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Acta Agronomica Sinica ›› 2022, Vol. 48 ›› Issue (5): 1210-1221.doi: 10.3724/SP.J.1006.2022.11040

• TILLAGE & CULTIVATION·PHYSIOLOGY & BIOCHEMISTRY • Previous Articles     Next Articles

Effects of soaking seeds with MT and EBR on germination and seedling growth in buckwheat under salt stress

LEI Xin-Hui(), WAN Chen-Xi, TAO Jin-Cai, LENG Jia-Jun, WU Yi-Xin, WANG Jia-Le, WANG Peng-Ke, YANG Qing-Hua, FENG Bai-Li, GAO Jin-Feng*()   

  1. College of Agronomy, Northwest A&F University / State Key Laboratory of Crop Stress Biology for Arid Areas, Yangling 712100, Shaanxi, China
  • Received:2021-04-07 Accepted:2021-07-12 Online:2022-05-12 Published:2021-07-26
  • Contact: GAO Jin-Feng E-mail:1623780347@qq.com;gaojf7604@126.com
  • Supported by:
    National Key Research and Development Program of China(2020YFD1000805-03);Scientific and Technological Innovation Project of Northwest A&F University(TGZX2019-05);Technical System of Minor Cereals Industry in Shaanxi Province(K3330216003)

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Abstract:

Soil salinization is an important limiting factor affecting seed germination, emergence, and growth of crop seeds. It is of great significance to explore the relieving effect of exogenous hormones on buckwheat seed germination and seedling growth under salt stress. This experiment was conducted to study the effects of melatonin (MT) and 2,4-epbrassinolide (EBR) on seed germination, seedling growth, antioxidant enzyme activity, and osmotic regulation substances of buckwheat varieties Xinong 9976 under different salt concentration stress using petri dish germination and pot germination. The results showed that salt stress increased the malondialdehyde (MDA) content, soluble sugar content, and antioxidant enzyme (SOD, POD, CAT) activities of buckwheat seeds and seedling leaves, decreased the germination potential, germination rate, and seedling rate of buckwheat seeds, and significantly decreased the germ length, radicle length, and seedling height of buckwheat seeds. MT and EBR soaking buckwheat seeds could effectively alleviate the harm of salt stress. Compared with the control, the germination potential, germination rate, and seedling formation rate of buckwheat seeds were increased by 14.9%-33.3%, 11.5%-27.3%, and 20.0%-46.2%, respectively. It significantly increased the radicle length, embryo length, embryo fresh weight, dry weight, seedling height, seedling fresh weight, and dry weight of buckwheat seeds, and significantly increased the soluble sugar content and the activities of SOD, POD, and CAT in buckwheat seeds and seedling leaves, and decreased MDA content. In conclusion, MT and EBR soaking can promote the germination and seedling growth of buckwheat seeds under salt stress, and improve the salt resistance of buckwheat by improving the protective enzyme activity of buckwheat seeds, reducing the accumulation of reactive oxygen species, and increasing the content of osmotic regulation substances.

Key words: buckwheat, salt stress, melatonin, 2,4-epibrassinolide, seed germination, seedling growth

Fig. 1

Effects of soaking seeds with melatonin (MT) and 2,4-epibrassinolide (EBR) on germination energy and germination rate in buckwheat seeds under salt stress Bars superscripted by different lowercase letters are significantly different at the 0.05 probability level."

Fig. 2

Effects of soaking seeds with melatonin (MT) and 2,4-epibrassinolide (EBR) on bud length and root length in buckwheat seeds under salt stress Bars superscripted by different lowercase letters are significantly different at the 0.05 probability level."

Fig. 3

Effects of soaking seeds with melatonin (MT) and 2,4-epibrassinolide (EBR) on bud length and root length in buckwheat seeds under salt stress 0 mmol L-1: cultured in clear water; 100 mmol L-1: the culture medium is 100 mmol L-1 salt solution; 150 mmol L-1: the culture medium is 150 mmol L-1 salt solution; 200 mmol L-1: the culture medium is 200 mmol L-1 salt solution; CK: soaking seeds in clear water; MT: 200 μmol L-1 MT seed soaking treatment; EBR: 0.1 μmol L-1 EBR seed soaking treatment."

