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Morphophysiological dormancy synchronizes timing of seed germination of two alpine species of Meconopsis on the Tibetan Plateau to beginning of growing season
Wang, Guoyan1,2; Baskin, Carol C.; Baskin, Jerry M.; Yang, Xuejun; Liu, Guofang; Ye, Xuehua; Huang, Zhenying
2021
发表期刊ENVIRONMENTAL AND EXPERIMENTAL BOTANY
ISSN0098-8472
卷号187
摘要Timing of seed germination is critical for seedling establishment and growth of the plant to maturity. Theoretically, then, germination of alpine species should be restricted to a period that ensures seedlings will reach a critical size during the short growing season for overwinter survival. We hypothesized that seeds of two alpine monocarpic perennials of Meconopsis germinate only at the beginning of the growing season in early spring and that dormancy synchronizes the timing of germination to this period. We tested the effects of light, temperature, cold stratification and GA3 on germination of Meconopsis integrifolia and M. racemosa in the laboratory and germination responses to temperature during two 2-year periods of seed buried at 4450 m a.s.l. on the Tibetan Plateau. Most fresh seeds of both species were dormant, and the embryo underdeveloped, indicating morphophysiological dormancy (MPD). GA3 promoted embryo growth and germination of seeds. Buried seeds exhibited an annual dormancy cycle. The physiological component of MPD was released gradually in the field during autumn and winter, resulting in embryo growth (release of morphological component of MPD) and germination just after snowmelt in spring. Embryos in seeds that did not germinate the first year remained underdeveloped until the second spring. Delay of seed burial from October until January (simulating a delay in time of seed dispersal) delayed germination for 1 year but did not change the germination season. Thus, our hypothesis that MPD restricts germination to the beginning of the growing season is supported.
关键词Buried seeds Dispersal time Dormancy cycling Meconopsis Secondary dormancy Underdeveloped embryo
学科领域Plant Sciences ; Environmental Sciences
DOI10.1016/j.envexpbot.2021.104473
收录类别SCI
语种英语
WOS关键词ENDANGERED HIMALAYAN ; ECOPHYSIOLOGY ; REQUIREMENTS ; TEMPERATURE ; RECRUITMENT ; POPPY ; SOIL
WOS研究方向Science Citation Index Expanded (SCI-EXPANDED)
WOS记录号WOS:000651248600006
出版者PERGAMON-ELSEVIER SCIENCE LTD
文献子类Article
出版地OXFORD
EISSN1873-7307
资助机构National Natural Science Foundation of P. R. China [31861143024, 31870711, 31860123] ; Second Tibetan Plateau Scientific Expedition and Research Program of P. R. China [2019QZKK0301]
作者邮箱zhenying@ibcas.ac.cn
引用统计
被引频次:2[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ibcas.ac.cn/handle/2S10CLM1/26669
专题植被与环境变化国家重点实验室
作者单位1.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China
2.Chengdu Univ Technol, Inst Ecol Resources & Landscape Architecture, Chengdu 610051, Peoples R China
3.Tibet Agr & Anim Husb Univ, Coll Resource & Environm, Linzhi 860000, Tibet, Peoples R China
4.Baskin, Carol C.; Baskin, Jerry M.] Univ Kentucky, Dept Biol, Lexington, KY 40506 USA
5.Baskin, Carol C.] Univ Kentucky, Dept Plant & Soil Sci, Lexington, KY 40546 USA
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GB/T 7714
Wang, Guoyan,Baskin, Carol C.,Baskin, Jerry M.,et al. Morphophysiological dormancy synchronizes timing of seed germination of two alpine species of Meconopsis on the Tibetan Plateau to beginning of growing season[J]. ENVIRONMENTAL AND EXPERIMENTAL BOTANY,2021,187.
APA Wang, Guoyan.,Baskin, Carol C..,Baskin, Jerry M..,Yang, Xuejun.,Liu, Guofang.,...&Huang, Zhenying.(2021).Morphophysiological dormancy synchronizes timing of seed germination of two alpine species of Meconopsis on the Tibetan Plateau to beginning of growing season.ENVIRONMENTAL AND EXPERIMENTAL BOTANY,187.
MLA Wang, Guoyan,et al."Morphophysiological dormancy synchronizes timing of seed germination of two alpine species of Meconopsis on the Tibetan Plateau to beginning of growing season".ENVIRONMENTAL AND EXPERIMENTAL BOTANY 187(2021).
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