Review on Tomato (Solanum lycopersicum, L.) Improvement Programmes in Ghana

Tomato is an important component of every Ghanaian meal, and its cultivation contributes significantly to livelihood improvement. The demand for tomato in Ghana outstrips supply, and therefore local production is augmented by imports from neighbouring countries. Despite the importance of tomato in Ghana, past tomato-breeding programmes have been unsystematic and had not led to the development of new varieties that meet the needs of consumers as well as environmental stresses. This review outlined tomato production trends, constraints and past tomato improvement programmes in Ghana, which mainly focused on germplasm collection, morphological and agronomic characterization, molecular evaluation, diversity study, as well as screening germplasm against biotic and abiotic stresses. The established variability and the outcomes of the evaluations against the various biotic and abiotic stresses have not been utilized in the development of new varieties. This work will serve as a reference for developing future tomato-breeding programmes

Genetic diversity and inter-trait relationship of tropical extra-early maturing quality protein maize inbred lines under low soil nitrogen stress.

Information on the genetic diversity, population structure, and trait associations of germplasm resources is crucial for predicting hybrid performance. The objective of this study was to dissect the genetic diversity and population structure of extra-early yellow and orange quality protein maize (QPM) inbred lines and identify secondary traits for indirect selection for enhanced grain yield under low-soil nitrogen (LN). One hundred and ten inbred lines were assessed under LN (30 kg ha -1) and assayed for tryptophan content. The lines were genotyped using 2500 single nucleotide polymorphism (SNP) markers. Majority (85.4%) of the inbred lines exhibited wide pairwise genetic distances between 0.4801 and 0.600. Genetic distances were wider between yellow and orange endosperm lines and predicted high heterosis in crosses between parents of different endosperm colors. The unweighted pair group method with arithmetic mean (UPGMA) and the admixture model-based population structure method both grouped the lines into five clusters. The clustering was based on endosperm color, pedigree, and selection history but not on LN tolerance or tryptophan content. Genotype by trait biplot analysis revealed association of grain yield with plant height and ear height. TZEEQI 394 and TZEEIORQ 73A had high expressivity for these traits. Indirect selection for high grain yield among the inbred lines could be achieved using plant and ear heights as selection criteria. The wide genetic variability observed in this study suggested that the inbred lines could be important sources of beneficial alleles for LN breeding programs in SSA

Pre- and Post-Harvest Practices and Varietal Preferences of Tomato in Ghana

Tailored interventions in the tomato sector require current information on production and marketing systems along with the constraints faced by the stakeholders. We conducted this study to understand the current production practices, stakeholders’ varietal preferences, tomato market trends, and challenges along the crop’s value chains. A multistage sampling method coupled with a random walk was used to identify survey locations and identify 180 respondents across seven regions in Ghana. The study showed that tomato was predominantly produced by male (81%) and literate farmers (84%). Tomato farmers were smallholder farmers generally cultivating less than five acres. Tomato was mainly cultivated under rainfed conditions. Farmers used both bought seeds and their own saved seeds for production. Farmers in Bono, Greater Accra, and the Upper East region largely cultivated improved tomato varieties, while farmers in the Bono East region cultivated local varieties. Across the regions, being a male and having access to irrigation facilities increased the probability of using improved varieties by 19% and 51%, respectively. The most important farmer and market preference criteria included high yield, medium to large fruit size and rounded fruit shape, red color, time to maturity and disease resistance. The major production challenges of tomato production included diseases, pests, and poor access to water for irrigation. The average yield of tomato varied from 6902.26 kg/ha in the Bono Region to 16,213.98 kg/ha in Bono East. Tomato was exclusively produced for fresh market. The major marketing challenges were low producer prices, low demand for produce, and competition from other farmers. This study provides key information to improve tomato value chains and guide the introduction or breeding of improved tomato varieties

Pre- and Post-Harvest Practices and Varietal Preferences of Tomato in Ghana

Tailored interventions in the tomato sector require current information on production and marketing systems along with the constraints faced by the stakeholders. We conducted this study to understand the current production practices, stakeholders’ varietal preferences, tomato market trends, and challenges along the crop’s value chains. A multistage sampling method coupled with a random walk was used to identify survey locations and identify 180 respondents across seven regions in Ghana. The study showed that tomato was predominantly produced by male (81%) and literate farmers (84%). Tomato farmers were smallholder farmers generally cultivating less than five acres. Tomato was mainly cultivated under rainfed conditions. Farmers used both bought seeds and their own saved seeds for production. Farmers in Bono, Greater Accra, and the Upper East region largely cultivated improved tomato varieties, while farmers in the Bono East region cultivated local varieties. Across the regions, being a male and having access to irrigation facilities increased the probability of using improved varieties by 19% and 51%, respectively. The most important farmer and market preference criteria included high yield, medium to large fruit size and rounded fruit shape, red color, time to maturity and disease resistance. The major production challenges of tomato production included diseases, pests, and poor access to water for irrigation. The average yield of tomato varied from 6902.26 kg/ha in the Bono Region to 16,213.98 kg/ha in Bono East. Tomato was exclusively produced for fresh market. The major marketing challenges were low producer prices, low demand for produce, and competition from other farmers. This study provides key information to improve tomato value chains and guide the introduction or breeding of improved tomato varieties