistance and some were consistently more resistant than the equivalent Amazon x Amelonado hybrid now being distributed to farmers.