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Acta Prataculturae Sinica ›› 2021, Vol. 30 ›› Issue (12): 152-160.DOI: 10.11686/cyxb2020469

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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

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