Crops ›› 2017, Vol. 33 ›› Issue (1): 119-126.doi: 10.16035/j.issn.1001-7283.2017.01.022

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Effects of Iso-osmotic NaCl and PEG Stress and Rewatering on Seed Germination and Seedling Growth of Quinoa

Zhang Ziwei1,Pang Chunhua1,Zhang Yongqing1,2,Ni Ruijun1,Yang Shifang1,Wang Luyuan3,Liu Liqin1   

  1. 1College of Life Sciences,Shanxi Normal University,Linfen 041004,Shanxi,China
    2College of Geographical Sciences,Shanxi Normal University,Linfen 041004,Shanxi,China
    3Modern College of Arts and Sciences,Shanxi Normal University,Linfen 041004,Shanxi,China
  • Received:2016-10-13 Revised:2016-12-15 Online:2017-02-15 Published:2018-08-26

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Abstract:

The effects of iso-osmotic NaCl and PEG and re-watering on seed germination and growth of quinoa were examined to explore strategies of germination and seedling growth under drought and salt stress. Results showed: (1)When water potential was lower than -0.6 MPa, the inhibitory effect of PEG on seed germination was significantly higher than that of NaCl, and seeds could not germinate under -2.3MPa NaCl and -1.0MPa PEG, respectively. With the water potential decreasing, the initial germination time and germination period were prolonged, and then shortened regardless of NaCl and PEG, and germination time under PEG stress was longer than that of NaCl under the same water potential; (2)There were no seedlings appeared when the water potential decreased to -1.8MPa NaCl and -0.8MPa PEG, respectively, and seedling growth showed a trend of low promotion and high inhibition. Compared with CK , root length was significantly shortened when water potential was lower than -0.6MPa NaCl or -0.8MPa PEG, the shoot length and fresh weight of root, shoot and seedling were significantly decreased with water potential lower than -1.4MPa NaCl or -0.6MPa PEG; (3)The effects of rewatering on seedling growth were different under drought and salt stress. Under the NaCl treatments, the length of root, shoot and seedling could be restored to the control level when the water potential was higher than -1.0, -1.4 or -1.0MPa, The weight of root, shoot and seedling could be restored to the control level when the water potential was higher than -1.0, -1.8 or -1.4MPa, which even were longer and heavier than those of the control. Seedling length and fresh weight were individually restored to the control level or even were longer and heavier than those of the control under drought stress. (4)Under drought or salt stress, high plasticity was showed in biomass allocation. Biomass was little allocated to root under high salt, contrariwise in low salt, allocation ratio of root or shoot was enhanced after rewatering, indicating occurance of compensation effect. With the aggravation of drought, the allocation ratio of root length or biomass were increased with no significant effect. Our results suggest that quinoa is of strong salt- and drought-tolerance and the capability coping with environmental changes. And thus, it is a potential crop on Loess Plateau.

Key words: Quinoa, Rewatering, Water-salt stress, Seed germination, Seedling growth

Fig.1

The cummulative germination percentage of quinoa seeds with different water potentials of NaCl and PEG treatments Different letters above the columns indicate significant differences among treatments at 0.05 level, the same below"

Fig.2

Effects of rewatering on the root, shoot, and seedling length of quinoa seedling under NaCl and PEG treatments"

Fig.3

Effects of rewatering on root/seedling length and shoot/seedling length of quinoa seedling under NaCl and PEG treatments"

Fig.4

Effects of rewatering on the shoot and root fresh weight of quinoa seedling under NaCl and PEG treatments"

Fig.5

Effects of rewatering on ratio of the shoot and root fresh weight of quinoa seedling under NaCl and PEG treatments"

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