Abstract:】 Reduced genetic variability of crop cultivars, which is indicated by similar genetic bases among leading varieties, has resulted in fragile recovery mechanisms, increased presence and severity of plant disease and pest damage, and increased lodging, especially in maize. Variation in climatic conditions between years in China, which cause drought or water logging depending on the year, can result in very variable yields per unit area. Therefore, we propose increased maize genetic diversity is important to co...