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Journal of Integrative Agriculture  2019, Vol. 18 Issue (7): 1571-1578    DOI: 10.1016/S2095-3119(18)62026-X
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Effect of mechanical threshing on damage and vigor of maize seed threshed at different moisture contents
GU Ri-liang, HUANG Ran, JIA Guang-yao, YUAN Zhi-peng, REN Li-sha, LI Li, WANG Jian-hua
Seed Science and Technology Research Center, College of Agronomy and Biotechnology, China Agricultural University/Beijing Key Laboratory of Crop Genetics and Breeding/Beijing Innovation Research Center on the Whole Process of Crop Seeds, Ministry of Agriculture, Beijing 100193, P.R.China
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Mechanical threshing used when preparing maize seeds for planting subjects seed to damage and reduces seed quality.  The purpose of this study was to assess the effect of mechanical threshing on the quality of maize seed threshed at different moisture contents (MCs).  Seeds of dent maize JK968 and flint maize DD2 were threshed at 12, 15, 18, 21, and 24% MC.  The damage degree was determined by iodine staining, and seed vigor was assessed by standard germination (SG), cold test germination (CTG), accelerated aging germination (AAG), seedling emergence rate, and seedling root and shoot length.  The results showed that the damage percentage increased, and the seed vigor parameters decreased with increasing seed MC during threshing in both cultivars.  For obtaining high seed quality, indicated by at least 90, 85, and 80% of SG, AAG, and CTG, respectively, JK 968 and DD2 should be threshed at MC lower than 15 and 18%, respectively.  Furthermore, the damage mainly occurred in the apical part of seeds, irrespective of the threshing MC in both cultivars.  When the embryo was damaged, seedling emergence rates were significantly reduced with great influence on shoot length.  Damage to the endosperm resulted in little effect on seedling performance.  Flint maize DD2 was more tolerant to mechanical threshing than dent maize JK968.  These results provided technical reference for the production and processing of high vigor maize seeds.
Keywords:  dent maize        flint maize        germination        threshing        vigor  
Received: 23 February 2018   Online: 06 June 2018   Accepted:
Fund: We thank anonymous reviewers for improving this manuscript. This research was supported by the earmarked fund for China Agriculture Research System (CARS-02-10), the Special Fund for Agro-scientific Research in the Public Interest, China (201303002), and the National Natural Science Foundation of China (31771891).
Corresponding Authors:  Correspondence WANG Jian-hua, Tel/Fax: +86-10-62732263, E-mail:   
About author:  GU Ri-liang, E-mail:;

Cite this article: 

GU Ri-liang, HUANG Ran, JIA Guang-yao, YUAN Zhi-peng, REN Li-sha, LI Li, WANG Jian-hua. 2019. Effect of mechanical threshing on damage and vigor of maize seed threshed at different moisture contents. Journal of Integrative Agriculture, 18(7): 1571-1578.

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