When the temperature goes down to extreme cool, the seedling becomes yellow and died. So, it's necessary to protect them from this cold injury in winter season.
In laboratory conditions, it should kept in the greenhouse chamber within which temperature should be possible to maintain. But in filed condition for cultivation purpose, cold stable hybrid varieties rice seed should be used. Researcher tried to developed various stress resist varieties of rice plants.
in addition to using cold stable hybrid rice cultivars, immersing the root of rice seedling with water is suggested. rice roots are hydrophilic and absorb more water to prevent seedling senescence.