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Publication Type J
Authors Wang, L., Z. Y. Huang, C. C. Baskin, J. M. Baskin and M. Dong
Title Germination of Dimorphic Seeds of the Desert Annual Halophyte Suaeda aralocaspica (Chenopodiaceae), a C-4 Plant without Kranz Anatomy
Source Annals of Botany
Author Keywords Borszczowia cold desert halophyte physiological seed dormancy seed germination Suaeda SALICORNIA-EUROPAEA L ARTHROCNEMUM-INDICUM GROWTH-REGULATORS SALINE CONDITIONS RADICLE GROWTH TEMPERATURE DORMANCY LIGHT CHINA XINJIANG
Abstract Background and Aims Suaeda aralocaspica is a C-4 summer annual halophyte without Kranz anatomy that is restricted to the deserts of central Asia. It produces two distinct types of seeds that differ in colour, shape and size. The primary aims of the present study were to compare the dormancy and germination characteristics of dimorphic seeds of S. aralocaspica and to develop a conceptual model of their dynamics. Methods Temperatures simulating those in the natural habitat of S. aralocaspica were used to test for primary dormancy and germination behaviour of fresh brown and black seeds. The effects of cold stratification, gibberellic acid, seed coat scarification, seed coat removal and dry storage on dormancy breaking were tested in black seeds. Germination percentage and recovery responses of brown seeds, non-treated black seeds and 8-week cold-stratified black seeds to salt stress were tested. Key Results Brown seeds were non-dormant, whereas black seeds had non-deep Type 2 physiological dormancy (PD). Germination percentage and rate of germination of brown seeds and of variously pretreated black seeds were significantly higher than those of non-pretreated black seeds. Exposure of seeds to various salinities had significant effects on germination, germination recovery and induction into secondary dormancy. A conceptual model is presented that ties these results together and puts them into an ecological context. Conclusions The two seed morphs of S. aralocaspica exhibit distinct differences in dormancy and germination characteristics. Suaeda aralocaspica is the first cold desert halophyte for which non-deep Type 2 PD has been documented.
Author Address [Wang, Lei; Huang, Zhenying; Dong, Ming] Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China. [Baskin, Carol C.; Baskin, Jerry M.] Univ Kentucky, Dept Biol, Lexington, KY 40506 USA. [Baskin, Carol C.] Univ Kentucky, Dept Plant & Soil Sci, Lexington, KY 40506 USA. [Wang, Lei] Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China. Huang, ZY, Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China. zhenying@ibcas.ac.cn dongming@ibcas.ac.cn
ISSN 0305-7364
ISBN 0305-7364
29-Character Source Abbreviation Ann. Bot.
Publication Date Nov
Year Published 2008
Volume 102
Issue 5
Beginning Page 757-769
Digital Object Identifier (DOI) 10.1093/aob/mcn158
Unique Article Identifier ISI:000260133300010
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