Thermotolerance in lettuce seeds: association with ethylene and endo-B-mannanase.

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dc.contributorWARLEY MARCOS NASCIMENTO, CNPH.
dc.creatorNASCIMENTO, W. M.
dc.creatorCANTLIFFE, D. J.
dc.creatorHUVER, D. J.
dc.date2024-06-11T13:55:16Z
dc.date2024-06-11T13:55:16Z
dc.date2000-09-21
dc.date2000
dc.date.accessioned2026-07-07T04:08:52Z
dc.descriptionWeakening of the endosperm tissue around the radicle tip before radicle protrusion and a potential role of endo-β-mannanase during germination of lettuce seeds (Lactuca sativa L.) at high temperature (35 °C) were investigated. Seeds from the thermotolerant genotypes ‘Everglades’ and PI 251245 had greater endo-β-mannanase activity before radicle protrusion at 35 °C than the thermosensitive genotypes ‘Dark Green Boston’, ‘Valmaine’ and ‘Floricos 83’. Thermotolerant genotypes also generated more ethylene at high temperature. At 35 °C, germination of ‘Dark Green Boston’ and ‘Everglades’ seeds produced at days/nights of 20/10 °C was 10% and 32%, respectively, whereas germination of seeds produced at days/nights of 30/20 °C was 67% and 83%, respectively. Higher endo-β-mannanase activity was observed before radicle protrusion in ‘Dark Green Boston’ seeds produced at 30/20 °C compared with those produced at 20/10 °C. A relationship between seed germination at high temperature, ethylene production, and an increase in endo-β-mannanase activity before radicle protrusion was confirmed.
dc.identifierJournal of American Society for Horticultural Science, v. 125, n. 4, p. 518-524, 2000.
dc.identifier2327-9788
dc.identifierhttp://www.alice.cnptia.embrapa.br/alice/handle/doc/768128
dc.identifierhttps://doi.org/10.21273/JASHS.125.4.518
dc.identifier.urihttp://hdl.handle.net/123456789/452972
dc.languageeng
dc.rightsopenAccess
dc.subjectTolerancia
dc.subjectTermodormecia
dc.subjectTolerance
dc.subjectThermodormancy
dc.subjectEnzyme
dc.subjectAlface
dc.subjectEnzima
dc.subjectEtileno
dc.subjectLactuca Sativa
dc.subjectSemente
dc.subjectTemperatura
dc.subjectethylene
dc.subjectlettuce
dc.subjecttemperature
dc.titleThermotolerance in lettuce seeds: association with ethylene and endo-B-mannanase.
dc.typeArtigo de periódico

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