A-optimality of block designs for control versus test comparisons in diallel crosses is investigated. A sufficient condition for designs to be A-optimal is derived. Type S 0 designs are defined and A-optimal type S 0 designs are characterized. A lower bound to the A-efficiency of type S 0 designs is also given. Using the lower bound to A-efficiency, type S 0 designs are shown to yield efficient...

Fusarium wilt (Fusarium oxysporum f. sp. phaseoli) is one of the most common diseases in bean (Phaseolus vulgaris) crop, and viable alternative for its control use resistant cultivars. However, number “carioca” cultivars, important commercial group Brazil, which has a good level resistance to this disease, still low. To obtain populations with higher degree resistance, seven parents different l...

Abstract Pearl millet [ Pennisetum glaucum (L.) R. Br.] is an important food-security crop to smallholder farmers in West Africa (WA). Breeding for high yield and stability a major challenge the harsh environments of WA but could be tackled by more systematic exploitation hybrid vigor heterosis breeding both open-pollinated varieties (OPVs) different types hybrids. Knowledge combining ability p...

To examine the questions of whether the additive and dominance effects present for morphological characters in racial crosses are of sufficient consistency and magnitude to allow such genetic effects to be used for racial classification, we used a diallel experiment among the 25 well-defined Mexican races of maize, which include the ancestral stocks of most commercial and genetic maize types. W...

The fungus Pseudocercospora griseola, the causal agent of angular leaf spot in the common bean (Phaseolus vulgaris L.), exhibits a broad pathogenic variability that complicates the development of resistant cultivars. For breeding programs to successfully obtain common bean cultivars with durable resistance, knowing the aggressiveness of different strains, as well as the mechanisms of genetic re...

Elephant grass is a tropical forage plant widely distributed throughout Brazil. It was first exclusively used in the livestock sector as cattle feed. The grass is characterized by its high productivity and photosynthetic capacity and is considered as an alternative source of renewable energy. Here, we estimated the general combining ability of the parents and specific combining ability of the h...

in order to study the mode of genetic control and heritability of morphological characteristics important for the improvement of root weight, sugar yield and white sugar yield in tropical beet, griffing's diallel cross method along with the biplot display of diallel data were applied. nine sugar beet lines including 7112-36, 7173, 474, 452, 261, 436-104, sb-firoz, rr607 and 436 were crosse...