Early screening of resistance to Phytophthora spp. by means of leaf disc inoculation

摘要: Resistance to cocoa black pod disease is quantitative in nature. Field resistance evaluation takes many years of observation uniform, well-designed trials order be reliable. Broad sense heritability the percentage rotten pods on individual plants can 0.6 for nine observations but much lower (0.1 0.3) experiments with only three five (Kebe et al., 1999). leaf disc inoculation method, by applying one series, as high (Nyasse al. Furthermore, it has been shown so far that, at progeny level, this test give significant correlations field attack and Tahi, press). Evaluation plant given less conclusive results. The repeatability effective application will certainly depend adequate standardization environmental physiological factors that influence tissue resistance. These factors, they are known, indicated description test. This method expected speed up breeding selection activities such large scale germplasm collections, trials, early or progenies growing nursery field, studies host x pathogen interaction. working procedure adapted from applied Nyasse (1995). (Resume d'auteur)