caa a22 4500 475750993 CHVBK 20180406123523.0 cr unu---uuuuu 170329e20000701xx s 000 0 eng 10.1023/A:1009802806674 doi (NATIONALLICENCE)springer-10.1023/A:1009802806674 Seed germination response to cold stratification period and thermal regime in Phacelia secunda (Hydrophyllaceae) - Altitudinal variation in the mediterranean Andes of central Chile [Elektronische Daten] [Lohengrin Cavieres, Mary Arroyo] The ability to germinate under a variety of environmental conditions is essential for plant species inhabiting a wide range of altitudes and latitudes. Phacelia secunda J.F. Gmel. (Hydrophyllaceae) is a perennial herb with wide latitudinal and altitudinal distributional ranges. In the central Chilean Andes (33°S) P. secunda can be found from 1600m sealevel up to the vegetation limit at 3400m. It has been suggested that seeds from populations encountering long periods with snow cover and adverse winter conditions would require longer periods of cold stratification for germination than those from populations exposed to milder winters. Given that the snow-free period decreases with elevation, seeds from high elevation populations could require longer period of cold stratification to germinate. Moreover, it has been shown that seeds from arctic and higher elevations environments are adapted to germinate better under high temperature conditions. Germination response with increasing periods of cold stratification (0-6 mo.) and under two contrasting thermoperiods (20°/1O°C; 10°/5°C; 12h day/night), were studied for 4 populations of P. secunda located at 1600, 2100, 2900 and 3400m a.s.l. Initiation of germination required increasingly longer periods of stratification with elevation, and proportionately fewer seeds germinated for any one stratification treatment at the higher elevations. Seeds from higher elevations germinated to a higher percentage under the high than the low temperature thermoperiods. These results illustrates a significant variation in germination characteristics over a spatially short environmental gradient. Kluwer Academic Publishers, 2000 seed germination nationallicence Phacelia secunda nationallicence cold stratification nationallicence thermal response nationallicence Alpine nationallicence altitudinal gradient nationallicence Cavieres Lohengrin Departmento de Botánica, Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción, Casilla 160-C, Concepción, Chile aut Arroyo Mary Departamento de Biología, Facultad de Ciencias, Universidad de Chile, Casilla 653, Santiago, Chile aut Plant Ecology Kluwer Academic Publishers 149/1(2000-07-01), 1-8 1385-0237 149:1<1 2000 149 11258 https://doi.org/10.1023/A:1009802806674 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/A:1009802806674 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Cavieres Lohengrin Departmento de Botánica, Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción, Casilla 160-C, Concepción, Chile aut NATIONALLICENCE 700 1- Arroyo Mary Departamento de Biología, Facultad de Ciencias, Universidad de Chile, Casilla 653, Santiago, Chile aut NATIONALLICENCE 773 0- Plant Ecology Kluwer Academic Publishers 149/1(2000-07-01), 1-8 1385-0237 149:1<1 2000 149 11258 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer