Plant Process and Function

en A comparative investigation of nickel hyperaccumulation and local adaptation in some of the Alyssum species A comparative investigation of nickel hyperaccumulation and local adaptation in some of the Alyssum species تنش فلزات سنگین Toxic ions stress پژوهشي Research <div style="text-align: left;">The relationship between the physiological nickel hyperaccumulation character, endemism in serpentine soils, tolerance indices, and karyotype differences of some accessions of nickel hyperaccumulator and non-accumulator of the genus Alyssum from serpentine and non-serpentine soils was investigated. Karyotypes were obtained from prometaphase and metaphase analysis maps by root meristem chromosomal staining. Physiological responses to nickel in the medium, including catalase activity as an indicator of iron accessibility, and photosynthetic pigments were measured. Karyotype of diploid species, 2n=2x=16, 20 and 22, was determined that the type of chromosomes are metacentric, submetacentric, acrocentric and telocentric. The results of chromosomes’ character analysis, such as<a name="_Hlk125902966"></a><a name="_Hlk124594011"> chromosome asymmetry coefficient</a>, showed a significant difference between these species in terms of various characters. The examination of the morphology of chromosomes revealed that species with more diverse chromosome types and superior chromosomal characteristics, such as secondary constriction, having the least metacentric chromosome, low centromeric index, and more asymmetric karyotype, were not nickel hyperaccumulators. Other data showed a decreased tolerance capacity of the non-serpentine plants via adaptation to normal soils. The data showed a correlation between nickel hyperaccumulation and primitive karyotype features in the Alyssum genus, and adaptations to normal soils could have diminished the intensity of the nickel hyperaccumulation trait.</div> The relationship between the physiological nickel hyperaccumulation character, endemism in serpentine soils, tolerance indices, and karyotype differences of some accessions of nickel hyperaccumulator and non-accumulator of the genus Alyssum from serpentine and non-serpentine soils was investigated. Karyotypes were obtained from prometaphase and metaphase analysis maps by root meristem chromosomal staining. Physiological responses to nickel in the medium, including catalase activity as an indicator of iron accessibility, and photosynthetic pigments were measured. Karyotype of diploid species, 2n=2x=16, 20 and 22, was determined that the type of chromosomes are metacentric, submetacentric, acrocentric and telocentric. The results of chromosomes’ character analysis, such as<a name="_Hlk125902966"></a><a name="_Hlk124594011"> chromosome asymmetry coefficient</a>, showed a significant difference between these species in terms of various characters. The examination of the morphology of chromosomes revealed that species with more diverse chromosome types and superior chromosomal characteristics, such as secondary constriction, having the least metacentric chromosome, low centromeric index, and more asymmetric karyotype, were not nickel hyperaccumulators. Other data showed a decreased tolerance capacity of the non-serpentine plants via adaptation to normal soils. The data showed a correlation between nickel hyperaccumulation and primitive karyotype features in the Alyssum genus, and adaptations to normal soils could have diminished the intensity of the nickel hyperaccumulation trait. Adaptation, Alyssum, Brassicaceae, Karyotype, Metal accumulation, Nickel, Serpentine Adaptation, Alyssum, Brassicaceae, Karyotype, Metal accumulation, Nickel, Serpentine 85 96 http://jispp.iut.ac.ir/browse.php?a_code=A-10-85-7&slc_lang=en&sid=1 Rasoul Ghasemi Rasoul Ghasemi rsl_ghsm@yahoo.com Yes Department of Biology, Faculty of Sciences, Payam Noor University, Tehran, Iran Department of Biology, Faculty of Sciences, Payam Noor University, Tehran, Iran Tayebeh Salehi Mobarekeh Tayebeh Salehi Mobarekeh tayebeh.salehi55@gmail.com No Department of Biology, Faculty of Sciences, Payam Noor University, Center of Isfahan, Iran Department of Biology, Faculty of Sciences, Payam Noor University, Center of Isfahan, Iran Maedeh Esmaeili Abhari Maedeh Esmaeili Abhari mdhesmaeili@yahoo.com No Department of Biology, Faculty of Sciences, Payam Noor University, Center of Isfahan, Iran Department of Biology, Faculty of Sciences, Payam Noor University, Center of Isfahan, Iran