Improved procedures to assess plant protoplast viability: evidencing cytological and genomic damages

• Ano de defesa: 2017
• Autor(a) principal: Costa, Natalia Layane Badaró
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: eng
• Instituição de defesa: Universidade Federal de Viçosa
• Palavras-chave em Português: Protoplastos; Genoma; Biologia Geral
• Link de acesso: http://www.locus.ufv.br/handle/123456789/11949

Plant protoplasts are valuable in biotechnology, enabling the plantlet regeneration until the gene function determination. In all applications, viability test is required to measure the rate of viable protoplasts, allowing to decide on the most adequate isolation and purification procedures and to verify whether there are sufficient cells for subsequent steps. Fluorescence microscopy is usually employed for viability test. However, some problems have been pointed out: long time required to count a relatively small number of protoplasts, cell clumps preventing their observation, and the subjective visual perception of the fluorescence by observer. This study aimed to establish procedures for viability test adapted for flow cytometry (FCM), MuseTM cell analyzer (Muse) and Comet Assay (CA). For this, Capsicum annuum was chosen due to recalcitrant morphogenic nature of its protoplasts. After isolation and purification, the applications allowed assessing large numbers of protoplasts (FCM and MUSE) and protoplasts nuclei (CA) in a short time period. From the adjusted procedures, different types and levels of cytological (FCM and Muse) and genomic damages (Muse and CA) were evidenced, allowing to discriminate and measure the viable protoplasts. Considering the results, this study introduces improved quantitative procedures for viability test. Besides of these and aiming the plantlet regeneration, different methods can be applied to assess the protoplast viability, defining the more adequate isolation and purification procedures. Contributing with this purpose, guides were showed for FCM, Muse and CA to standardization of viability tests in plant protoplasts