Seed germination and seedling growth responses of invasive alien plant Aegilops tauschii to saline-alkali stress

doi:10.3969/j.issn.1000-2006.201907013

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2020, Vol. 44 ›› Issue (5): 167-173.doi: 10.3969/j.issn.1000-2006.201907013

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Seed germination and seedling growth responses of invasive alien plant Aegilops tauschii to saline-alkali stress

WANG Ning¹(), YUAN Meili²

1. College of Forestry,Henan University of Science and Technology,Luoyang 471023,China
2. The Sui & Tang Dynasties Relics Botanic Garden of Luoyang,Luoyang 471002,China;

Received:2019-07-10 Revised:2020-03-09 Online:2020-10-30 Published:2020-10-30

Abstract

Abstract:

【Objective】Aegilops tauschii Coss. invasion has seriously threatened the security of wheat production in China. In order to forecast the A. tauschii invasion risk, clarify the adaptability of A. tauschii to saline-alkali habitats. 【Method】The stress effects of NaCl and Na₂CO₃ at different concentrations [0 (CK), 50, 100, 150 and 200 mmol/L] on seed germination and seedling growth of A. tauschii. 【Result】Germination rate, and radicle and embryo lengths decreased continuously with an increase in the saline-alkali concentration. At concentrations of 150 and 100 mmol/L, the germination rate decreased significantly in comparison with CK for the NaCl and Na₂CO₃ treatments, respectively. None of the A. tauschii seeds germinated at a Na₂CO₃ concentration of 200 mmol/L. In addition, both the germination rate and seedling growth under Na₂CO₃ stress were significantly lower than those under NaCl stress at the same treatment concentrations. The proline content and superoxide dismutase (SOD) activity increased significantly with an increase in concentration of the saline-alkali treatment solutions. However, the relative electric conductivity and malondialdehyde (MDA) content showed no significant increase at low concentrations of the saline-alkali treatments but increased sharply at high concentrations. This suggests that A. tauschii can adapt biochemically to a certain range of saline-alkali stress through self-regulation. In addition, the values for these biochemical indexes under Na₂CO₃ stress were significantly higher than under NaCl stress at the same treatment concentrations. 【Conclusion】These results indicate that A. tauschii has a certain physiological ability to adapt to saline-alkali habitats, and the effects of Na₂CO₃ stress on seed germination and seedling growth were more significant than those of NaCl stress.

Key words: Aegilops tauschii Coss., salt-alkaline stresses, seed germination, seedling growth

CLC Number:

Q945

WANG Ning, YUAN Meili. Seed germination and seedling growth responses of invasive alien plant Aegilops tauschii to saline-alkali stress[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY, 2020, 44(5): 167-173.

Figures/Tables 4

References 40

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Seed germination and seedling growth responses of invasive alien plant Aegilops tauschii to saline-alkali stress

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