Carbon monoxide (CO) is a kind of colorless, odorless, non-irritating gas. After entering the body, carbon monoxide will combine with hemoglobin in the blood, so that hemoglobin cannot combine with oxygen, which causes the body tissue to lack oxygen, resulting in suffocation death. Therefore, people often think of carbon monoxide as a "silent killer" and talk about it. But in recent years, more and more research evidence shows that this killer is not too "cold", and very low concentrations of carbon monoxide also have many unexpected physiological functions: for example, carbon monoxide can be used as a signal molecule to regulate neurotransmitters and neuropeptides. Release and regulate memory behavior and odor response; carbon monoxide's vasodilator and cardioprotective effects have also been confirmed; carbon monoxide also plays an important role in the body's immune, reproduction, digestion, liver and kidney systems; in plant physiology, carbon monoxide treatment can alleviate Salt stress causes peroxidative damage to plants. Various signs indicate that the physiological function of CO is actually multi-faceted, and people's understanding of carbon monoxide is also changing.
The seeds in nature can be roughly divided into two types: normal seeds (orthodox seeds) and recalcitrant seeds (recalcitrant seeds). Normal seeds can generally tolerate low temperature and long-term low-temperature storage after drying treatment, but recalcitrant seeds generally cannot tolerate low-temperature or drying treatment, so recalcitrant seeds generally cannot be stored at low temperatures. This characteristic may be related to low-temperature-induced activity Oxygen free radicals (reactive oxygen species) are associated with reactive nitrogen species damage. Effectively improving the tolerance of recalcitrant seeds to low temperature stress is a difficult problem of low temperature preservation of current germplasm.
The Hu Xiangyang research group of the Kunming Institute of Botany, Chinese Academy of Sciences, in collaboration with Li Deba and Yang Yongping research groups, used recalcitrant wood shea seeds (Baccaurea ramiflora) as materials to improve the low temperature stress of wood shea seeds by low concentration carbon monoxide treatment Tolerance. The results showed that: low temperature treatment induced the accumulation of carbon monoxide in the apical end of Xanthoxylum chinense, and further induced the production of nitric oxide (NO), another small molecule compound; exogenous carbon monoxide treatment obviously induced the accumulation of nitric oxide, nitric oxide On the one hand, by activating the antioxidant system to reduce the damage of low temperature-induced ROS to seed vigor; on the other hand, nitric oxide also activates the activity of S-nitrosoglutathione reductase, thereby reducing the low temperature The damage induced by RNS shows that carbon monoxide can enhance the tolerance of recalcitrant seeds to low temperature stress through a two-pronged approach.
The above results have been published online by Free Radical Biology & Medicine, a journal in the field of free radical biology and medicine. The research was supported by the "100 Persons Program" of the Chinese Academy of Sciences and the National Natural Science Foundation of China.
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