**5. Conclusions and Outlook**

The simultaneous operation and regulation of the different pathways involved in central carbon and nitrogen metabolism are highly complex. This special issue aims to provide a useful extension of the existing knowledge in the field and, hopefully, inspire new research to further develop this field including new strategies and projects. Such work would not only ultimately help to further increase our current understanding on how metabolism works and is regulated in different subcellular organelles, but will also contribute to the overall aim to breed better crops, showing high productivity in a changing environment.

**Author Contributions:** Writing—original draft preparation, S.T.; review and editing, S.A. All authors read and agreed to the published version of the manuscript.

**Funding:** This research received no external funding.

**Acknowledgments:** We gratefully acknowledge the excellent support from the *Plants* editorial office, especially received from Sylvia Guo. We also thank all researchers who contributed papers to the special issue.

**Conflicts of Interest:** The authors declare no conflict of interest.

#### **References**

