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Publication Type J
Authors Qu, X. X., Z. Y. Huang, J. M. Baskin and C. C. Baskin
Title Effect of temperature, light and salinity on seed germination and radicle growth of the geographically widespread halophyte shrub Halocnemum strobilaceum
Source Annals of Botany
Author Keywords Halocnemum strobilaceum halophyte inland salt desert radicle growth radicle growth recovery seed germination seed germination recovery ARTEMISIA-MONOSPERMA SOUTHEASTERN SPAIN CHENOPODIACEAE ASTERACEAE RESPONSES RECOVERY STRESS CHINA
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 degrees 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 saltsolutions < 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.
Author Address [Qu, Xiao-Xia; Huang, Zhen-Ying] Chinese Acad Sci, Inst Bot, Lab Quantitat Vegetat Ecol, Beijing 100093, Peoples R China. [Qu, Xiao-Xia] Grad Univ, Chinese Acad Sci, Beijing 100049, Peoples R China. [Qu, Xiao-Xia; Baskin, Jerry M.; Baskin, Carol C.] Univ Kentucky, Dept Biol, Lexington, KY 40506 USA. [Baskin, Carol C.] Univ Kentucky, Dept Plant & Soil Sci, Lexington, KY 40546 USA. Huang, ZY, Chinese Acad Sci, Inst Bot, Lab Quantitat Vegetat Ecol, Beijing 100093, Peoples R China. zhenying@ibcas.ac.cn ccbask0@uky.edu
ISSN 0305-7364
ISBN 0305-7364
29-Character Source Abbreviation Ann. Bot.
Publication Date Jan
Year Published 2008
Volume 101
Issue 2
Beginning Page 293-299
Digital Object Identifier (DOI) 10.1093/aob/mcm047
Unique Article Identifier ISI:000252125400010
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