期刊
FRONTIERS IN PLANT SCIENCE
卷 14, 期 -, 页码 -出版社
FRONTIERS MEDIA SA
DOI: 10.3389/fpls.2023.1144265
关键词
cadmium stress; sorghum bicolor; physiological; transcriptome; metabolome; flavonoid biosynthesis
Cadmium pollution poses a serious threat to plant growth and human health, but the mechanisms underlying the response in Sorghum plants are still unknown. This study exposed one-week-old Sorghum seedlings to different concentrations of CdCl2 and found that Cd stress inhibited plant height, lateral root density, and biomass production. Further analysis revealed that the flavonoid biosynthesis pathway plays a critical role in regulating Cd stress responses in Sorghum. These findings provide new insights into the Cd response mechanism in Sorghum.
Cadmium (Cd) pollution is a serious threat to plant growth and human health. Although the mechanisms controlling the Cd response have been elucidated in other species, they remain unknown in Sorghum (Sorghum bicolor (L.) Moench), an important C-4 cereal crop. Here, one-week-old sorghum seedlings were exposed to different concentrations (0, 10, 20, 50, 100, and 150 mu M) of CdCl2 and the effects of these different concentrations on morphological responses were evaluated. Cd stress significantly decreased the activities of the enzymes peroxidase (POD), superoxide dismutase (SOD), glutathione S-transferase (GST) and catalase (CAT), and increased malondialdehyde (MDA) levels, leading to inhibition of plant height, decreases in lateral root density and plant biomass production. Based on these results, 10 mu M Cd concentration was chosen for further transcription and metabolic analyses. A total of 2683 genes and 160 metabolites were found to have significant differential abundances between the control and Cd-treated groups. Multi-omics integrative analysis revealed that the flavonoid biosynthesis pathway plays a critical role in regulating Cd stress responses in sorghum. These results provide new insights into the mechanism underlying the response of sorghum to Cd.
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