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作物学报 ›› 2022, Vol. 48 ›› Issue (5): 1210-1221.doi: 10.3724/SP.J.1006.2022.11040

• 耕作栽培·生理生化 • 上一篇    下一篇

褪黑素与2,4-表油菜素内酯浸种对盐胁迫下荞麦发芽与幼苗生长的促进效应

雷新慧(), 万晨茜, 陶金才, 冷佳俊, 吴怡欣, 王家乐, 王鹏科, 杨清华, 冯佰利, 高金锋*()   

  1. 西北农林科技大学农学院 / 旱区作物逆境生理学国家重点实验室, 陕西杨凌 712100
  • 收稿日期:2021-04-07 接受日期:2021-07-12 出版日期:2022-05-12 网络出版日期:2021-07-26
  • 通讯作者: 高金锋
  • 作者简介:E-mail: 1623780347@qq.com
  • 基金资助:
    国家重点研发计划项目(2020YFD1000805-03);西北农林科技大学科技创新项目(TGZX2019-05);陕西省小杂粮产业技术体系资助(K3330216003)

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 Published:2022-05-12 Published online:2021-07-26
  • Contact: GAO Jin-Feng
  • 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)

摘要:

土壤盐渍化是影响农作物种子萌发出苗以及生长发育的重要限制因素, 探究外源激素对盐胁迫条件下荞麦种子萌发与幼苗生长的缓解作用具有重要意义。本试验以荞麦品种西农9976为材料, 采用培养皿萌发和盆栽发芽2种方法, 研究褪黑素(MT)与2,4-表油菜素内酯(EBR)浸种对不同盐浓度胁迫下荞麦种子萌发、幼苗生长、抗氧化酶活性、渗透调节物质的影响。结果表明, 盐胁迫增加了荞麦种子和幼苗叶片丙二醛(MDA)含量、可溶性糖含量和抗氧化酶(SOD、POD、CAT)活性, 降低了荞麦种子发芽势、发芽率和成苗率, 使荞麦种子胚芽长度、胚根长度和幼苗高度显著下降。MT、EBR浸种荞麦种子可有效缓解盐胁迫危害, 使荞麦种子发芽势、发芽率和成苗率较对照分别增加14.9%~33.3%、11.5%~27.3%和20.0%~46.2%, 显著提高荞麦种子胚根长度、胚芽长度、胚芽鲜重和干重、幼苗高度、幼苗鲜重和干重, 并显著增加荞麦种子和幼苗叶片中可溶性糖含量和SOD、POD、CAT活性, 降低MDA含量。综上所述, MT和EBR浸种均能通过提高荞麦种子保护酶活性、减少活性氧积累、增加渗透调节物质含量, 促进盐胁迫条件下荞麦种子发芽及幼苗生长, 提高荞麦的抗盐性。

关键词: 荞麦, 盐胁迫, 褪黑素, 2,4-表油菜素内酯, 种子萌发, 幼苗生长

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

图1

褪黑素(MT)和2,4-表油菜素内酯(EBR)浸种对盐胁迫下荞麦种子发芽势和发芽率的影响 图中不同小写字母表示处理间差异达0.05显著水平。"

图2

褪黑素(MT)和2,4-表油菜素内酯(EBR)浸种对盐胁迫下荞麦种子芽长和根长的影响 图中不同小写字母表示处理间差异达0.05显著水平。"

图3

褪黑素(MT)和2,4-表油菜素内酯(EBR)浸种对盐胁迫下荞麦种子芽长和根长的影响 0 mmol L-1: 清水培养; 100 mmol L-1: 培养液为100 mmol L-1盐溶液; 150 mmol L-1: 培养液为150 mmol L-1盐溶液; 200 mmol L-1: 培养液为200 mmol L-1盐溶液; CK:清水浸种处理; MT: 200 μmol L-1 MT浸种处理; EBR: 0.1 μmol L-1 EBR浸种处理。"

表1

褪黑素(MT)和2,4-表油菜素内酯(EBR)浸种对盐胁迫下荞麦种子芽干重和鲜重的影响"

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

图4

褪黑素(MT)和2,4-表油菜素内酯(EBR)浸种对盐胁迫下荞麦种子发芽后抗氧化酶活性的影响 图中不同小写字母表示处理间差异达0.05显著水平。"

图5

褪黑素(MT)和2,4-表油菜素内酯(EBR)浸种对盐胁迫下荞麦种子发芽后渗透调节物质的影响 图中不同小写字母表示处理间差异达0.05显著水平。"

表2

褪黑素(MT)和2,4-表油菜素内酯(EBR)浸种对盐胁迫下荞麦出苗的影响"

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

图6

褪黑素(MT)和2,4-表油菜素内酯(EBR)浸种对盐胁迫下荞麦种子成苗率的影响 图中不同小写字母表示处理间差异达0.05显著水平。"

图7

褪黑素(MT)和2,4-表油菜素内酯(EBR)浸种对盐胁迫下荞麦幼苗株高的影响 图中不同小写字母表示处理间差异达0.05显著水平。"

图8

褪黑素(MT)和2,4-表油菜素内酯(EBR)浸种对盐胁迫下荞麦幼苗第18天长势情况的影响"

表3

褪黑素(MT)和2,4-表油菜素内酯(EBR)浸种对盐胁迫下荞麦幼苗干重和鲜重的影响"

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

图9

褪黑素(MT)和2,4-表油菜素内酯(EBR)浸种对盐胁迫下荞麦幼苗叶片抗氧化酶活性的影响 图中不同小写字母表示处理间差异达0.05显著水平。"

图10

褪黑素(MT)和2,4-表油菜素内酯(EBR)浸种对盐胁迫下荞麦幼苗叶片渗透调节物质的影响 图中不同小写字母表示处理间差异达0.05显著水平。"

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