Title:	Thermotolerance in lettuce seeds: association with ethylene and endo-B-mannanase.
Authors:	NASCIMENTO, W. M. CANTLIFFE, D. J. HUVER, D. J.
Affiliation:	WARLEY MARCOS NASCIMENTO, CNPH.
Date Issued:	2000
Citation:	Journal of American Society for Horticultural Science, v. 125, n. 4, p. 518-524, 2000.
Description:	Weakening 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.
Thesagro:	Alface Enzima Etileno Lactuca Sativa Semente Temperatura
NAL Thesaurus:	ethylene lettuce temperature
Keywords:	Tolerancia Termodormecia Tolerance Thermodormancy Enzyme
ISSN:	2327-9788
DOI:	https://doi.org/10.21273/JASHS.125.4.518
Type of Material:	Artigo de periódico
Access:	openAccess
Appears in Collections:	Artigo em periódico indexado (CNPH)