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Cassava (Manihot esculenta Crantz), a vital tropical food crop, exhibits significant sensitivity to low temperature, which severely restricts its cultivation range. Lignin is a key stress-resistant component in cell walls, playing a crucial role in plant adaptation to low temperature stress. However, the function of cinnamyl alcohol dehydrogenase (CAD), a pivotal enzyme in lignin biosynthesis, during low-temperature stress responses remains unclear. This study analyzed physiological phenotypes, CAD enzyme activity and lignin accumulation in cassava under low temperature stress. CAD enzyme activity was significantly increased by 66.7% and lignin content was also increased by 14.8% at the low temperature of 10 ℃. Transcriptome profiling identified MeCAD2 as the key gene responsive to low temperature stress. Heterologous expression of MeCAD2 confirmed that its encoded MeCAD2 protein possessed CAD enzymatic activity. Virus-induced gene silencing (VIGS) of MeCAD2 in cassava resulted in a 18.9% reduction in CAD enzyme activity and a 12.3%–22.4% decrease in lignin content. Furthermore, under low temperature stress, MeCAD2-silenced plants exhibited exacerbated leaf damage, a 172.5% increase in malondialdehyde (MDA) accumulation, and intensified reactive oxygen species (ROS) staining. The results indicate that MeCAD2 enhances cassava low-temperature tolerance by regulating lignin deposition. This study elucidated the critical role of MeCAD2 in cassava’s response to low-temperature stress, providing a novel candidate gene for molecular breeding.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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