期刊
FOLIA GEOBOTANICA
卷 43, 期 4, 页码 383-396出版社
SPRINGER
DOI: 10.1007/s12224-008-9021-x
关键词
Australian arid zone plants; Germination; Seed mass*temperature interactions; Seed size and number
资金
- Australian Flora Foundation
- Mark Mitchell Research Foundation
- Wildlife Conservation Fund
- Native Vegetation Fund
- Flinders University Post-graduate Development Program
- Nature Foundation
The seed size and number theories have been proposed to explain the advantages of having many small versus a few large seeds in plants. In particular, seed germination is predicted to be shaped by temperature, and may differ for small and large seeds. In this study, we experimentally test germination at different temperatures in 12 species of arid zone plants in the genus Frankenia L. that differ in seed mass. Seed mass was categorized as smaller-seeded species versus larger-seeded species for analysis (six species per category). Many of these species co-occur geographically and hence experience similar abiotic conditions (unpredictable rainfall, extremes in temperature, poor soil conditions). The results demonstrated differences in germination as a result of the temperature*seed mass(species) interaction effect. There were significant differences in germination rates across seed mass categories during the first eight days of germination. Germination rates were higher in the larger-seeded species than the smaller-seeded species. Smaller-seeded species had lower germination success but had higher germination rates at lower temperatures, and had a more stringent temperature as a germination cue. These findings are discussed in the context of life-history strategies in arid zone plants.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据