Biodiversity Science ›› 2004, Vol. 12 ›› Issue (6): 572-577.doi: 10.17520/biods.2004072

• Editorial • Previous Article     Next Article

Ecophysiological characteristics of seed germination of the relict plant Metasequoia glyptostroboides

XIN Xia1, 2, JING XinMing1*, SUN HongMei1, LIN Jian1, WANG XiaoFeng3   

  1. 1 Institute of Botany, Chinese Academy of Sciences, Beijing 100093
    2 Graduate School of the Chinese Academy of Sciences,Beijing 100039
    3 Beijing Forestry University,Beijing 100083
  • Received:2004-05-10 Revised:2004-10-27 Online:2004-11-20
  • JING XinMing

Metasequoia glyptostroboides, known as a “living fossil”that was once widely distributed in the Northern Hemisphere, is now only found in a few restricted places in China. Many researches have been done on this species, but few on its seeds. Seed, as a key phase of spermatophyte life cycle, is important for regeneration and dispersal. Seed germination, which can be considered the initiation of the spermatophyte life cycle, is easily affected by environment.We studied the effects of temperature and light on ecophysiological characteristics of seed germination of M. glyptostroboides. Seed samples were collected from Lichuan City, Hubei Province, and stored at -20℃ before the experiment. A temperature gradient from 10℃ to 35℃ was used to study the effect of temperature on seed germination. Germination percentage, vigor index, and activities of dehydrogenase and antioxidant enzymes were used as a measure of seed vigor and stress resistance. The results indicated that temperature had a strong effect on seed vigor and activities of antioxidant enzymes. The germination rate, vigor index,and activities of dehydrogenase and antioxidant enzymes of M. glyptostroboides seeds were higher when temperature ranged from 19℃ to 28℃, whereas seed vigor declined greatly when the temperature was above 32℃ or below 19℃, and little germination was observed below 10℃. Our results imply that a temperature ranging from 19℃ to 28℃ is suitable for seed germination, with an optimum of 24℃. Seed germination was greatly inhibited by light (65μmol·m-2·s-1, 12 h/d), which implied that the germination of M. glyptostroboides seeds requires dark conditions. The seeds were of poor quality with the percentage of empty seed over 90%. The unsuitable temperature in the original habitat of M. glyptostroboides, together with the poor seed quality might be important factors limiting the regeneration of the species, and this might explain the lack of seedlings and saplings in M. glyptostroboides populations.

Key words: macrofauna, biodiversity index, abundance/biomass curves, Jiaozhou Bay

CLC Number: 

  • Q94

[1] Lulu Yan,Lizhe Cai,Xinwei Chen,Guoqiang Li,Wenjun Li,Jiali Zeng,Yiyong Rao. (2016) Functional groups of benthic macrofauna in the 14th Yong intertidal zone of Nansha, Guangzhou . Biodiv Sci, 24(7): 802-810.
[2] Mei Yang,Xinzheng Li,Yong Xu,Hongfa Wang,Baolin Zhang. (2016) Seasonal variations in macrobenthic communities in the subtidal zones of Jiaozhou Bay . Biodiv Sci, 24(7): 820-830.
[3] Bei Huang,Na Wei,Weijie Meng,Mingxia Zhang. (2016) Marine biodiversity evaluation based on the pressure-state-response (PSR) model of Changhai County, Liaoning Province . Biodiv Sci, 24(1): 48-54.
[4] Naicheng Li, Xiaoshou Liu, Zhaodong Xu, Rui Zhao, Honghua Shi. (2015) Biodiversity of macrofauna in the southern waters of Miaodao Archipelago, China . Biodiv Sci, 23(1): 41-49.
[5] Lizhe Cai, Xinwei Chen, Chen Wu, Xin Peng, Jing Cao, Sujing Fu. (2011) Temporal and spatial variation of macrofaunal communities in Shenzhen Bay intertidal zone between 1995 and 2010 . Biodiv Sci, 19(6): 702-709.
[6] Chuanlong Li, Zongqiang Xie, Changming Zhao, Gaoming Xiong, Li Zou. (2007) Effects of point source pollution from a phosphorus chemical factory on terrestrial plant communities in the Three Gorges Reservoir area . Biodiv Sci, 15(5): 523-532.
[8] Wei Yuan, Zhinan Zhang, Zishan Yu. (2007) Macrofaunal diversity in the western Jiaozhou Bay, Shandong . Biodiv Sci, 15(1): 53-60.
[9] Xiuchun Lin, Lizhe Cai, Li Ma, Yang Gao, Li Yang, Weiming Liu. (2006) The macrofaunal community in Fenglin mangrove area, Xiamen . Biodiv Sci, 14(2): 128-135.
[10] Baoquan Li, Xinzheng Li, Hongfa Wang, Baolin Zhang. (2006) Species diversity of macrobenthic mollusk fauna in Jiaozhou Bay, Shan-dong . Biodiv Sci, 14(2): 136-144.
[11] Baoming Ge, Hongyi Cheng, Xiang Zheng, Junmiao Kong, Yixin Bao. (2005) Community structure and diversity of soil macrofauna from different urban greenbelts in Jinhua City, Zhejiang Province . Biodiv Sci, 13(3): 197-203.
[12] LI Xin-Zheng, YU Hai-Yan, WANG Yong-Qiang, SHUAI Lian-Mei, ZHANG Bao-Lin, LIU Rui-Yu. (2001) Study on species diversity of macrobenthic fauna in Jiaozhou Bay . Biodiv Sci, 09(1): 80-84.
[13] ZOU Fa-Sheng, SONG Xiao-Jun, CHEN Wei, ZHENG Xin-Ren, CHEN Jian-Hai. (1999) The diversity of benthic macrofauna on mud flat in Dongzhaigang Mangrove Rserve, Hainan . Biodiv Sci, 07(3): 175-180.
Full text