ABSTRACT

In the process of selecting for cold-tolerant cotton (genotypes that will eventually germinate, emerge, and grow normally after ultra-early planting), widely divergent responses to temperature were observed. Tests of response to temperature suggest a range of minima for plant growth depending on genotype. Germination occurred over the range tested, 45 to 80 F., at very slow rates at lower temperatures, and varying with genotype. Differences in plant growth response to low temperatures are also reported.