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草业学报 ›› 2021, Vol. 30 ›› Issue (12): 152-160.DOI: 10.11686/cyxb2020469

• 研究论文 • 上一篇    

含水量和劣变时间对高丹草种子活力及幼苗生长的影响

闫慧芳1(), 孙娟1,2()   

  1. 1.青岛农业大学草业学院,草地农牧业研究中心,山东 青岛 266109
    2.东营青农大盐碱地高效农业技术产业研究院,山东 东营 257300
  • 收稿日期:2020-10-13 修回日期:2020-12-14 出版日期:2021-11-11 发布日期:2021-11-11
  • 通讯作者: 孙娟
  • 作者简介:Corresponding author. E-mail: sunjuan@qau.edu.cn
    闫慧芳(1987-),女,山东德州人,讲师,博士。E-mail: yanhuifang@qau.edu.cn
  • 基金资助:
    国家牧草产业技术体系(CARS-34);山东省一流学科-草学(1619002);青岛农业大学高层次人才科研基金(663-1120006)

Effect of seed moisture content and deterioration time on seed vigor and seedling growth of Sorghum bicolor×Sorghum sudanense

Hui-fang YAN1(), Juan SUN1,2()   

  1. 1.Grassland Agri-Husbandry Research Center,College of Grassland Science,Qingdao Agricultural University,Qingdao 266109,China
    2.Saline-alkali Land High Efficiency Agricultural Technology Industry Research Institute,Dongying-Qingdao Agricultural University,Dongying 257300,China
  • Received:2020-10-13 Revised:2020-12-14 Online:2021-11-11 Published:2021-11-11
  • Contact: Juan SUN

摘要:

以高丹草种子为材料,研究不同含水量(MC,10%、12%和16%)和劣变时间(0、4、8、12、16、20、24和28 d)处理后种子活力指标(发芽率GP、发芽指数GI、活力指数VI)和幼苗生长指标(苗长SL、苗重SW、根长RL、根重RW、幼苗活力指数SVI)变化,探究含水量和劣变时间对种子活力及幼苗生长状况的影响。结果表明,随含水量由10%升高至16%,劣变4~8 d时,种子GP、GI、VI及幼苗SW、SVI均显著降低;劣变16~28 d时,尽管种子活力指标及幼苗生长指标在12%和16%MC间差异不显著,但均显著低于10%MC的相应指标。随劣变时间延长,种子GP、GI和VI降低,幼苗SL、SW、RL、RW和SVI也降低。16%MC种子的活力及幼苗生长指标在劣变8 d后已几乎降为0,而10%MC种子的GP、GI和VI在劣变28 d时仍分别保持原有水平的10.0%、14.1%和1.5%,且10%、12%和16%MC种子抗劣变时间分别为28、16和8 d,这表明含水量越高,种子活力越容易丧失,抗劣变能力也越差。此外,种子含水量、劣变时间及两者交互作用对种子活力和幼苗生长均具有极显著影响。劣变8 d处理可以较好地评价不同含水量高丹草种子的活力水平。

关键词: 高丹草, 含水量, 劣变时间, 种子活力, 幼苗生长

Abstract:

This study was conducted to explore the effects of different seed moisture contents (MC; 10%, 12% and 16%) and deterioration time (exposure to 45 ℃ condition for 0, 4, 8, 12, 16, 20, 24 and 28 d) on seed vigor and seedling growth of Sorghum bicolor×Sorghum sudanense, including changes of germination percentage (GP), germination index (GI), vigor index (VI), shoot length (SL), shoot weight (SW), root length (RL), root weight (RW) and seedling vigor index (SVI). It was found that, with MC increasing from 10% to 16%, GP, GI, VI, SW and SVI of S. bicolor×S. sudanense decreased significantly after deterioration for 4-8 d. After deterioration for 16-28 d, indexes of seed vigor and seedling growth ranked 10% MC>12% MC=16% MC. Meanwhile, with extended deterioration time, GP, GI and VI of seeds decreased, and SL, SW, RL, RW and SVI of seedlings also decreased. For 16% MC seeds, after deterioration for 8 d, seed vigor and seedling growth indicators had dropped almost to zero, while GP, GI and VI of 10% MC seeds still remained, respectively, 10.0%, 14.1% and 1.5% of their original levels after deterioration for 28 d. Moreover, the duration of resistance to deterioration was 28, 16 and 8 d, respectively, for seeds at 10%, 12% and 16% MC. These results indicate that the higher the moisture content, the more readily seed vigor was list and the more severe was the loss of resistance to deterioration. In addition, seed moisture content, deterioration time and their interactions resulted in highly significant differences in GP, GI, VI of seeds and SL, SW, RL, RW and SVI of seedlings. Based on these results, a deterioration duration of 8 d could be used with good effect to evaluate seed vigor level of S. bicolor×S. sudanense seeds with different moisture contents.

Key words: Sorghum bicolor×Sorghum sudanense, moisture content, deterioration time, seed vigor, seedling growth