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1. Plants are sterile when temperature exceeds 32°C/24°C (day/night) and becomes fertile when the temperature is below 24°C/18°C (day/night).
2. However, in few cases, sterility is observed at lower temperatures and fertility is observed at higher temperatures.
3. Such type of male sterility is referred to as ‘Reverse TGMS type’.
4. TGMS system can be utilized in tropical and sub-tropical countries, where there are large temperature differences across locations, regions, and seasons and at different attitudes.
5. For a vast country like India, with various regions and seasons and with attitude ranging from sea level to several thousand meters in hilly areas, TGMS system is an ideal one for deployment and development of two-line hybrids.
Agro Techniques for Hybrid Rice Cultivation and Seed Production - 2005, DRR Training Manual