Evaluotion of Nigella sativa ecotypes for drought stress tolerance

Sardari, Hassan (2018) Evaluotion of Nigella sativa ecotypes for drought stress tolerance. Masters thesis, University of Mohaghegh Ardabili.

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Abstract

Lack of soil moisture is one of the most important factors limiting plant growth. This experiment was conducted to evaluate the black cumin ecotypes in terms of tolerance to drought stress in the Ardabil Municipality Flower and Plant center in a split plot arrangement based on a completely randomized block design with three replications. The main plot factor of the experiment consisted of two levels of irrigation (full irrigation and irrigation until the flowering stage then no irrigation) and the subplot factor including 10 different black seed ecotypes (Khomeini Shahr, Semirom, Mashhad 1, Kazemin, Isfahan, Ardestan, Tabriz, Shabestar, Shahreza and Mashhad2). The results of analysis of variance showed that drought stress decreased significantly in all measured traits except for the flowering date and accelerated the black seed maturation time. Comparison of mean values showed that the highest grain yield (141.95 g/ m2) and oil content (35.5%) were obtained in Semiram and Kazmin ecotypes, respectively. Also, the highest 1000 kernel weight (2.75 g) was obtained in full irrigation treatment in Ardestan ecotype, which was categorized with Khomeini Shahr ecotype in full irrigationconditions. According to the results of the main components analysis and biplot diagram, Khomeini Shahr, Semirom and Ardestan ecotypes were selected as superior ecotypes compared to other ecotypes. Also, these genotypes had high values of MP, GMP, STI and HARM indices.

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