Crops ›› 2019, Vol. 35 ›› Issue (1): 121-126.doi: 10.16035/j.issn.1001-7283.2019.01.020

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Effects of Drought Stress on Germination and Physiological Characteristics of Different Quinoa Seeds

Riyu Wen1,Jianxia Liu2,Zhenhua Zhang2,Yaodong Guo1,Xuyao Dai2,Qingguo Jiang1,Lisheng Fan1   

  1. 1 Maize Research Institute, Shanxi Academy of Agricultural Sciences, Xinzhou 034000, Shanxi, China
    2 College of Life Science, Datong University, Datong 037009, Shanxi, China
  • Received:2018-08-07 Revised:2018-12-31 Online:2019-02-15 Published:2019-02-01
  • Contact: Yaodong Guo

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Abstract:

To study drought tolerance of different buckwheat seed germination and seedling growth stages under different drought conditions, the experiments were conducted on the basis of "Xinli No.1 (Black quinoa), Xinli No.2 (White quinoa), and Xinli No.3 (Red quinoa)". Using the method of germination and soil-cultivation in petri dishes, six PEG 6000 concentration gradients (0, 5%, 10%, 15%, 20%, 25%) were set to treat the seeds and seedlings of three types of quinoa. The growth indexes and physiological indicators of seedlings were determined. The results showed that: (1) With the increase of PEG 6000 concentration, the germination potential, germination rate, hypocotyl length and root length of quinoa seeds all showed a decreasing trend, and regression analysis was used to find the concentration of semi-lethal PEG 6000 drought stress. White quinoa was 20.02%, black quinoa was 20.25%, and red quinoa was 24.70%. (2) With the increase of PEG 6000 concentration, the activities of superoxide dismutase and peroxidase of the three buckwheat seedlings showed a trend of rising first and then decreasing. The contents of malondialdehyde (MDA) and proline were similar. The degree of drought stress showed a significant positive correlation to the contents of MDA and proline. This results showed the highest drought-tolerance in red quinoa, followed by black and white quinoa.

Key words: Black quinoa, White quinoa, Red quinoa, Drought stress, Seed germination, Physiological characteristics

Fig.1

Germination potential, germination rate, root length and hypocotyl length of quinoa seeds under different concentrations of PEG 6000 Different letters mean significant difference at the 0.05 level between different treatments of the same cultivar, the same below"

Fig.2

Proline content of three quinoa seeds under different concentrations of PEG 6000"

Fig.3

Malondialdehyde content of quinoa seedlings under simulated drought stress with different concentrations of PEG 6000"

Fig.4

SOD activity of quinoa seedlings under simulated drought stress with different concentrations of PEG 6000"

Fig.5

POD activity of quinoa seedlings under simulated drought stress with different concentrations of PEG 6000"

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