Response of Seed Germination and Embryo Growth to Salt Stress and Drought Stress of Populus euphratica

doi:10.7522/j.issn.1000-694X.2015.00173

JOURNAL OF DESERT RESEARCH ›› 2016, Vol. 36 ›› Issue (6): 1597-1605.DOI: 10.7522/j.issn.1000-694X.2015.00173

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Response of Seed Germination and Embryo Growth to Salt Stress and Drought Stress of Populus euphratica

Zhang Xiao^1,2, Wang Xu⁴, Jiao Peipei^1,3, Li Zhijun^1,2,3

1. Key Laboratory of Protection and Utilization of Biological Resources in Tarim Basin, Xinjiang Production & Construction Corps, Alar 843300, Xinjiang, China;
2. College of Plant Science, Tarim University, Alar 843300, Xinjiang, China;
3. College of Life Science, Tarim University, Alar 843300, Xinjiang, China;
4. College of Agriculture and Bio-technology, China Agricultural University, Beijing 100193, China

Received:2015-08-26 Revised:2015-11-13 Online:2016-11-20 Published:2016-11-20

Abstract

Abstract: The seed germination and embryo growth of Populus euphratica in response to salt and drought stress under optimum temperature and light conditions were determined. The results showed that:(1) The optimum temperature and light condition for P. euphratica seed germination and embryo growth was 25℃/30℃ and 12h light/12h darkness. Although light has negative impact on the growth of radicle and inhibited the elongation of hypocotyl, but benefit for the increasing of cotyledon length and the chlorophyll synthesis of the cotyledon. Lower temperature (10℃/15℃, 15℃/20℃) and higher temperature (35℃/40℃) were not conducive to the length elongation of radicle and cotyledon growth; Temperature has a significant effect on the hypocotyl growth under dark condition. (2) Solutions with different osmotic potential have significant effects on the growth of radicle and cotyledon expansion after germination. When the osmotic potential of solution were between -0.2-0 MPa, the embryo growth was not affected; while, when the osmotic potential was lower than -0.2 MPa, the growth of hypocotyl, cotyledon and radicle were inhibited, especially when the solution potential is lower than -0.6 MPa, the cotyledons' unfolding was inhibited either. -0.2 MPa is a critical osmotic potential for the embryo growth of P. euphratica. (3) The growth of radicle, cotyledon was more sensitive to NaCl stress than seed germination, as the seeds could germinated in NaCl concentration range from 0-0.80 mol·L^-1, while the growth of radicle and cotyledons in NaCl concentration of 0.05 mol·L^-1 were significantly different from the one in the control, and when the solution NaCl concentration is greater than 0.10 mol·L^-1, the cotyledons showed etiolation, and in NaCl concentration range from 0.20-0.80 mol·L^-1, cotyledons cannot unfolding. The fast and concentrated seed germination trait of P. euphratica, is an adaptation strategy to drought and less rainfall environment; while, the influence of drought and salt stress on the embryo growth after germination became the key restrict factors for the seedling reproduction of P. euphratica.

Key words: Populus euphratica, seed germination, embryo growth, salt and drought stress

CLC Number:

S330.2

Zhang Xiao, Wang Xu, Jiao Peipei, Li Zhijun. Response of Seed Germination and Embryo Growth to Salt Stress and Drought Stress of Populus euphratica[J]. JOURNAL OF DESERT RESEARCH, 2016, 36(6): 1597-1605.

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Response of Seed Germination and Embryo Growth to Salt Stress and Drought Stress of Populus euphratica

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