**5. Prospective**

Chl fluorescence techniques will continue to play a major role on HTPP. Among these, imaging-PAM techniques will play a pivotal role, although specific cases will require different technological solutions. Moreover, field HTPP, which is expected to be fostered in the forthcoming years, will require technologies not dependent on sample dark adaptations and able to operate at medium-range distance, where the family of techniques based on LIF may play a role. Finally, the development of low-cost HTPP platforms [128], required to improve plant breeding in developing countries, is expected to make use of the less expensive Chl measurement techniques, namely passive fluorescence. On the other hand, high-technology in-house HTPP platforms are expected to make simultaneously use of different Chl fluores‐ cence techniques, integrated in a systems approach to plant phenomics.