Table 1

Effects of soaking seeds with melatonin (MT) and 2,4-Epibrassinolide (EBR) on dry weight and fresh weight in buckwheat seed buds under salt stress"

指标
Indicator		 处理
Treatment		 盐分浓度 NaCl concentration
0 mmol L-1 100 mmol L-1 150 mmol L-1 200 mmol L-1
芽鲜重
Fresh weight of bud (mg)		 CK 89.50±7.50 b 44.98±1.05 c 22.67±0.50 c 5.13±0.13 b
MT 101.00±3.40 a 54.00±1.43 b 25.60±0.57 b 6.57±0.28 a
EBR 95.58±4.06 ab 61.50±1.98 a 31.80±0.80 a 6.93±0.27 a
芽干重
Dry weight of bud (mg)		 CK 6.25±0.50 a 2.82±0.16 b 1.93±0.14 b 0.48±0.03 b
MT 7.08±0.28 a 3.87±0.19 a 2.57±0.17 a 0.56±0.06 ab
EBR 7.00±0.50 a 4.02±0.30 a 2.63±0.16 a 0.61±0.06 a

Fig. 4

Effects of soaking seeds with melatonin (MT) and 2,4-epibrassinolide (EBR) on antioxidant enzyme activity in buckwheat seeds after germination under salt stress Bars superscripted by different lowercase letters are significantly different at the 0.05 probability level."

Fig. 5

Effects of soaking seeds with melatonin (MT) and 2,4-epibrassinolide (EBR) on osmotic adjustment substances in buckwheat seeds after germination under salt stress Bars superscripted by different lowercase letters are significantly different at the 0.05 probability level."

Table 2

Effects of soaking seeds with melatonin (MT) and 2,4-epibrassinolide (EBR) on seedling emergence in buckwheat under salt stress"

指标
Indicator		 处理
Treatment		 盐分浓度 NaCl concentration
0 mmol L-1 100 mmol L-1 150 mmol L-1 200 mmol L-1
出芽时间
Germination time (d)		 CK 8-9 9-10 11 14
MT 8-9 8-9 10 11-13
EBR 8 8 9 11-14
子叶展开时间
Cotyledon unfolding time (d)		 CK 8-11 9-12 11-15 14-19
MT 8-11 8-11 10-14 11-18
EBR 8-10 8-11 10-14 11-19

Fig. 6

Effects of soaking seeds with melatonin (MT) and 2,4-epibrassinolide (EBR) on the survival rate in buckwheat seeds under salt stress Bars superscripted by different lowercase letters are significantly different at the 0.05 probability level."

Fig. 7

Effects of soaking seeds with melatonin (MT) and 2,4-epibrassinolide (EBR) on plant height in buckwheat seedlings under salt stress Bars superscripted by different lowercase letters are significantly different at the 0.05 probability level."

Fig. 8

Effects of soaking seeds with melatonin (MT) and 2,4-epibrassinolide (EBR) on the growth of buckwheat seedlings under salt stress on the 18th day"

Table 3

Effects of soaking seeds with melatonin (MT) and 2,4-epibrassinolide (EBR) on dry weight and fresh weight in buckwheat seedlings under salt stress"

指标
Indicator		 处理
Treatment		 盐分浓度 NaCl concentration
0 mmol L-1 100 mmol L-1 150 mmol L-1 200 mmol L-1
幼苗鲜重
Fresh weightof seedlings (mg)		 CK 408.5±19.3 a 354.8±10.5 b 232.9±8.1 b 113.6±11.3 b
MT 409.9±10.3 a 391.2±2.0 a 267.1±10.4 a 142.0±7.8 a
EBR 416.6±12.7 a 380.8±15.6 ab 281.1±8.5 a 154.5±8.4 a
幼苗干重
Dry weight of seedlings (mg)		 CK 16.8±1.6 a 14.2±0.6 b 11.3±1.5 b 8.1±1.0 b
MT 17.3±1.2 a 16.6±0.3 a 12.7±0.6 ab 10.0±0.6 ab
EBR 18.7±1.3 a 15.6±1.2 ab 13.6±0.6 a 10.9±1.3 a

Fig. 9

Effects of soaking seeds with melatonin (MT) and 2,4-epibrassinolide (EBR) on antioxidant enzyme activity in buckwheat seedlings leaves Bars superscripted by different lowercase letters are significantly different at the 0.05 probability level."

Fig. 10

Effects of soaking seeds with melatonin (MT) and 2,4-epibrassinolide (EBR) on osmotic adjustment substances in buckwheat seedling leaves Bars superscripted by different lowercase letters are significantly different at the 0.05 probability level."

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