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Factors affecting stress tolerance in recalcitrant embryonic axes from seeds of four Quercus (Fagaceae) species native to the USA or China.
Xia, Ke; Hill, Lisa M; Li, De-Zhu; Walters, Christina.
Afiliación
  • Xia K; Germplasm Bank of Wild Species, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China USDA-ARS National Center for Genetic Resources Preservation, Fort Collins, CO 80524, USA.
  • Hill LM; USDA-ARS National Center for Genetic Resources Preservation, Fort Collins, CO 80524, USA.
  • Li DZ; Germplasm Bank of Wild Species, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China Key Laboratory of Biodiversity and Biogeography, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, 650201, China.
  • Walters C; USDA-ARS National Center for Genetic Resources Preservation, Fort Collins, CO 80524, USA christina.walters@ars.usda.gov.
Ann Bot ; 114(8): 1747-59, 2014 Dec.
Article en En | MEDLINE | ID: mdl-25326139
BACKGROUND AND AIMS: Quercus species are often considered 'foundation' components of several temperate and/or subtropical forest ecosystems. However, the populations of some species are declining and there is considerable urgency to develop ex situ conservation strategies. In this study, the storage physiology of seeds within Quercus was explored in order to determine factors that affect survival during cryopreservation and to provide a quantitative assessment of seed recalcitrance to support future studies of this complex trait. METHODS: Water relations and survival of excised axes in response to water loss and cryo-exposure were compared for four Quercus species from subtropical China (Q. franchetii, Q. schottkyana) and temperate USA (Q. gambelii, Q. rubra). KEY RESULTS: Seed tissues initially had high water contents and water potentials. Desiccation tolerance of the embryonic axis was not correlated with the post-shedding rainfall patterns where the samples originated. Instead, higher desiccation tolerance was observed in samples growing in areas with colder winters. Survival following cryo-exposure correlated with desiccation tolerance. Among species, plumule tissues were more sensitive than radicles to excision, desiccation and cryo-exposure, and this led to a higher proportion of abnormally developing embryos during recovery following stress. CONCLUSIONS: Quercus species adapted to arid and semi-humid climates still produce recalcitrant seeds. The ability to avoid freezing rather than drought may be a more important selection factor to increase desiccation tolerance. Cryopreservation of recalcitrant germplasm from temperate species is currently feasible, whilst additional protective treatments are needed for ex situ conservation of Quercus from tropical and subtropical areas.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Semillas / Estrés Fisiológico / Adaptación Fisiológica / Quercus Tipo de estudio: Diagnostic_studies País/Región como asunto: America do norte / Asia Idioma: En Revista: Ann Bot Año: 2014 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Reino Unido
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Semillas / Estrés Fisiológico / Adaptación Fisiológica / Quercus Tipo de estudio: Diagnostic_studies País/Región como asunto: America do norte / Asia Idioma: En Revista: Ann Bot Año: 2014 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Reino Unido