液泡
胞浆
亚细胞定位
镉
活性氧
细胞生物学
生物
生物化学
化学
基因
细胞质
酶
有机化学
作者
Hongfang Jia,Zhuoran Yin,Dongdong Xuan,Wenli Lian,Dan Han,Zitong Zhu,Chenyi Li,Chang Li,Zhaopeng Song
标识
DOI:10.1016/j.jhazmat.2022.128701
摘要
Cadmium (Cd) is a harmful element that affects plant growth and development. Genetic improvements could be applied for enhancing Cd tolerance and accumulation in plants. Here, a novel Cd stress-induced gene, NtNRAMP3, was identified in tobacco. We constructed two NtNRAMP3-knockout (KO) tobacco lines using the CRISPR/Cas9 system, which enhanced Cd tolerance and Cd accumulation in tobacco leaves compared with those in the wildtype (WT). Subcellular localization analysis suggested that NtNRAMP3 is a tonoplast protein and GUS (β-glucuronidase) histochemical analysis showed that NtNRAMP3 is highly expressed in the conductive tissue of leaves. NtNRAMP3-KO tobacco showed reduced Cd translation from vacuole to cytosol in leaves compared with the WT, and its vacuolar Cd concentration was significantly higher (20.78–22.81%) than that in the WT; in contrast, Cd concentration in the cytosol was reduced by 13.72–20.15%, preventing chlorophyll degradation and reducing reactive oxygen species accumulation in the leaves. Our findings demonstrate that NtNRAMP3 is involved in regulating Cd subcellular distribution (controlling Cd transport from vacuoles to the cytosol) and affects Cd tolerance and its accumulation in tobacco. This provides a key candidate gene to improve the phytoremediation efficiency of plants via genetic engineering.
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