NEIGAE OpenIR
Seed dormancy regulates germination response to smoke and temperature in a rhizomatous evergreen perennial
H. Y. Ma, T. E. Erickson and D. J. Merritt
2018
发表期刊Aob Plants
卷号10
摘要Seed dormancy status regulates the response of seeds to environmental cues that can trigger germination. Anigozanthos flavidus (Haemodoraceae) produces seeds with morphophysiological dormancy (MPD) that are known to germinate in response to smoke, but embryo growth dynamics and germination traits in response to temperatures and after-ripening have not been well characterized. Seeds of A. flavidus, after-ripened for 28 months at 15 degrees C/15 % relative humidity, were incubated on water agar, water agar containing 1 mu M karrikinolide (KAR(1)) or 50 mu M glyceronitrile at 5, 10, 15, 20, 25, 20/10 and 25/15 degrees C for 28 days. After incubation at 5, 10 and 25 degrees C for 28 days, seeds were transferred to 15 degrees C for another 28 days. Embryo growth dynamics were tested at 5, 10, 15 and 25 degrees C. Results demonstrated that fresh seeds of A. flavidus had MPD and the physiological dormancy (PD) component could be broken by either glyceronitrile or dry after-ripening. After-ripened seeds germinated to >= 80 % at 15-20 degrees C while no additional benefit of germination was observed in the presence of the KAR(1) or glyceronitrile. Embryo length significantly increased at 10 degrees C, and only slightly increased at 5 degrees C, while growth did not occur at 25 degrees C. When un-germinated seeds were moved from 5-10 degrees C to 15 degrees C for a further 28 days, germination increased from 0 to >80 % in significantly less time indicating that cold stratification may play a key role in the germination process during winter and early spring in A. flavidus. The lower germination (<50 %) of seeds moved from 25 to 15 degrees C was produced by the induction of secondary dormancy. Induction of secondary dormancy in seeds exposed to warm stratification, a first report for Anigozanthos species, suggests that cycling of PD may be an important mechanism of controlling germination timing in the field.
文献类型期刊论文
条目标识符http://ir.iga.ac.cn/handle/131322/9248
专题中国科学院东北地理与农业生态研究所
作者单位中国科学院东北地理与农业生态研究所
推荐引用方式
GB/T 7714
H. Y. Ma, T. E. Erickson and D. J. Merritt. Seed dormancy regulates germination response to smoke and temperature in a rhizomatous evergreen perennial[J]. Aob Plants,2018,10.
APA H. Y. Ma, T. E. Erickson and D. J. Merritt.(2018).Seed dormancy regulates germination response to smoke and temperature in a rhizomatous evergreen perennial.Aob Plants,10.
MLA H. Y. Ma, T. E. Erickson and D. J. Merritt."Seed dormancy regulates germination response to smoke and temperature in a rhizomatous evergreen perennial".Aob Plants 10(2018).
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