ISSN 2756-3847
International Journal of Plant Breeding and Genetics ISSN 2756-3847 Vol. 9 (7), pp. 001-011, July, 2022. © International Scholars Journals
Full Length Research Paper
Generation Mean Analysis for Yield and Yield Related Traits in Five Tomato Genotypes in Kenya
FK Kathimba¹*, PM Kimani¹, RD Narla¹, and LM Kiriika²
¹Department of Plant Science and Crop Protection, College of Agriculture and Veterinary Sciences, University of Nairobi, P.O Box 29053-00625, Nairobi, Kenya.
²Department of Horticulture and Food Security, Jomo Kenyatta University of Agriculture and Technology, P.O Box 6200-00620, Nairobi, Kenya.
Running Head: Inheritance of Yield and Yield Related Traits
Accepted 19 July, 2022
Abstract
The study aimed to determine inheritance of tomato yield and yield related traits in Kenya. Six generations were developed. Experiment was conducted in a split-plot design with crosses as main plots and generations as subplot at two sites. The six generations in all crosses performed better at Kabete compared to Mwea site. Significant yield increase of ≥18.11% per plant was registered in F₁ and F₂ generationsin comparison to parental genotypes. Cross Roma VF x AVTO1429 had the highest yield of 5.59 and 5.39kg plant-1in F₂ and F₁ generations, respectively. Highly significant additive, dominance, additive x additive, dominance x dominance and additive x dominance effects were noted in total soluble sugars and number of fruits per plant while significant dominant and additive x additive interaction effects were noted in fruit firmness and fruit width traits. BC₁P₂ of cross Roma VF x Valoria select had the highest TSS Brix of 4.00%. P2, F1 and F2 hybrids and BC₁P2 of cross Roma VF x Valoria select had the highest number of fruits. The importance of gene effects for inheritance was in additive and dominance-additive portions of genetic traits expressions which implied that the traits were inherited.
Key words: Generation mean, inheritance, tomato, yield traits, additive, dominance