DETERMINATION OF OPTIMAL CONDITIONS FOR CYTOGENETIC STUDIES IN QUINOA (Chenopodium sp.)
DETERMINATION OF OPTIMAL CONDITIONS FOR CYTOGENETIC STUDIES IN QUINOA (Chenopodium sp.)
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DOI: 10.22533/at.ed.813392322093
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Palavras-chave: 8-hidroxiquinolina; Colchicina; Cromatina; Cromosoma
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Keywords: 8-hydroxyquinoline; Colchicine; Chromatin; Chromosome
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Abstract:
Quinoa is a species of South American origin, of great importance for pre-Columbian peoples, it is currently recognized for its high nutritional value. The present study aimed to determine some tools of classical cytogenetics in Chenopodium species and establish the appropriate pretreatment for mitosis studies in two or three varieties of Chenopodium quinoa and Chenopodium album. The seeds from plants grown in the department of Nariño were subjected to three types of pretreatments (8-hydroxyquinoline -8AQ, 0.05% colchicine and 0.1% colchicine), a chemical digestion with HCl (1N) for 5, 10, 15 and 20 minutes at 60 ºC, and staining with 2% orcein. The results showed that the appropriate time for digestion with HCl was 15 minutes, for the treatments there were significant differences (p<0.0026), with an average chromatin observation of 32.3%; the pretreatment with higher percentages was presented for 8AQ with 57.5% on average, in contrast to the treatment with colchicine which was presented 27%; A similar response of the two Chenopodium species was found in phenological processes such as germination, and to the effect of the treatments, finding that 8-hydroxyquinoline (8AQ) is the most suitable pretreatment for visualization of chromatin and chromosomes. Ch. quinoa and Ch. album require a pretreatment for the observation of chromatin, both species respond in a similar way, with 8AQ being the best pretreatment for the two Chenopodium species, its use has been reported previously.
- Santina Rodrigues Santana
- Deisy Alexandra Rosero Alpala
- María Gladis Rosero