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Title: Endo-β-mannanase and superoxide dismutase as enzymatic markers for lettuce seeds thermotolerance
Keywords: Isoenzymes
Higher temperatures
Lactuca sativa L.
Altas temperaturas
Issue Date: 2023
Publisher: Associação Brasileira de Tecnologia de Sementes
Citation: CAVASIN, P. Y. et al. Endo-β-mannanase and superoxide dismutase as enzymatic markers for lettuce seeds thermotolerance. Journal of Seed Science, [S.l.], v.45, 2023.
Abstract: At higher temperatures, lettuce seeds may not germinate, resulting in problems for crop establishment in the field and production. This study aimed to evaluate the maternal effect for thermotolerance on lettuce seeds and find enzymatic markers. We used the thermoinhibition tolerant cultivar ‘Everglades’, the sensitive ‘Verônica’, their reciprocal hybrids, F1 and F2 generation. Seeds were submitted to germination and enzymatic tests (catalase, superoxide dismutase, ascorbate peroxidase, and endo- β-mannanase). Germination (first and final counting) and speed index were compared through Tukey’s test. ‘Everglades’ and its reciprocal hybrids, have not been influenced by temperature regarding germination compared to the other treatments. Also, the maternal effect was observed for the F1 generation. Higher temperatures interfere with the activity of all enzymes evaluated, consequently in the physiological parameters. However, superoxide dismutase and endo- β-mannanase have shown direct and more expressive correlation with changes on the physiological parameters compared to the other enzymes. Thus, it is possible to conclude that those enzymes can be used as markers for thermotolerant genotype selection.
Appears in Collections:DAG - Artigos publicados em periódicos

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