硝酸镧浸种对藜麦种子萌发及盐胁迫下幼苗生长的影响

doi:10.3864/j.issn.0578-1752.2019.24.004

Abstract

Abstract:

【Objective】 With the formation of soil salinization, not only causes the resource-wasting, but also restricts the agricultural production. Quinoa has salt-tolerant properties, It can alleviate salt stress. China is the country with the most rare earth content. There is a study that lanthanum may alleviate the effects of salt stress on plants. In this study, quinoa was treated with salt stress, which seed had been soaked with lanthanum nitrate before. The effects of soaking seeds with lanthanum nitrate on seed germination and seedling growth of quinoa under salt stress were examined to find a way to improve salt resistance of the species. 【Method】 In this study, quinoa was used as the research material and greenhouse potted planting method was adopted in order to study the effects of different lanthanum nitrate leaching species (25, 50, 100 mg·L ^-1) on seed germination and seedling growth under different salt stresses (100, 200, 300 mmol·L ^-1 sodium chloride solution). 【Result】(1) When lanthanum nitrate was 50 mg·L ^-1, the effect of quinoa seeds were the optimal, the germination percentage, germination potential, and germination index of quinoa seeds were the highest, and there were significant differences compared with other concentrations. (2) At the same socking concentration, plant height and root length of seedlings decreased with the increase of salt concentrations within 300 mmol·L ^-1 NaCl, while peroxidase (POD), superoxide dismutase (SOD), malondialdehyde (MDA), soluble sugar, proline and other physiological and biochemical indexes increased with the increase of salt concentrations. (3) At the same salt concentration, plant height, root length and other growth indicators of quinoa seedlings showed the tendency of first increasing and then decreasing with the increase of soaking concentrations, as well as POD, SOD, soluble sugar, soluble protein, proline and other physiological and biochemical indexes. For MDA, the trends were reversed. (4) Quinoa seedlings survived and grown in the NaCl solutions less than 300 mmol·L ^-1, but optimal concentration was 300 mmol·L ^-1. At the same time 300 mmol·L ^-1 salt concentration, the growth index were the best when lanthanum nitrate was 50 mg·L ^-1.【Conclusion】 Under salt stress, quinoa seeds socked in low concentration solution of lanthanum nitrate could promote the seed germination and the shoot growth, strengthen the antioxidant enzyme activities of seedlings, and improve the content of the osmotic adjustment material, resulting in increasing resistance to salt stress. However, seedling growth was inhabited by high concentration solution of lanthanum nitrate. This study suggested that the resistance of quinoa to salt stress was enhanced by adding adequate lanthanum nitrate.

Key words: quinoa, seed germination, seedling, lanthanum nitrate, salt stress

ChunHua PANG,Yuan ZHANG,YaNi LI. Effects of Soaking Seeds with Lanthanum Nitrate on Seed Germination and Seedling Growth of Quinoa Under Salt Stress[J].Scientia Agricultura Sinica, 2019, 52(24): 4484-4492.

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References 34

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处理Treatment	发芽率Germination energy (%)	发芽势Germination rate (%)	发芽指数Germination index
T0	0.84±0.043c	0.825±0.042b	34.708±2.133b
T1	0.898±0.036ab	0.883±0.036a	40.833±1.072a
T2	0.908±0.028a	0.888±0.028a	39.979±1.855a
T3	0.86±0.043bc	0.845±0.037b	35.646±1.242b

硝酸镧处理 Lanthanum treatment	氯化钠浓度 NaCl treatment (mmol·L^-1)	株高 Plant height (cm)	根长 Root length (cm)	苗长 Seedling length (cm)
T0	N0	19.72±0.31Ab	6.88±0.24Ca	26.6±0.53Ab
	N1	17.62±0.20Bb	8.64±0.30Ba	26.26±0.48Ab
	N2	14.36±0.30Cb	10.42±0.38Aa	24.78±0.66Ab
	N3	11.1±0.22Db	6.26±0.21Ca	17.36±0.22Bb
T1	N0	21.48±0.30Aa	5.74±0.27Cb	27.22±0.38Ab
	N1	19.94±0.36Ba	7.02±0.20Bb	26.96±0.46Ab
	N2	18.14±0.21Ca	9.34±0.20Ab	27.48±0.20Ab
	N3	14.86±0.31Da	5.78±0.17Cb	20.64±0.42Bb
T2	N0	22.94±0.31Aa	7.6±0.26Ca	30.54±0.43Aa
	N1	21.22±0.38Ba	8.9±0.21Ba	30.12±0.42Aa
	N2	19.34±0.23Ca	10.98±0.38Aa	30.32±0.50Aa
	N3	17.68±0.29Da	6.94±0.31Ca	24.62±0.42Ba
T3	N0	18.74±0.24Ab	4.86±0.30Cc	23.6±0.43Ac
	N1	14.7±0.17Bb	6.56±0.22Bc	21.26±0.35Ac
	N2	11.44±0.25Cb	7.64±0.30Ac	19.08±0.45Ac
	N3	10.68±0.10Db	4.64±0.24Cc	15.32±0.30Bc

Effects of Soaking Seeds with Lanthanum Nitrate on Seed Germination and Seedling Growth of Quinoa Under Salt Stress

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