Arid
DOI10.1017/S0960258518000363
Alleviation of morphophysiological dormancy in seeds of the Australian arid-zone endemic shrub, Hibbertia glaberrima F. Muell. (Dilleniaceae)
Dalziell, Emma L.1,2,3; Erickson, Todd E.1,2; Hidayati, Siti N.4; Walck, Jeffrey L.4; Merritt, David J.1,2
通讯作者Dalziell, Emma L.
来源期刊SEED SCIENCE RESEARCH
ISSN0960-2585
EISSN1475-2735
出版年2018
卷号28期号:4页码:286-293
英文摘要

Morphophysiological dormancy (MPD) is predominantly found in seeds of temperate regions and is uncommon in arid biomes. MPD has been reported in a number of Hibbertia (Dilleniaceae) species of temperate Australia, and in a single species of the arid zone, H. glaberrima. This study aimed to examine the dormancy and germination ecology of seeds of H. glaberrima. Seeds were subjected to temperature stratification treatments designed to mimic summer and autumn conditions in the Pilbara region of Western Australia. Seed germination and embryo growth were measured. We also tested the interaction between temperature stratification and cycles of drying and wetting designed to mimic sporadic rainfall events. All temperature and moisture treatments were tested in combination (+/-) with the smoke-derived chemical karrikinolide (KAR(1)). Exposing dormant seeds to temperatures suitable for warm stratification (35 degrees C) for >= 8 weeks, followed by incubation at 25 degrees C, resulted in significantly higher germination compared with non-stratified seeds. Exposing seeds to dry/wet cycling in conjunction with temperature stratification did not significantly increase germination. Exposure to KAR(1) increased germination under most conditions. Once seeds are shed during October to December, they are exposed to hot and sporadically wet conditions over summer, allowing MPD to be overcome in a proportion of the seed population. Seeds may germinate in autumn (March to April), in conjunction with cooler temperatures. More deeply dormant individuals may require more than one summer to overcome dormancy. Similar to other species occurring in fire-prone ecosystems, fire also plays a crucial role in the germination ecology of H. glaberrima.


英文关键词dormancy classification dryland embryo growth germination karrikinolide rehabilitation restoration
类型Article
语种英语
国家Australia ; USA
收录类别SCI-E
WOS记录号WOS:000455656500005
WOS关键词CLASSIFICATION-SYSTEM ; GERMINATION ; SMOKE ; REHABILITATION
WOS类目Plant Sciences
WOS研究方向Plant Sciences
来源机构University of Western Australia
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/213141
作者单位1.Kings Pk Sci, Dept Biodivers Conservat & Attract, Kings Pk, WA 6005, Australia;
2.Univ Western Australia, Sch Biol Sci, Crawley, WA 6009, Australia;
3.Curtin Univ, Sch Mol & Life Sci, Bentley, WA 6102, Australia;
4.Middle Tennessee State Univ, Dept Biol, Murfreesboro, TN 37132 USA
推荐引用方式
GB/T 7714
Dalziell, Emma L.,Erickson, Todd E.,Hidayati, Siti N.,et al. Alleviation of morphophysiological dormancy in seeds of the Australian arid-zone endemic shrub, Hibbertia glaberrima F. Muell. (Dilleniaceae)[J]. University of Western Australia,2018,28(4):286-293.
APA Dalziell, Emma L.,Erickson, Todd E.,Hidayati, Siti N.,Walck, Jeffrey L.,&Merritt, David J..(2018).Alleviation of morphophysiological dormancy in seeds of the Australian arid-zone endemic shrub, Hibbertia glaberrima F. Muell. (Dilleniaceae).SEED SCIENCE RESEARCH,28(4),286-293.
MLA Dalziell, Emma L.,et al."Alleviation of morphophysiological dormancy in seeds of the Australian arid-zone endemic shrub, Hibbertia glaberrima F. Muell. (Dilleniaceae)".SEED SCIENCE RESEARCH 28.4(2018):286-293.
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