You can request new variables or an update to an existing one here: http://trait-requests.planteome.org/.
Citation
Shrestha, R., Pietragalla, J., Valette, L., Reynolds, M., Singh, P., Pena, J., Autrique, E., González, H., Guzmán, C., Winge, L., Waring, D., Molero, G., Pommier, C., Letellier, T., Legouis, J., Laporte, M. A., Arnaud, E., Cooper, L., & Payne, T. (2023). Planteome/CO_321-wheat-traits: August 2023 Release- For Planteome Release V5 (v2023-08-16) [Data set]. Zenodo. https://doi.org/10.5281/zenodo.8253720