The Potential Function of SiLOX4 on Millet Discoloration during Storage in Foxtail Millet

Qi Ma, Junjie Wang, Lu Cheng, Yaqiong Li, Qianxiang Zhang, Hongying Li, Yuanhuai Han, Xiaoxi Zhen () and Bin Zhang ()
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Qi Ma: College of Agriculture, Shanxi Agricultural University, Jinzhong 030801, China
Junjie Wang: College of Agriculture, Shanxi Agricultural University, Jinzhong 030801, China
Lu Cheng: College of Agriculture, Shanxi Agricultural University, Jinzhong 030801, China
Yaqiong Li: College of Agriculture, Shanxi Agricultural University, Jinzhong 030801, China
Qianxiang Zhang: College of Agriculture, Shanxi Agricultural University, Jinzhong 030801, China
Hongying Li: College of Agriculture, Shanxi Agricultural University, Jinzhong 030801, China
Yuanhuai Han: College of Agriculture, Shanxi Agricultural University, Jinzhong 030801, China
Xiaoxi Zhen: Shanxi Key Laboratory of Minor Crop Germplasm Innovation and Molecular Breeding, Shanxi Agricultural University, Taiyuan 030031, China
Bin Zhang: College of Agriculture, Shanxi Agricultural University, Jinzhong 030801, China

Agriculture, 2022, vol. 12, issue 8, 1-12

Abstract: Millet color is an important index for consumers to assess foxtail millet quality. The yellow color of millet is mainly because of the accumulation of carotenoids, which are essential for human nutrition. However, the discoloration of millet during storage due to carotenoid degradation seriously reduces the nutritional and commercial value of millet products. The essential quality traits of millet discoloration during storage were analyzed using two foxtail millet varieties, namely 9806-1 and Baomihunzi. We observed that the millet discoloration was caused by carotenoid degradation during storage, and different genotypes exhibited different discoloration rates. The carotenoid reduction rate in 9806-1 (32.2%) was higher than that in Baomihunzi (10.5%). The positive correlation between carotenoid reduction and the expression of SiLOX protein indicated that SiLOX from foxtail millet played a major role in carotenoid reduction during storage. The expression profiles of the SiLOX gene family were analyzed at different grain maturing stages, from S1 to S3, in these two varieties to determine the key SiLOX genes responsive to millet discoloration in foxtail millet. The consecutively low expression of SiLOX2 , SiLOX3 , and SiLOX4 contributed to the low level of SiLOX protein in Baomihunzi. Furthermore, the undetectable expression of SiLOX4 in the later stage of maturation in Baomihunzi was associated with low discoloration, indicating that SiLOX4 might be a key gene in regulating the discoloration of millet. This study provided critical information on the mechanism of carotenoid degradation during millet storage and laid the foundation for further understanding of carotenoid metabolism in foxtail millet.

Keywords: foxtail millet; lipoxygenase; carotenoid; discoloration (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2022
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