Evaluation of Nigella sativa genotypes for salinity tolerance

Habibi Yengejeh, Aziz and Asghari Zakaria, Rasool and Kamrani, Morteza and Zare, Naser and Ghaffarzadeh Namazi, Leyla (2018) Evaluation of Nigella sativa genotypes for salinity tolerance. Masters thesis, University of Mohaghegh Ardabili.

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Abstract

The Nigella sativa L. is an Herbaceous herb, dicotyledonous and one-year-old herb belong to the Rununculaceae family. The vast applications of this plant in the food, pharmaceutical and cosmetic industries have been of particular importance. Evaluation of tolerance of black cumin genotypes to environmental stresses, especially salinity stress and its effect on different stages of growth on different traits and organs of black cumin, is an important factor in their selection for cultivation in different conditions. In this regard, an experiment was conducted to evaluate ten genotypes of black cumin for tolerance to salinity stress at three different levels (2.5, 5 and 7.5 dS/m) factorial experiment in a completely randomized block design with three replications in the Ardebil. The genotypes tested included Mashhad 1, Kazemin, Mashhad 2, Shabestar, Semirom, Tabriz, Ardestan, Isfahan, Khomeini Shahr and Shahreza. Treatment were made with sodium chloride solution at the concentrations mentioned, in the three to four leaf stages and in three stages. The results of analysis of variance showed that there is a significant difference between different levels of salinity stress and genotypes in terms of all measured traits at different levels of salinity stress at 1% probability level. Comparison the average of different levels of salinity stress for different traits showed that the highest reduction in measured traits was related to grain weight per plant (66.36%), root dry weight (56.32%) and grain weight per follicle (66.51%). Among genotypes, Kazemin genotype was the most tolerant genotypes in terms of grain weight per follicle, number of seeds per follicle, seed weight per plant and harvest index in salinity stress conditions and Shahreza genotype in terms of budding date, flowering date and maturity date, plant height, shoot and root dry weight, follicle number, seed weight per plant, 1000 seed weight and biological yield More tolerant than others was recognized for other genotypes. Analysis of salt tolerance indices showed that genotypes of Kazemin and Mashhad 2 were tolerant genotypes in all three levels of stress in terms of STI, GMP, MP and YI indices, and genotypes were susceptible are a Khomeini shahr and Shahreza genotypes. The results of cluster analysis in conditions without salt stress (control) showed that Shabestar, Tabriz, Mashhad, Mashhad 2 and Kazemin genotypes had better economic performance (seed weight per plant) than biological yield (shoot and root yield). The shahreza genotype at stress level of 2.5 and 5 dS / m was the most sensitive genotype to salinity stress, and Mashhad 2, Tabriz and Ardestan genotypes were evaluated at 7.5 dS / m with the highest seed yield as tolerant genotypes. Keywords: Black cumin, Tolerance index, Cluster analysis, Salinity stress

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