ISSN: 0041-3216 (Online), 0041-3216 (Print)
Volume 70 Number 4
Effect of temperature on germination and seedling emergence of grain sorghum genotypes
Poor emergence under high soil temperature conditions is a serious problem in adoption of new grain sorghum [Sorghum bicolor (L.) Moench] cultivars in semiarid areas. Field emergence studies were conducted under high temperature conditions in Niger, and the United States. These results were related to % germination obtained in the laboratory over a range of temperatures. Genotypes P1044 and P1056 emerged best across environments, but the genotype P954035 emerged best in Niger. Per cent germination on the gradient table was highest at 27-33Â°C for all genotypes. At these temperatures, genotypes P1056, P1006, P967083, Pl016, and P1045 had the highest % germination (>80%). Correlation of % germination with % emergence was greatest at 30/30Â°C with values ranging from 0.44 to 0. 76 and decreased to correlations of 0.20 to 0.48 as temperature increased to 30/45Â°C, indicating that other factors in addition to temperature influenced emergence. Based on % germination and emergence, genotypes P1044 and P1056 merit further study as potential germplasm sources for improving stand establishment of grain sorghum.
Keywords: Temperature; Germination; Seedling emergence; Grain sorghum genotypes