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Publication Type J
Authors Wang, H. F., L. Kong, R. Gao, B. Abudureheman, X. Y. Li and Q. L. Li
Title Germination biology of dimorphic seeds of the annual halophyte common seepweed (Suaeda glauca)
Source Weed Science
Author Keywords Burial depth cold stratification light osmotic potential pH salt stress temperature environmental-factors seedling emergence ion accumulation salinity ecology growth weed recruitment resistant salt
Abstract Common seepweed [Suaeda glauca (Bunge) Bunge] is a common salt-tolerant weed species distributed across the agricultural regions of northern China. It produces dimorphic seeds with different phenotypic characteristics and seed sizes. However, there is no information regarding the germination biology of these dimorphic seeds. Studies were conducted to evaluate the effects of ecological factors such as temperature, light, pH, osmotic stress, salt concentration, and planting depth on seed germination and seedling emergence. The results showed that brown seeds were nondormant, whereas black seeds had an intermediate physiological dormancy. The germination percentage of brown seeds was more than 80% at all temperature regimes and light conditions, but the optimum germination occurred at the cold thermoperiod of 20/10 C. In contrast, less than 6% of black seeds germinated at all temperature regimes and light conditions. Eight weeks of cold stratification did not break the dormancy of black seeds, whereas low concentrations of gibberellic acid (0.1 and 1.0 mM) significantly increased seed germination. Removal of the testa of black seeds also promoted germination and produced normal seedlings. Brown seeds showed moderate tolerance to salt stress, with 16% germination percentage at a salt concentration of 600 mM NaCl. The germination of brown seeds was 38% at an osmotic potential stress of -0.8 MPa; above that, no germination was obtained. Brown seeds germinated well in a wide pH range (4 to 10), with a germination percentage higher than 95%. Seedling emergence percentage was higher than 90% at burial depths of 0 to 2 cm, while germination percentage severely decreased for brown seeds with burial depths >2 cm, indicating that shallow tillage could be an effective measure to minimize seed germination. Information gathered from this study will help to develop an effective protocols for controlling S. glauca.
Author Address [Wang, Hongfei; Kong, Lin; Li, Xinyang; Li, Qiuli] Liaoning Normal Univ, Sch Life Sci, 850 Huanghe Rd, Dalian, Peoples R China. [Gao, Rui] Dandong Forestry & Grassland Dev Serv Ctr, Dandong, Peoples R China. [Abudureheman, Buhailiqiemu] Xinjiang Univ, Inst Sci & Technol, Aksu Campus, Aksu, Peoples R China. Li, QL (reprint author), Liaoning Normal Univ, Sch Life Sci, 850 Huanghe Rd, Dalian, Peoples R China. skyliqiuli@163.com
ISSN 0043-1745
ISBN 0043-1745
29-Character Source Abbreviation Weed Sci.
Publication Date Mar
Year Published 2020
Volume 68
Issue 2
Beginning Page 143-150
Digital Object Identifier (DOI) 10.1017/wsc.2019.74
Unique Article Identifier WOS:000524940200005
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