The performance of rice grain filling and its relationship with characteristics of tolerance to photooxidation in early and late seasons

The performance of rice grain filling and its relationship with characteristics of tolerance to photooxidation in early and late seasens were studied. The results indicate that the time of maximum grain filling rate and the stopping time of fast grown grain filling are later in the rice cultivars with the adaptation to high light intensity, and every parameter in grain filling period are relatively stable in different seasons. The reverse is true in the rice varieties with sensitivity to photooxidation.