Genetic contribution to yield gains in the Florida sugarcane industry across 33 years

摘要: Sugarcane (Saccharum spp.) is a successful crop in the Florida Everglades Agricultural Area (EAA) that characterized by high-N organic and low-fertility sandy soils, periodic freeze, flood events. After 50 yr of breeding, possibility yield plateau was investigated cooperative sugarcane breeding program via an assessment gains industry evaluation contribution attributed to efforts. Long-term commercial selection trial data, covering 33-yr period (1968-2000), were used single-degree-of-freedom regression analyses determine rates improvement sucrose content (SC; kg Mg -1 ), cane (CY; ha sugar (SY; ). Analyses data reflected yearly increases 0.80 ± 0.08 for SC, 0.31 0.10 CY, 0.01 SY. Corresponding from 0.74 0.15 , 1.06 0.40 0.16 0.05 respectively. Improvements significant all three traits across plant-cane, first- second-ratoon crops grown on soils but not soils. About 69% total gain SY Canal Point public program, greater allocation assimilates toward accumulation, resulting $99 203 million as additional profits economy 33 yr. The genetic potential working germplasm has been exhausted (no evidence SC) this program. These future advances are possible because use diverse gene pool strategy integrates growers' participation into