Assessment of Genetic Relationship among Tropical and Temperate Maize Populations by Mixed (AD) Model Study of reason of "the older, the better" of Pericarpium Citri Reticulatae(PCR) which contributed increase of flavonoids Studies on the Heterosis of Barley (Hordeum vulgare L.) SEVERAL BETTER MEDIA FOR CULTURING MESOPHYLL PROTOPLASTS OF PETUNIA HYBRIDA The regulatory network mediated by circadian clock genes is related to heterosis in rice