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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 |
ISSN | 0098-8472 |
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 |
DOI | 10.1016/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 |
EISSN | 1873-7307 |
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 | |
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 |
推荐引用方式 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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