Effect of Ultraviolet B Radiation on the Biosynthesis of Carotenoids in Foxtail Millet Grains

Yiqiong Huo, Xiangdong Pang, Huixia Feng, Ruili Hao, Ruijie Zhang, Yushen Wang, Haigang Wang, Bin Zhang and Yuanhuai Han ()
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Yiqiong Huo: College of Agriculture, Shanxi Agricultural University, Jinzhong 030801, China
Xiangdong Pang: College of Agriculture, Shanxi Agricultural University, Jinzhong 030801, China
Huixia Feng: College of Agriculture, Shanxi Agricultural University, Jinzhong 030801, China
Ruili Hao: College of Agriculture, Shanxi Agricultural University, Jinzhong 030801, China
Ruijie Zhang: College of Agriculture, Shanxi Agricultural University, Jinzhong 030801, China
Yushen Wang: College of Agriculture, Shanxi Agricultural University, Jinzhong 030801, China
Haigang Wang: Center for Agricultural Genetic Resources Research, Shanxi Agricultural University, Taiyuan 030031, China
Bin Zhang: College of Agriculture, Shanxi Agricultural University, Jinzhong 030801, China
Yuanhuai Han: College of Agriculture, Shanxi Agricultural University, Jinzhong 030801, China

Agriculture, 2024, vol. 14, issue 2, 1-16

Abstract: Foxtail millet is a vital nutritional cereal. The de-husked grain is usually yellow and mainly contains carotenoids, which directly reflects the millet quality. In this study, the impact of ultraviolet-B(UV-B) on millet color and carotenoid content was determined using two foxtail millet varieties, HuaJinZao (HJZ) and Qinhuang 2 (QH). The b * value at different stages of grain development and the content of carotenoids (primarily lutein and zeaxanthin) in foxtail millet grains decreased when the plants were exposed to low UV-B intensity. A total of 3113 and 96 differentially expressed genes were identified in HJZ and QH, respectively, and were found to be associated with the metabolism of tryptophan, starch, and sucrose as well as the biosynthesis of amino acids, which was relatively consistent with the functional annotation of differential metabolites. Furthermore, we evaluated the changes in the expression of seven and eight genes associated with carotenoid and starch metabolism, respectively, in the kernels of foxtail millet exposed to UV-B and found that appropriate UV-B intensity could promote the expression levels of genes involved in carotenoid synthesis and repress the expression of genes involved in carotenoid degradation. This study lays a theoretical foundation for cultivating new foxtail millet varieties with high carotenoid content.

Keywords: UV-B; carotenoids; foxtail millet; millet color (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: 2024
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