What is a defining feature of endophytic turfgrass?

Endophytic turfgrass is characterized by the incorporation of fungal agents that live within the plant tissues without causing any harm to the host plant. This symbiotic relationship is beneficial for several reasons. The fungal endophytes can enhance the grass's resistance to various stresses, such as drought and pests, by producing secondary metabolites that deter herbivores and pathogens. This unique feature allows the turfgrass to maintain its health and vigor even under less than ideal growing conditions.

While resistance to drought, growth in extreme temperatures, and high nutrient absorption can be attributes of turfgrass, they are not defining features of endophytic varieties specifically. Such advantages stem primarily from the relationship established between grass plants and endophytes, which is why the incorporation of fungal agents is the correct answer. This characteristic is of particular interest to turf management and landscaping professionals, as it contributes to more resilient and sustainable grass varieties in various environments.