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Abstract

The demand for tomato (Solanum lycopersicum) is growing in Benin, due to growing urban markets. However, its production faces many constraints, including bacterial wilt (BW) caused by Ralstonia solanacerum species complex (RSSC). The use of resistant rootstock in tomato grafting has been identified as an efficient management strategy to control the BW. In this study, the bacterial wilt resistance and agronomic potential of two rootstocks were evaluated using susceptible scions in Benin. The experiment was conducted over two years in two locations Abomey-Calavi (site 1), and Sekou (site 2). The experiments were laid out in a randomized complete block design with three replicates. ‘Hawaii7996’ and ‘Padma F1’, were used as rootstocks. The scions included two inbred lines (CLN1621L, CLN2498D) and the susceptible cultivar ‘Tounvi’ self-grafted on ‘Tounvi’ and used as control. Data collected included prevalence of BW incidence, days to 50% flowering, and fruit yield components. There were significant differences among treatments (rootstocks + scions) for the prevalence of BW at both locations. The highest incidence of BW occurred on ‘Tounvi’/‘Tounvi’ (control) with 65.36 and 82.40% prevalence in Abomey-Calavi and Sekou, respectively. ‘Tounvi’ grafted on ‘Hawaii7996’ showed low BW incidence of 0 and 6.48% in Abomey-Calavi and Sekou, resp. Similarly, ‘Tounvi’ grafted on ‘Padma F1’ showed a low incidence of BW of 0 and 10.18% in Abomey-Calavi and Sekou, respectively. The inbred lines CLN1621L, CLN2498D used as scions showed 100% of resistance when grafted with the different rootstocks in the two locations. Grafting significantly improved the total marketable yield in the experiments across the years. The ‘Padma F1’/‘Padma F1’ treatment consistently produced the highest yields with 24.50 and 60.81 t ha-1 in the respective sites, while the ‘Tounvi’/‘Tounvi’ treatment consistently yielded the least with 6.95 and 3.31 t ha-1 across years. ‘Hawaï7996’ and ‘Padma F1’ used as rootstocks successfully managed BW, however, ‘Hawaï7996’ was considered the most efficient rootstock for tomato grafting in Benina

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