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1. Photo-Thermo Sensitive Genetic Male Sterility line is controlled by the interaction of photoperiod and temperature. Most of the PGMS lines earlier identified such as the classical Nongken 58S were later reported to fall under this category.
2. PTGMS is just similar to the TGMS system in all respects except for the temperature regime in between the CSP and CFP, where the photoperiod sensitivity is observed.
3. At relatively low temperatures, short light hours ensure complete fertility, while at relatively higher temperature; still more short light hours are needed to make it completely fertile.
Agro Techniques for Hybrid Rice Cultivation and Seed Production - 2005, DRR Training Manual