How do plant pathogenic fungi primarily enter plant tissues?

Plant pathogenic fungi primarily enter plant tissues by penetrating through wounds or natural openings. This method allows fungi to access the internal tissues of the plant, where they can establish themselves and proliferate. Wounds can be caused by various factors, including physical damage, insect activity, or even environmental stress, creating ideal entry points for these pathogens.

Natural openings, such as stomata, also provide a direct pathway for fungi to penetrate plant defenses. Once inside, the fungi can evade the plant's immune response, extract nutrients, and ultimately cause disease.

The other options touch on aspects of plant and soil interactions but do not accurately describe the primary entry mechanism of fungal pathogens. Water absorption, root exudation, and migration through air currents do not facilitate the direct invasion of plant tissues by fungi in the same aggressive manner as penetrating through wounds or natural openings.