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Journal of Plant Research

, Volume 118, Issue 3, pp 207–214 | Cite as

The effect of plant growth regulators, nitric oxide, nitrate, nitrite and light on the germination of dimorphic seeds of Suaeda salsa under saline conditions

  • Weiqiang LiEmail author
  • Xiaojing Liu
  • M. Ajmal Khan
  • Shinjiro Yamaguchi
Original Article

Abstract

Suaeda salsa, a leaf succulent shrub in the family Chenopodiaceae, is one of the most important halophytes in China. Suaeda salsa produces dimorphic seeds (soft brown seeds and hard black seeds). Seeds of S. salsa were collected from the coastal salt flats near Huanghua City, China. Experiments were conducted to determine the salinity-alleviating effect of plant growth regulators, nitric oxide, nitrate, nitrite and light on the germination of dimorphic seeds of S. salsa. Brown seeds had a higher germination rate than black seeds in all experiments. Black seeds were more sensitive to salt in the absence of light in comparison to brown seeds. Brown seeds absorbed water more quickly in comparison to black seeds and were found to be more tolerant of salt stress. Our results showed that 1-aminocyclopropane-1-carboxylate (ACC, the immediate precursor of ethylene), nitrite, GA4 and BA improved seed germination in the presence of salt. However, nitrate, GA1, GA3 failed to alleviate salt stress. ABA inhibited seed germination and seedling growth. Possible mechanisms involved in the alleviation of salt stress in S. salsa seeds and the ecological adaptation of the seeds to the environment are discussed.

Keywords

Dimorphic seed Germination Plant growth regulator Suaeda salsa 

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Copyright information

© The Botanical Society of Japan and Springer-Verlag 2005

Authors and Affiliations

  • Weiqiang Li
    • 1
    Email author
  • Xiaojing Liu
    • 1
  • M. Ajmal Khan
    • 2
  • Shinjiro Yamaguchi
    • 3
  1. 1.Shijiazhuang Institute of Agricultural ModernizationChinese Academy of ScienceShijiazhuangThe People’s Republic of China
  2. 2.Department of BotanyUniversity of KarachiKarachiPakistan
  3. 3.Plant Science Center, RIKENInstitute of Physical and Chemical ResearchTsurumi-ku, Yokohama, KanagawaJapan

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