期刊
PLANT SPECIES BIOLOGY
卷 28, 期 3, 页码 215-223出版社
WILEY-BLACKWELL
DOI: 10.1111/j.1442-1984.2012.00380.x
关键词
ecological adaptation; embryo growth; epicotyl morphophysiological dormancy; radicle and cotyledon emergence; seed germination
资金
- University of Pavia
- Centro Flora Autoctona (Lombardy Region, north Italy) through the Lombardy Seed Bank
In this study we examined the germination ecology with special reference to the temperature requirements for embryo development and germination of Corydalis cava subsp. cava, under both outdoor and laboratory conditions. Corydalis cava is a spring flowering woodland tuberous geophyte widely distributed across Europe. Germination phenology, including embryo development and radicle and cotyledon emergence, was investigated in a population growing in northern Italy. Immediately after harvest, seeds of C.cava were sown both in the laboratory under simulated seasonal temperatures and naturally. Embryos, undifferentiated at the time of seed dispersal, grew during summer and autumn conditions, culminating in radicle emergence in winter, when temperatures fell to ca5 degrees C. Cotyledon emergence also occurred at ca5 degrees C, but first emergence was delayed until late winter and early spring. Laboratory experiments showed that high (summer) followed by medium (autumn) and low temperatures (winter) are needed for physiological dormancy loss, embryo development and germination respectively. Unlike seeds of C.cava that germinated in winter, in other Corydalis species radicle emergence occurred in autumn (C.flavula) or did not depend on a period of high summer temperature to break dormancy (C.solida). Our results suggest that subtle differences in dormancy and germination behavior between Corydalis species could be related to differences in their geographical distribution.
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