caa a22 4500 477135021 CHVBK 20180405111715.0 cr unu---uuuuu 170330e19970801xx s 000 0 eng 10.1023/A:1003046604105 doi (NATIONALLICENCE)springer-10.1023/A:1003046604105 Inheritance of foliar resistance to Phytophthora palmivora (butler) Butler in cacao (theobroma cacao L.) [Elektronische Daten] [A.D. Iwaro, P. Umaharan, T.N. Sreenivasan] The genetic nature of resistance in leaves of cacao (Theobroma cacao L.) to Phytophthora palmivora (Butler) Butler was investigated in a 3 × 8 and a 4 × 4 mating design. Leaf resistance was assessed at the penetration and post-penetration stages of infection. Wide variability was observed among the 32 families examined for lesion frequency (penetration resistance) and lesion size / spread (post-penetration resistance). Segregation within families showed a continuous distribution for both forms of resistance, suggesting that resistance is polygenic. The poor association between resistance at the penetration stage and that at the post-penetration stage suggested that they were independently inherited and could be selected independently with the aim of accumulating genes for resistance. Genetic complementation between the two forms of resistance and transgressive segregation were evident within the families studied. The additive effects were predominant for lesion size, while both additive and non-additive effects were important in the inheritance of lesion frequency. The narrow sense heritabilities obtained from North Carolina Model II analysis were as high as 0.61 and 0.40 for lesion size and lesion frequency respectively. Possible breeding strategies based on these findings are discussed. Kluwer Academic Publishers, 1997 leaf blight nationallicence polygenic resistance nationallicence diallel nationallicence heritability nationallicence Iwaro A.D. Cocoa Research Unit, Trinidad and Tobago, West Indies aut Umaharan P. Department of Plant Science, the University of the West Indies, St. Augustine, Trinidad and Tobago, West Indies aut Sreenivasan T.N. Cocoa Research Unit, Trinidad and Tobago, West Indies aut Euphytica Kluwer Academic Publishers 96/3(1997-08-01), 377-383 0014-2336 96:3<377 1997 96 10681 https://doi.org/10.1023/A:1003046604105 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/A:1003046604105 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Iwaro A.D. Cocoa Research Unit, Trinidad and Tobago, West Indies aut NATIONALLICENCE 700 1- Umaharan P. Department of Plant Science, the University of the West Indies, St. Augustine, Trinidad and Tobago, West Indies aut NATIONALLICENCE 700 1- Sreenivasan T.N. Cocoa Research Unit, Trinidad and Tobago, West Indies aut NATIONALLICENCE 773 0- Euphytica Kluwer Academic Publishers 96/3(1997-08-01), 377-383 0014-2336 96:3<377 1997 96 10681 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer