沙地盐胁迫对油莎豆幼苗生理生长影响的模拟研究

doi:10.13866/j.azr.2022.06.17

Abstract

Abstract:

To investigate the growth and physiological responses of Cyperus esculentus to salt stress in wind-sand soil, a pot experiment with eolian sandy soil as the growth medium was conducted to examine the effects of different degrees of salt stress (NaCl solution) on the growth, physiological and biochemical characteristics, and the balances of Na⁺ and K⁺ in root and leaves in a greenhouse on days 30 and 50 of stress exposure. The results showed that: (1) When the NaCl concentration was ≤0.5 g·kg^-1, both the aboveground and underground dry weights of C. esculentus seedlings were significantly unaffected. However, plant height declined significantly compared with the non-stress seedlings. When NaCl the concentration was ≥1.0 g·kg^-1, the dry weights of aboveground and underground, plant height, and leaf area decreased significantly with stress time. (2) On day 30, under salt stress, the proline content increased significantly with the NaCl concentration, but soluble and protein contents increased slightly. However, MDA content increased significantly under 0.5 g·kg^-1 NaCl treatment and decreased significantly with increasing NaCl concentration. Under salt stress on day 50, as the NaCl concentration increased, the soluble protein content increased significantly. Then, soluble sugar content increased significantly firstly and then remained stable, while the contents of proline and MDA only increased significantly at 3.5 g·kg^-1 NaCl. (3) The Na⁺ content and Na⁺/K⁺ in leaves and roots increased significantly as the NaCl concentration increased, while the K⁺ content decreased significantly and then remained stable when the NaCl concentration was >1.0 g·kg^-1. These results suggest that increased proline content at the early growth stage, while increased contents of soluble protein and sugar at the late growth stage, contribute to increasing the osmotic adjustment and water-holding capacity and decreasing the MDA content and K⁺ loss, improving the salt tolerance of C. esculentus in sandy soil. The comprehensive evaluation results showed that when the NaCl concentration was ≤0.5 g·kg^-1, no effect of salt stress on the growth of C. esculentus seedling was found, while the plant growth was inhibited significantly when the concentration was >1.0 g·kg^-1.

Key words: Cyperus esculentus, salt stress, growth of seedlings, osmotic adjustment, ion content

MA Xingyu,HUANG Caibian,ZENG Fanjiang,LI Xiangyi,ZHANG Yulin,DING Ya,GAO Yanju,XU Mengqi. To simulate the growth and physiological responses of Cyperus esculentus seedlings to salt stress in sandy soil[J].Arid Zone Research, 2022, 39(6): 1862-1874.

Figures/Tables 7

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References 54

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土壤盐渍化程度	非盐渍土	轻度盐胁迫	中度盐胁迫	重度盐胁迫	盐土
Cl^-含量/(g·kg^-1)	<0.20	0.20~0.40	0.40~1.00	1.00~2.00	≥2.00
NaCl含量/(g·kg^-1)	<0.3	0.33~0.66	0.66~1.65	1.65~3.30	≥3.30

处理时间/d	NaCl 胁迫处理	地上部分干重 /(g·株^-1)	地下部分干重 /(g·株^-1)	株高 /cm	单株叶面积 /(cm²·株^-1)	相对含水量/%	脯氨酸 /(mg·g^-1)	可溶性糖 /(mg·g^-1)	可溶性蛋白 /(mg·g^-1)	MDA /(μmol·g^-1)	K⁺ /(mg·g^-1)	Na⁺ /(mg·g^-1)	Na⁺/K⁺	隶属函数平均值	排序
30	CK	0.79	0.45	0.86	0.82	0.53	0.81	0.18	0.36	0.30	0.96	0.99	0.99	0.67	1
	S₁	0.72	0.89	0.44	0.81	0.79	0.61	0.48	0.71	0.07	0.38	0.86	0.85	0.63	2
	S₂	0.45	0.43	0.27	0.46	0.24	0.59	0.83	0.56	0.23	0.29	0.68	0.67	0.47	3
	S₃	0.44	0.35	0.02	0.32	0.40	0.25	0.69	0.79	0.34	0.19	0.50	0.49	0.40	4
	S₄	0.18	0.46	0.17	0.04	0.10	0.17	0.44	0.81	0.88	0.10	0.08	0.05	0.29	5
50	CK	0.80	0.71	0.88	0.76	0.26	0.52	0.25	0.07	0.38	0.89	0.98	0.98	0.62	1
	S₁	0.77	0.45	0.30	0.52	0.47	0.19	0.77	0.45	0.52	0.57	0.81	0.84	0.56	2
	S₂	0.35	0.35	0.35	0.35	0.35	0.35	0.35	0.35	0.35	0.35	0.35	0.35	0.35	3
	S₃	0.07	0.03	0.13	0.13	0.08	0.22	0.67	0.74	0.87	0.07	0.28	0.29	0.30	4
	S₄	0.05	0.12	0.14	0.06	0.12	0.93	0.46	0.90	0.35	0.17	0.06	0.13	0.29	5

To simulate the growth and physiological responses of Cyperus esculentus seedlings to salt stress in sandy soil

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