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Annals of Botany 85: 391-396, 2000
© 2000 Annals of Botany Company

Seed Germination and Radicle Growth of a Halophyte, Kalidium caspicum(Chenopodiaceae)

Kazuo Tobe+, Xaioming Li and Kenji Omasa

Environmental Biology Division, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki, 305-0053, Japan Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, No. 40, South Beijing Road, Urumqi, Xinjiang, 830011, People's Republic of China

Received: 23 August 1999 ; Returned for revision: 27 October 1999 . Accepted: 19 November 1999


  Abstract

Effects of temperature, light, NaCl and polyethylene glycol (PEG)-6000 on seed germination and radicle growth in a halophytic shrub, Kalidium caspicum(L.) Ung.-Sternb. were investigated. When seeds were incubated in deionized water at constant temperatures between 10 and 30°C, the percentage germination in the dark exceeded 75%; light suppressed seed germination at alternating temperatures. Incubating seeds with a hypersaline solution of NaCl for 30 d had no adverse effect on their germinability. The percentage germination of seeds incubated with a –0.8 MPa NaCl solution was 73, 80 and 54% at 10, 20 and 30°C, respectively, but all radicles died before their length exceeded 5 mm. In contrast, when seeds were incubated with a –0.8 MPa PEG solution at 20°C, 68% of seeds germinated, and 95% of the emerging radicles survived beyond 5 mm. The high sensitivity of small radicles of this species to salinity indicated that salt must be removed from the soil surface for seedling establishment.Copyright 2000 Annals of Botany Company

Chinese desert, radicle growth, germination, halophyte, Kalidium caspicum, salinity


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