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DOI | 10.1002/ajb2.1300 |
Oxalis seeds from the Cape Flora have a spectrum of germination strategies | |
Jooste, Michelle1; Midgley, Guy F.1; Oberlander, Kenneth C.2; Dreyer, Leanne L.1 | |
发表日期 | 2019 |
ISSN | 0002-9122 |
EISSN | 1537-2197 |
卷号 | 106期号:6页码:879-893 |
英文摘要 | Premise Seed germination strategy has profound ecological and evolutionary consequences, with transitions between germination strategies receiving renewed recent attention. Oxalis from the Cape Flora, South Africa, has seeds with two contrasting germination strategies: orthodox and recalcitrant. The morphological gulf between these strategies (and potential intermediate morphologies) has been poorly quantified, with questions regarding their ecological function and evolution. We reconsidered this binary classification, emphasizing potential intermediate states. Methods Seed physiological traits were used to assign strategies to 64 Oxalis species. We tested for morphological/phenological signal corresponding to defined strategies with cluster, principal component, K-means clustering and discriminant analyses. Results We showed that an intermediate germination strategy does exist among Cape Oxalis, with two possible morphological groups within each strategy. These could reflect a continuum of germination states, where an ancestral orthodox strategy evolved toward a maximally recalcitrant peak, with a mosaic of intermediate states reflected in extant taxa. Conclusions Environmental factors may affect germination strategy and distribution throughout the Cape because recalcitrant and intermediate species are confined to the winter rainfall region. They occupy specialized niches and may face adverse impacts under predicted climate change (hotter and drier winters), meriting focused future conservation. |
WOS研究方向 | Plant Sciences |
来源期刊 | AMERICAN JOURNAL OF BOTANY
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文献类型 | 期刊论文 |
条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/98668 |
作者单位 | 1.Univ Stellenbosch, Dept Bot & Zool, Private Bag X1, ZA-7602 Matieland, South Africa; 2.Univ Pretoria, Dept Plant & Soil Sci, Plant Sci Complex,Private Bag X20, ZA-0028 Hatfield, South Africa |
推荐引用方式 GB/T 7714 | Jooste, Michelle,Midgley, Guy F.,Oberlander, Kenneth C.,et al. Oxalis seeds from the Cape Flora have a spectrum of germination strategies[J],2019,106(6):879-893. |
APA | Jooste, Michelle,Midgley, Guy F.,Oberlander, Kenneth C.,&Dreyer, Leanne L..(2019).Oxalis seeds from the Cape Flora have a spectrum of germination strategies.AMERICAN JOURNAL OF BOTANY,106(6),879-893. |
MLA | Jooste, Michelle,et al."Oxalis seeds from the Cape Flora have a spectrum of germination strategies".AMERICAN JOURNAL OF BOTANY 106.6(2019):879-893. |
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