Effects of NaCl and Na2SO4 stress on content and distribution of K + and Na + of Echinochloa frumentacea seedlings

doi:10.3969/j.issn.1004-1524.2021.03.03

Acta Agriculturae Zhejiangensis ›› 2021, Vol. 33 ›› Issue (3): 396-403.DOI: 10.3969/j.issn.1004-1524.2021.03.03

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Effects of NaCl and Na₂SO₄ stress on content and distribution of K ⁺ and Na ⁺ of Echinochloa frumentacea seedlings

LU Anqiao^a, ZHANG Fengju^b, WANG Xueqin^b, XU Xing^a^,^b^,^*()

a. College of Agronomy, Ningxia University, Ningxia 750021, China
b. Institute of Environment Engineering, Ningxia University, Ningxia 750021, China

Received:2020-08-28 Online:2021-03-25 Published:2021-03-25
Contact: XU Xing

Abstract

Abstract:

In order to explore the characteristic of K ⁺ and Na ⁺ absorption and distribution at seedling stage of Echinochloa frumentacea under salt stress. The variety Haizi-1 was used as test material, eight different concentrations (0, 25, 50, 75, 100, 125, 150, 200 mmol·L ^-1) of NaCl and Na₂SO₄ were set to simulate conditions of salt stress in this study. The results showed that with the increase of NaCl and Na₂SO₄ concentration, Na ⁺ content was increased, K ⁺ content was decreased, K ⁺/Na ⁺ ratio were all decreased in leaf, stem sheath and root; Content and distribution of Na ⁺ was root>stem sheath>leaf, Na ⁺ content in leaf and stem sheath were significantly lower than that in root. K ⁺/Na ⁺ ratio in leaf and stem sheath was higher than that in root. Content and distribution of K ⁺ was stem sheath>root>leaf under low salt concentration, and under the medium and high salt concentration, content and distribution of K ⁺ was stem sheath>leaf>root. Transport selectivity coefficient from root to stem sheath of K ⁺ and Na ⁺ (ST1_{K, Na}) and transport selectivity coefficient from stem sheath to leaf of K ⁺ and Na ⁺ (ST2_{K, Na}) under salt stress were significantly higher than those of the control at salt concentration>25 mmol·L ^-1, and ST1_{K, Na} was higher than ST2_{K, Na}. When the salt concentration was≥125 mmol·L ^-1, K ⁺/Na ⁺ ratio became stable in above ground under Na₂SO₄ stress, K ⁺ content in stem sheath and root and ST1_K,Na were higher than those under the same concentration of NaCl stress, and Na ⁺ content in leaf and stem sheath were lower than that under the same concentration of NaCl stress. ST2_{K, Na} showed an upward trend under Na₂SO₄ stress, and increased firstly and then decreased under NaCl stress. In conclusion, it had been shown that under salt stress, root system of E. frumentacea had a strong restriction on sodium ion transport to the above-ground part and had higher selective absorption capacity for K ⁺, and it had more tolerance to Na₂SO₄ stress than NaCl stress under higher concentration of salt stress.

Key words: salt stress, Echinochloa frumentacea, seedlings stage, K ⁺, Na ⁺, transport selectivity coefficient

CLC Number:

S516

LU Anqiao, ZHANG Fengju, WANG Xueqin, XU Xing. Effects of NaCl and Na₂SO₄ stress on content and distribution of K ⁺ and Na ⁺ of Echinochloa frumentacea seedlings[J]. Acta Agriculturae Zhejiangensis, 2021, 33(3): 396-403.

Figures/Tables 4

Fig.1 Effect of salt stress on K+ content in different organs of Echinochloa frumentacea seedlings Different letters above bars indicated significant differences at P<0.05 under the same salt stress among different salt concentrations. The same as below.

