Optimum Temperature and Humidity Ratio for Hybrid Rice Seed Production at Flowering Stage

Effect of temperature and humidity combination on flowering habits and activity of enzyme in spikelets were studied using Zhenshan 97A (cytoplasmic male sterile line) and Ce 64 7(restorer line) as materials. Temperature and humidity ratio affected differently flowering habits of cytoplasmic male sterile line and restorer line. A quadratic regression could be used to describe the relationship between index of blooming time synchronization (IBTS) and temperature and humidity ratio. There was a optimum temperature and humidity ratio at flowering stage (40 for Shanyou 64). Activity of enzyme (peroxidase, catalase) in spikelets was differently influenced by temperature under different humidity.