Role of mitotic inhibitors and genotype on chromosome doubling of Rosa

• Published in: Euphytica 2008-03, Vol.160 (2), p.267-275
• Main Authors: Khosravi, Pegah, Kermani, Maryam Jafarkhani, Nematzadeh, Ghorban Ali, Bihamta, Mohammad Reza, Yokoya, Kazutomo
• Format: Article
• Language: English
• Subjects: Agronomy. Soil science and plant productions; amiprofos-methyl; Biological and medical sciences; Biomedical and Life Sciences; Biotechnology; chemical treatment; chromosome doubling; chromosome number; Chromosomes; cultivars; cytogenetics; Fundamental and applied biological sciences. Psychology; Generalities. Genetics. Plant material; Genetic resources, diversity; Genetics and breeding of economic plants; Genotype & phenotype; Herbicides; Life Sciences; oryzalin; Plant Genetics and Genomics; Plant growth; Plant material; Plant Pathology; Plant Physiology; Plant reproduction; Plant Sciences; polyploidy; Rosa; Trifluralin
• ISSN: 0014-2336; 1573-5060
• DOI: 10.1007/s10681-007-9571-7

Dinitroanilines represent a class of compounds that are widely used in herbicide formulations as they depolymerise plant microtubles, causing chromosome doubling. The potential of microtubule depolymerising herbicides trifluralin, oryzalin, and amiprophosmethyl (APM) for in vitro chromosome doubling of Rosa was studied. Five concentrations (0, 3, 6, 12 and 24 μM) and three exposure periods (12, 24 and 48 h) for each of the compounds were compared. Oryzalin, trifluralin and APM were not significantly different in their ability to induce chromosome doubling of R. hybrida cv Iceberg. At concentration of 6 μM and exposure period of 24 h, chromosome doubling of R. hybrida cv Iceberg was not significantly different with each of the polyplodising agents. At higher concentration (24 μM) and longer exposure period (48 h), 66.7% and 62.5% chromosome doubling was achieved with APM and trifluralin, respectively. However, the application of 6 μM oryzalin to R. persica (2n = 2x), R. hybrida cv Iceberg (2n = 3x) and R. hybrida cv Akito (2n = 4x), resulted in 60.0%, 6.3% and 0% chromosome doubling, respectively, which suggest that chromosome doubling is genotype dependent and plants with lower ploidy level have a higher propensity for chromosome doubling. Flow cytometry results at 18 and 24 weeks after herbicide treatment, indicated that the best time to test the treated plants was after 24 weeks.