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Título : Heat shock effect in breaking physical dormancy and identification of the water gap in seeds of Lupinus elegans and L. rotundiflorus from Jalisco, Mexico
Autor : Flores, J.
Robles-Díaz, E.
Jurado, E.
Ruiz-López, M.
Yáñez-Espinosa, L.
Consejo Nacional de Ciencia y Tecnologia-Fondos Sectoriales Secretaria de Medio Ambiente y Recursos Naturales 2006-1-23818 Consejo Nacional de Ciencia y Tecnologia 090388
Palabras clave : boiling water; dry sand; seed germination; wet sand
Fecha de publicación : mar-2014
Resumen : Most wild Lupinus spp. (Fabaceae) grow in pine and pine-oak forests with natural and induced fires. Their seeds have physical dormancy, which can be broken in response to appropriate environmental signals, such as high temperatures, humidity, and fire. We applied heat treatments to break seed dormancy of L. elegans and L. rotundiflorus from the State of Jalisco, Mexico, with different storage times (0, 1, and 2 yr for L. elegans and 0, 1, 2, 3, and 4 yr for L. rotundiflorus). One set of seeds were immersed in boiling water for 5, 10, and 15 s, another set were incubated in wet or dry sand at 100 degrees C, 120 degrees C, and 150 degrees C during 60 min and 90 min Germination trials were set at 25 degrees C with 12 h of irradiance per day. For both species, no germination resulted after incubation at 120 and 150 degrees C. For L. rotundiflorus, germination was higher for seeds incubated in wet sand for 60 min than for those incubated for 90 min. Fresh seeds of L. rotundiflorus showed higher germination than stored seeds across treatments. After scarification with boiling water, fresh seeds of L. elegans, germinated more than those stored for 1 and 2 year, whereas incubation in wet and dry sand resulted in higher germination for 1 and 2 year old seeds than for fresh seeds. Our results may be useful for further studies to understand and predict ecological plant responses in Mexican forests.
URI : http://ninive.uaslp.mx/jspui/handle/i/4202
ISBN : WOS:000333380200010
ISSN : 2007-4298
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