Plant Pathology Journal1812-53871812-5425Asian Network for Scientific Information10.3923/ppj.2006.329.335Theobroma cacao L.) Progenies from SNK10 x SNK413; ICS84 x ICS95 to Phytophthora megakarya in Cameroon by Measuring Size of Necrotic Lesion along the Midrib]]>DjocgoueP.F.T. BoudjekoD.J. NankeuM.I.B. EfombagnS. NyasseD.N. Omokolo3200653The susceptibility of Theobroma cacao L. to Phytophthora
megakarya was assessed in four seedlings progenies (♀ ICS84 ♂
% ICS95, ♀ ISC95 ♂ % ICS84, ♀ SNK413 ♂ % SNK10, ♀
SNK10 x ♂SNK413) by measuring daily, the size of the necrotic lesion along
the midrib after inoculation. Using the statistical analysis of necrotic lesion
along the midrib it was possible to show that progenies resulting from three
clustured in 12 and 14 groups. The sizes of the lesion of parental clones are
significantly different. The values of heterosis allow confirm the transmission
of the vigor to the hybrid. For each progeny, more than 60% of individuals show
this phenomenon. The ANOVA analysis of necrotic lesion shows a significant effect
of day after inoculation and genotype to all the progenies at 0.001 probability
level. Narrow sense heritability was average for SNK clones (local Trinitario)
and high for ICS clones (introduced Trinatario), varying between 0.43 and 0.73.
This suggested that ICS clones appeared to be the best promising parents than
SNK. For every reciprocal crossing, no significant difference of narrow sense
heritability was observed, this suggested the absence of a maternal effect when
considering the size of necrosis.]]>Begun, J.M. and K.R. Gabriel,1981Cilas, C.,1991Evans, H.C., U. Krauss, R. Rios-Ruiz, T. Zecevich-Acosta and E. Arevalo-Gardini,1998Laurent, V., A.M. Risterucci and C. Lanaud,1994Laurent, V., J.A.K. N’goran, A.B. Eskes and C. Lanaud,1995Ndoumbe, M., D. Bieysse and C. Cilas,2001Ndoumbe-Nkeng, M., C. Cilas, E. Nyemb, S. Nyasse, D. Bieysse, A. Flori and I. Sache,2004Nyasse, S., C. Cilas, C. Herail and G. Blaha,1995Theobroma cacao L.) resistance to Phytophthora black pod disease.]]>Nyasse, S., D. Despreaux and C. Cilas,2002Phytophthora megakarya in cocoa (Theobroma cacao L.) diallel mating design.]]>Omokolo, N.D., D.J. Nankeu, N. Niemenak and T. Boudjeko,2003Theobroma cacao L. pods upon Phytophtora megakarya Braz et Griff. inoculation.]]>Tahi, M., I. Kebe, A.B. Eskes, S. Ouattara, A. Sangare and F. Mondeil,2000Phytophthora palmivora using leaves, twigs and roots.]]>Tan, G.Y. and W.K. Tan,1990Phytophthora palmivora in cocoa.]]>Wood, G.A.R. and R.A. Lass,1985Theobroma.]]>Simmonds, N.W. and J. Smartt,1999Zahour, A.,1992Cilas, C., M. Ndoumbe-Nkeng, N. Bidzanga and J. N'goran,2004Anonymous,1997