New processing tomato hybrids and their stability in newly reclaimed soils in northern Egypt [electronic resource]

Includes references.

Twenty five processing tomato (LycopetSicon esculentum) genotypes including; 5 parents, 10 F₁'s and 10 F₂ generations were grown in eight environments; consisting of 2 locations (Abbies & Banger El-5okaer) and 4 seasons (summer and winter or two successive years) to estimate phenotypic stability of fruit weight, number of fruits, early and total yields.The model of Eberhart and Russel was applied in which the stability parameters b and S²d that were calculated for each genotype across the eight environments. In addition, the overall mean of each genotype and r² were considered. A stable genotype excelled for a particular trait when grown in either favorable or unfavorable environments. A stable genotye for a given trait was defined as one with an individual mean greater than the grand mean x > X. a regression coefficient (b) ≤1 (individual genotypic mean regressed against environmental means), a nonsignificant deviation mean squares from regression (S²d.), a coefficient of linear determination (r²) > 0.50. The F₁ hybrid P₂ x p₄ gave the highest mean total yield (3.14 kg/plant) and it was stable for all studied characters under different environmental conditions.

Summary in Arabic.

1