Application of stress susceptibility index for drought tolerance screening of tomato populations

Abstract

Investigation comprised 41 tomato genotypes originating from the population of domestic and domesticated genotypes collected in Serbia and belonging to the tomato collection of the Institute of Vegetable Crop Science, Smederevska Palanka. The aim of collection screening was to choose the genotypes tolerant to drought during plant intensive growth stage, whereby the process of selection would set out to obtain the recombinant genotypes for this abiotic factor. The screening criteria were established for genotype divergence in plant height and shoot-root ratio under conditions of optimal irrigation regime and drought. Divergence was estimated using cluster analysis with Euclidean distance as a measure of distance, with a complete gene attachment to grouping. Drought tolerance is expressed by the stress susceptibility index (SSI). Various results were obtained based on the screening of genotypes grown under optimal and dry conditions. As a measure of stress susceptibility, based on SSI, genotypes having different drought tolerance level were determined. On the grounds of the analyses carried out, 10 genotypes were segregated (G102, G104, G107, G109, G110, G119, G125, G126, G128 and G141) to represent a basis to obtain the recombinant genotypes and to initiate the selection for drought resistance. [Projekat Ministarstva nauke Republike Srbije, br. TR 31005 i br. TR 31059]

Enzymatic and non-enzymatic comparison of two different industrial tomato (Solanum lycopersicum) varieties against drought stress

“…The general effects of drought stress have been studied in different plant species. The main inhibitory features of drought stress were observed on cell proliferation and expansion, leaf size, stem elongation, root proliferation alongside with crop growth and biomass accumulation (Harrison et al 2014 ; Sekmen et al 2014 ; Shanker et al 2014 ; Zdravkovic et al 2013 ). On the other hand, plants involve specific protective adaptation mechanisms against short term and long term drought.…”

Germination of tomatoes under PEG-induced drought stress

“…The results are compared to the results of the experiments that included testing the same populations for drought tolerance at the stage of intensive vegetative growth. Sixteen drought stress selection indices and hierarchical cluster analysis were used in these studies to differentiate the populations (Zdravković et al 2013, Brdar-Jokanović et al 2014a. In accordance to the observations (Chaves et al 2003, Foolad 2005, Shamim et al 2014) that drought response of the particular tomato genotype often vary among the developmental stages, a majority of the populations designated as tolerant at germination stage belonged to the medium sensitive or sensitive (111,114,115,116) group when assessed in the stage of vegetative growth.…”

“…populations chosen from the collection of Serbian local populations, maintained at the Institute for Vegetable Crops in Smederevska Palanka. The populations (designated with numbers 101, 104-107, 109-116, 122 and 138) are potential starting material for breeding of new tomato cultivars and hybrids, and have previously been tested for drought tolerance at the stage of intensive vegetative growth (Zdravković et al 2013, Brdar-Jokanović et al 2014a, 2014b. The trial was conducted at the Institute of Field and Vegetable Crops, Novi Sad.…”

10.5937/ratpov51-5887 = Assessing tomato drought tolerance based on selection indices

“…Therefore, breeding tomato for drought tolerance would be an appropriate approach for solving this problem. Since modern cultivars and hybrids are mainly drought sensitive, a useful strategy may be to introduce in breeding programs the material collected and described as adaptive in the target areas, such as domestic, local populations (Foolad 2007, Glogovac & Takač 2010, Maksimović et al 2012, Zdravković et al 2013.…”