Genotype × Environment Interaction of Mosaic Disease, Root Yields and Total Carotene Concentration of Yellow-Fleshed Cassava in Nigeria

• Published in: International Journal of Agronomy Vol. 2012; no. 2012; pp. 212 - 219
• Main Authors: Maroya, Norbert G., Kulakow, Peter, Dixon, Alfred G. O., Maziya-Dixon, Busie B.
• Format: Journal Article
• Language: English
• Published: Cairo, Egypt Hindawi Limiteds 01.01.2012; Hindawi Puplishing Corporation; Hindawi Publishing Corporation; Hindawi Limited; Wiley
• Subjects: Agronomy; Cassava; Cloning; Disease; Dry matter; Food; Genotypes; Manihot esculenta; Mosaics; Public health; Vitamin A; Nigeria; Sierra Leone
• ISSN: 1687-8159; 1687-8167
• DOI: 10.1155/2012/434675

Twenty-one yellow-fleshed cassava genotypes were evaluated over two years in five major cassava growing agroecological zones in Nigeria. The trials were established in a randomized complete block design with four replications to assess genotype performance and Genotype × Environment interaction for cassava mosaic disease (CMD), fresh and dry root yield (FYLD; DYLD), root dry matter content (DMC), and total carotene concentration (TCC). Combined analysis of variance showed significant differences (P<0.001) among genotypes (G), environment (E), and Genotype × Environment interaction (GE) for all the traits tested. For reaction to CMD, the best genotypes showing stable resistance were TMS 07/0539 and TMS 07/0628. For root yield, the best genotypes were TMS 01/1368 and TMS 07/0553. Genotype TMS 07/0593 was the best for DMC and TCC across the 10 environments. Variation among genotypes accounted for most of the Total Sum of Squares for CMD (72.1%) and TCC (34.4%). Environmental variation accounted for most of the Total Sum of Squares for FYLD (42.8%), DYLD (39.6%), and DMC (29.2%). This study revealed that TMS 07/0593 has the highest and most stable TCC, DMC with the lowest CMD severity score and appeared to be the best genotype.