Effect of UV-B radiation and a supplement of CaCl2 on carotenoid biosynthesis in germinated corn kernels
2019
He, Weiwei | Wang, Yuxi | Dai, Zhuqing | Liu, Chunquan | Xiao, Yadong | Wei, Qiuyu | Song, Jiangfeng | Li, Dajing
This study investigated effects of UV-B radiation and CaCl₂ on the enhancement of carotenoid content in germinated corn kernels. UV-B radiation and CaCl₂ treatments were effective for promoting both carotenoid content and antioxidant activity. Furthermore, the carotenoid content was greater when under the combined treatments of UV-B radiation and CaCl₂. Activities of superoxide dismutase and peroxidase were enhanced but malondialdehyde content was weakened by UV-B radiation plus CaCl₂ compared to the UV-B radiation only. The mRNA expression of PSY, PDS, ZDS, LCYB, LCYE, BCH1, CYP97C genes involved in the carotenoid biosynthesis pathway showed different patterns in UV-B radiation and CaCl₂ treatments. This reveals that the UV-B radiation can increase carotenoid content and antioxidant enzyme activity. Moreover, CaCl₂ can further improve carotenoid content and reduce photooxidative damage caused by UV-B radiation.
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