Effect of temperature, light and salinity on seed germination and radicle growth of the geographically widespread halophyte shrub Halocnemum strobilaceum

Xiao Xia Qu, Zhen Ying Huang, Jerry M. Baskin, Carol C. Baskin

Research output: Contribution to journalArticlepeer-review

128 Scopus citations

Abstract

• Background and Aims: The small leafy succulent shrub Halocnemum strobilaceum occurs in saline habitats from northern Africa and Mediterranean Europe to western Asia, and it is a dominant species in salt deserts such as those of north-west China. The effects of temperature, light/darkness and NaCl salinity were tested on seed germination, and the effects of salinity were tested on seed germination recovery, radicle growth and radicle elongation recovery, using seeds from north-west China; the results were compared with those previously reported on this species from 'salt steppes' in the Mediterranean region of Spain. • Methods: Seed germination was tested over a range of temperatures in light and in darkness and over a range of salinities at 25°C in the light. Seeds that did not germinate in the NaCl solutions were tested for germination in deionized water. Seeds from which radicles had barely emerged in deionized water were transferred to NaCl solutions for 10 d and then back to deionized water for 10 d to test for radicle growth and recovery. • Key Results: Seeds germinated to higher percentages in light than in darkness and at high than at low temperatures. Germination percentages decreased with an increase in salinity from 0.1 to 0.75 m NaCl. Seeds that did not germinate in NaCl solutions did so after transfer to deionized water. Radicle elongation was increased by low salinity, and then it decreased with an increase in salinity, being completely inhibited by ≥2.0 m NaCl. Elongation of radicles from salt solutions <3.0 m resumed after seedlings were transferred to deionized water. • Conclusions: The seed and early seedling growth stages of the life cycle of H. strobilaceum are very salt tolerant, and their physiological responses differ somewhat between the Mediterranean 'salt steppe' of Spain and the inland cold salt desert of north-west China.

Original languageEnglish
Pages (from-to)293-299
Number of pages7
JournalAnnals of Botany
Volume101
Issue number2
DOIs
StatePublished - Jan 2008

Bibliographical note

Funding Information:
This study was funded by the Knowledge Innovation project from the Chinese Academy of Sciences (KZCX2-YW-431) and the National Natural Science Foundation (30570281, 30330130) of PR China. Fukang Desert Ecological Station of the Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, provided assistance for collection of seeds and soil samples.

Keywords

  • Halocnemum strobilaceum
  • Halophyte
  • Inland salt desert
  • Radicle growth
  • Radicle growth recovery
  • Seed germination
  • Seed germination recovery

ASJC Scopus subject areas

  • General Medicine

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