Center for Genomics and Biotechnology, Fujian Provincial Key Laboratory of Haixia Applied Plant Systems Biology, Key Laboratory of Sugarcane Biology and Genetic Breeding, National Engineering Research Center for Sugarcane, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
Guangxi Key Laboratory of Sugarcane Biology, Guangxi University, Nanning 530004, China.
Int J Mol Sci. 2022 Aug 26;23(17):9681. doi: 10.3390/ijms23179681.
Modern sugarcane cultivars were generated through interspecific crossing of the stress resistance and the high sugar content which was domesticated from . Magnesium deficiency (MGD) is particularly prominent in tropical and subtropical regions where sugarcane is grown, but the response mechanism to MGD in sugarcane remains unknown. Physiological and transcriptomic analysis of the three founding species under different magnesium (Mg) levels was performed. Our result showed that MGD decreased chlorophyll content and photosynthetic efficiency of three species but led to increased starch in leaves and lignin content in roots of and . We identified 12,129, 11,306 and 12,178 differentially expressed genes (DEGs) of , and , respectively. In , MGD affected signal transduction by up-regulating the expression of xylan biosynthesis process-related genes. responded to the MGD by regulating the expression of transcription and detoxification process-related genes. , avoids damage from MGD by regulating the expression of the signing transduction process and the transformation from growth and development to reproductive development. This novel repertoire of candidate genes related to MGD response in sugarcane will be helpful for engineering MGD tolerant varieties.
现代甘蔗品种是通过种间杂交选育出来的，具有抗逆性和高含糖量，这些特性是从野生甘蔗中驯化而来的。在甘蔗种植的热带和亚热带地区，镁缺乏症（MGD）尤为突出，但甘蔗对 MGD 的响应机制尚不清楚。对三个原始种在不同镁（Mg）水平下的生理和转录组进行了分析。结果表明，MGD 降低了三个种的叶绿素含量和光合作用效率，但导致叶片中淀粉和根中木质素含量增加。我们鉴定了 、 和 中的 12129、11306 和 12178 个差异表达基因（DEGs）。在 中，MGD 通过上调木聚糖生物合成过程相关基因的表达来影响信号转导。通过调节转录和解毒过程相关基因的表达来响应 MGD。通过调节信号转导过程和从生长发育到生殖发育的转化来避免 MGD 造成的损害。甘蔗中与 MGD 响应相关的这组新的候选基因将有助于工程耐 MGD 品种的选育。
