Arid
DOI10.1046/j.1365-2745.2003.00760.x
Ecological aspects of seed desiccation sensitivity
Tweddle, JC; Dickie, JB; Baskin, CC; Baskin, JM
通讯作者Tweddle, JC
来源期刊JOURNAL OF ECOLOGY
ISSN0022-0477
出版年2003
卷号91期号:2页码:294-304
英文摘要

1 The ability of seeds to survive desiccation is an important functional trait and is an integral part of plant regeneration ecology. Despite this, the topic has received relatively little attention from ecologists. In this study, we examine the relationships between seed desiccation tolerance and two important aspects of plant regeneration ecology: habitat and dormancy. This is done by comparative analysis of a data set of 886 tree and shrub species from 93 families.


2 The proportion of species displaying desiccation sensitive seeds declines as the habitat becomes drier, and possibly also cooler, although the latter observation requires cautious interpretation. Desiccation sensitivity is most common in moist, relatively aseasonal vegetation zones, but is infrequent in, though not absent from arid and highly seasonal habitats.


3 The highest frequency of desiccation sensitivity occurs in non-pioneer evergreen rain forest trees, although 48% of the species examined have desiccation tolerant seeds. In contrast, all pioneer taxa within the data set have drying tolerant seeds.


4 Desiccation sensitivity is more frequent in seeds that are non-dormant on shedding (c. 31%), than dormant (c. 9%). Highest frequencies of drying tolerance occur in seeds with physical or combinational dormancy, at 99% and 100%, respectively.


5 Although there is an association between non-dormancy and desiccation sensitivity in both tropical and temperate zones, the relationship does not appear to be causal.


6 Working from the hypothesis that seed desiccation sensitivity represents a derived state in extant species, we use the results to investigate and discuss possible ecological trade-offs and associated fitness advantages. These may explain the hypothesized repeated loss of this trait. The frequent association between large seed size and desiccation sensitivity is also considered.


英文关键词dormancy habitat regeneration ecology seed seed desiccation sensitivity seed desiccation tolerance
类型Article
语种英语
国家England ; USA
收录类别SCI-E
WOS记录号WOS:000181967800012
WOS关键词RECALCITRANT SEEDS ; RAIN-FOREST ; GERMINATION ; PLANTS ; EVOLUTION ; REGENERATION ; DISPERSAL ; TOLERANCE ; LONGEVITY ; STORAGE
WOS类目Plant Sciences ; Ecology
WOS研究方向Plant Sciences ; Environmental Sciences & Ecology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/145089
作者单位(1)Royal Bot Gardens Kew, Ardingly RH17 6TN, W Sussex, England;(2)Univ Kentucky, Dept Biol, Lexington, KY 40506 USA;(3)Univ Kentucky, Dept Agron, Lexington, KY 40546 USA
推荐引用方式
GB/T 7714
Tweddle, JC,Dickie, JB,Baskin, CC,et al. Ecological aspects of seed desiccation sensitivity[J],2003,91(2):294-304.
APA Tweddle, JC,Dickie, JB,Baskin, CC,&Baskin, JM.(2003).Ecological aspects of seed desiccation sensitivity.JOURNAL OF ECOLOGY,91(2),294-304.
MLA Tweddle, JC,et al."Ecological aspects of seed desiccation sensitivity".JOURNAL OF ECOLOGY 91.2(2003):294-304.
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