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The drought tolerance of tomato (Lycopersicon esculentum Mill.) is a trait   needing urgent improvement due to recent climate changes and limited water   availability. We therefore conducted a greenhouse screening experiment to   identify tomato cultivars with improved drought tolerance. Several   sensitivity and tolerance indices were computed based on morphological   markers. With the aim of establishing a correlation to these markers, a total   of 16 inter-simple sequence repeat (ISSR) primers were used, the genetic   diversity among cultivars was elucidated and clustering the cultivars into   groups based on their molecular profiles was performed. The obtained results   indicated that selection indices, such as geometric mean productivity (GMP),   mean productivity (MP), tolerance index (TOL),and stress tolerance index   (STI), represented suitable indices for screening the drought tolerance of   tomato cultivars. An interesting correlation of the ISSR analyses to these   morphological findings was established according to 83 detectable fragments   derived from 10 primers. The highest value of the effective multiplex ratio   (EMR) and marker index (MI) was detected for primer INC7 followed by INC1.   Based on Jaccard's similarity coefficients, the genetic distance of the   genotypes varied from 0.702 to 0.942 with a mean value of 0.882. The results   showed a clear-cut separation of the 15 tomato cultivars due to their genetic   variability, making them a valuable genetic source for their incorporation   into potential breeding programs. Molecular data were in good agreement with   the results as regards selection indices, and both of them will be useful   tools for improvement of the tomato germplasm

archives of biological sciences

Genetic diversity analysis based on molecular marker and quantitative traits of the response of different tomato (Lycopersicon esculentum Mill.) cultivars to drought stress