Fig.2 Effect of salt stress on Na+ content in different organs of Echinochloa frumentacea seedlings

Table 1 Effect of salt stress on K+/Na+ ratio in different organs of the Echinochloa frumentacea seedlings

处理浓度 Treatment concentration/ (mmol·L^-1)	NaCl			Na₂SO₄
处理浓度 Treatment concentration/ (mmol·L^-1)	叶片K⁺/Na⁺ K⁺/Na⁺ in leaf	茎鞘 K⁺/Na⁺ K⁺/ $N a +$ in stem and sheath	根系K⁺/Na⁺ K⁺/Na⁺ in root	叶片K⁺/Na⁺ K⁺/Na⁺ in leaf	茎鞘K⁺/Na⁺ K⁺/Na⁺ in stem and sheath	根系K⁺/Na⁺ K⁺/Na⁺ in root
0	3.54±0.062 a	5.03±0.110 a	3.13±0.022 a	3.54±0.062 a	5.03±0.110 a	3.13±0.022 a
25	0.96±0.043 b	1.12±0.054 b	0.69±0.001 b	0.99±0.049 b	0.98±0.006 b	0.58±0.003 b
50	0.79±0.005 c	0.86±0.004 c	0.51±0.003 c	0.66±0.003 c	0.64±0.002 c	0.38±0.001 c
75	0.62±0.004 d	0.55±0.004 d	0.31±0.003 d	0.45±0.006 d	0.44±0.002 d	0.26±0.004 d
100	0.55±0.003 e	0.43±0.003 e	0.23±0.002 e	0.36±0.019 e	0.35±0.007 e	0.20±0.005 e
125	0.40±0.004 f	0.32±0.004 f	0.19±0.0001 f	0.36±0.003 e	0.34±0.001 e	0.17±0.001 f
150	0.33±0.009 g	0.27±0.006 f	0.16±0.006 g	0.37±0.004 e	0.35±0.004 e	0.16±0.001 fg
200	—	—	—	0.35±0.081 e	0.26±0.007 f	0.15±0.002 g

Table 1 Effect of salt stress on K+/Na+ ratio in different organs of the Echinochloa frumentacea seedlings

处理浓度 Treatment concentration/ (mmol·L^-1)	NaCl			Na₂SO₄
处理浓度 Treatment concentration/ (mmol·L^-1)	叶片K⁺/Na⁺ K⁺/Na⁺ in leaf	茎鞘 K⁺/Na⁺ K⁺/ $N a +$ in stem and sheath	根系K⁺/Na⁺ K⁺/Na⁺ in root	叶片K⁺/Na⁺ K⁺/Na⁺ in leaf	茎鞘K⁺/Na⁺ K⁺/Na⁺ in stem and sheath	根系K⁺/Na⁺ K⁺/Na⁺ in root
0	3.54±0.062 a	5.03±0.110 a	3.13±0.022 a	3.54±0.062 a	5.03±0.110 a	3.13±0.022 a
25	0.96±0.043 b	1.12±0.054 b	0.69±0.001 b	0.99±0.049 b	0.98±0.006 b	0.58±0.003 b
50	0.79±0.005 c	0.86±0.004 c	0.51±0.003 c	0.66±0.003 c	0.64±0.002 c	0.38±0.001 c
75	0.62±0.004 d	0.55±0.004 d	0.31±0.003 d	0.45±0.006 d	0.44±0.002 d	0.26±0.004 d
100	0.55±0.003 e	0.43±0.003 e	0.23±0.002 e	0.36±0.019 e	0.35±0.007 e	0.20±0.005 e
125	0.40±0.004 f	0.32±0.004 f	0.19±0.0001 f	0.36±0.003 e	0.34±0.001 e	0.17±0.001 f
150	0.33±0.009 g	0.27±0.006 f	0.16±0.006 g	0.37±0.004 e	0.35±0.004 e	0.16±0.001 fg
200	—	—	—	0.35±0.081 e	0.26±0.007 f	0.15±0.002 g

Fig.3 Effect of salt stress on K+, Na+ transport selectivity coefficient of the Echinochloa frumentacea seedling

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Effects of NaCl and Na₂SO₄ stress on content and distribution of K ⁺ and Na ⁺ of Echinochloa frumentacea seedlings

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