期刊
ECOLOGICAL RESEARCH
卷 26, 期 1, 页码 163-171出版社
SPRINGER TOKYO
DOI: 10.1007/s11284-010-0773-4
关键词
Cold stratification; Embryo growth; Ilex maximowicziana; Nondeep morphophysiological seed dormancy; Rudimentary embryo
类别
资金
- National Science Council, Taiwan [NSC 97-2313-B-054-003-MY3]
In this study, we show that seeds of Ilex maximowicziana collected from northern and southern Taiwan differ in germination responses to temperature. Seeds produced by plants growing in the tropical environment of southern Taiwan were more responsive (in a positive way) to higher incubation temperatures than those produced by plants growing in the subtropical environment of northern Taiwan. On the other hand, seeds produced in northern Taiwan were more responsive (in a positive way) to low incubation temperatures and to cold stratification than those from southern Taiwan. Germination percentages and rates of seeds from northern Taiwan were higher at 20/10A degrees C than at 30/20A degrees C, reaching a plateau of > 80% germination after 12 weeks incubation, whereas germination of seeds from southern Taiwan reached > 80% at 30/20 and 25A degrees C but not at 20/10A degrees C. Gibberellic acid (GA(3)) increased germination rate but not germination percentage of seeds from both southern and northern Taiwan. Freshly matured seeds of I. maximowicziana have rudimentary embryos. During dormancy break, embryo length increased 11.5- and 8.0-fold in northern and southern seeds, respectively, before radicle emergence. Thus, seeds of Ilex maximowicziana have nondeep simple morphophysiological dormancy. This is the first detailed study of the germination requirements of a subtropical/tropical species of the large cosmopolitan genus Ilex.
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