The relationship between color on YED and growth on MV relates to an organism's nutritional requirements and ability to synthesize compounds. Red colonies may indicate a need for pre-formed organic compounds available in YED but absent in MV. Blue colonies on MV suggest the organism can synthesize all necessary nutrients from minimal ingredients.
The relationship between color on YED (yeast extract dextrose) and the ability to grow on MV (minimal medium) boils down to the specific nutritional requirements of different microbial organisms. For example, organisms that can grow on a minimal medium such as MV typically can synthesize all of their necessary compounds from basic ingredients. In contrast, others, which only grow on rich media like YED, require pre-formed organic compounds such as amino acids, vitamins, or other growth factors that are not present in minimal media.
As for the specific colors, red colonies may represent one type of organism that can grow on YED but not on MV, suggesting these organisms require certain nutrients that YED provides but MV does not. Conversely, if an organism grows on MV and results in blue colonies, it has the metabolic pathways to synthesize all necessary compounds from the minimal ingredients present.
The inability of some colors (representing specific organisms) to grow on MV can be due to the lack of a crucial nutrient, such as certain amino acids, vitamins, or nucleotides, which the organism cannot synthesize independently. Without these nutrients, these organisms cannot complete their growth cycle and thus do not grow on MV media.