Shahed University
Evaluation Of Stress Tolerance Indices In A Number Of Advanced Genotypes Of Lentil (Lens Culinaris Medik) Under Rainfed And Low Irrigation Conditions
Azim Ahmadi | Majid Amini Dehaghi | Mohammad Hossein Fotokian | Mohammad Sedghi | Cyrus Mansouri Far
URL :
http://research.shahed.ac.ir/WSR/WebPages/Report/PaperView.aspx?PaperID=116830
Date :
2019/09/11
Publish in :
Plant Archives
Link :
http://www.plantarchives.org/SPL20ISSUE20SUPP202,2019/8720(490-499).pdf
Keywords :
Lentil genotypes, stress tolerance index, irrigation conditions, yield and yield components
Abstract :
In order to evaluate the stress tolerance indices in some lentil genotypes, a split plot experiment was carried out in the form of a randomized complete block design with three replications and under rainfed and low irrigation conditions as the main factor and 12 genotypes as secondary factor in two regions, including Ardabil Agricultural Research Station and the central part of Germi city in the crop year 2015- 2016. The examined traits included the number of days to 50 flowering, plant height, maturity time, number of pods per plant, number of empty pods per plant, primary and secondary branches, 100-seed weight, seed yield, harvest index, RWC index, seed protein content, proline accumulation content and soluble sugars content. Based on the seed yield under non-stress (YP) and stress (YS) condition, the quantitative stress tolerance indices such as: mean productivity (MP), tolerance index (TOL), geometric mean productivity (GMP), harmonic mean (HARM), stress susceptibility index (SSI) and stress tolerance index (STI) were calculated. Analysis of variance revealed a significant difference between lentil genotypes in indices of GMP, MP, STI and HARM and stress and nonstress yields, indicating genetic diversity and selection of stress tolerance cultivars. Interaction effects of environmental conditions and genotype were statistically significant in TOL and SSI indices and in non-stress yield. Investigating the stress tolerance indices with regard to mean squares and simple correlation coefficients between these indices and seed yield showed that GMP, MP, STI and HARM indices were the most appropriate indices for stress tolerance evaluation in lentil genotypes in both rainfed and low irrigation conditions and selected to identify genotypes with high yield potential in both rainfed and low irrigation conditions. Based on the results obtained from comparisons of mean indices of stress tolerance, genotype ILL-2126 was identified as a stress tolerant genotype under rainfed conditions (with seed yield of 1388.02 kg/ha) and low irrigation conditions (with seed yield of 2159.77 kg/ha). Moreover, the ILL-2580 genotype showed the lowest water yield in both locations. Cluster analysis classified the genotypes into four groups and showed that the highest genetic gap belonged to ILL-2580 and ILL-2126 genotypes. Correlation of seed yield under stress condition (YS) with traits of seed protein content and proline accumulation content was positive and significant, and this correlation with total sugar was positive, and under stress conditions, it showed high correlation compared to YP. Plant height had the highest direct effect (0.84). The number of empty pods per plant showed the highest indirect effect through plant height (0.44) on
Authors' Home page
Majid Amini Dehaghi
Mohammad Hossein Fotokian