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How does auxin influence root formation in plant cuttings?

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fern life cycle — Plant development The life cycle of the fern. (1) Clusters (sori) of sporangia (spore cases) grow on the undersurface of mature fern leaves. (2) Released from its spore case, the haploid spore is carried to the ground, where it germinates into a tiny, usually heart-shaped, gametophyte (gamete-producing structure), anchored to the ground by rhizoids (rootlike projections). (3) Under moist conditions, mature sperm are released from the antheridia and swim to the egg-producing archegonia that have formed on the gametophyte's lower surface. (4) When fertilization occurs, a zygote forms and develops into an embryo within the archegonium. (5) The embryo eventually grows larger than the gametophyte and becomes a sporophyte.

Auxin is a vital plant hormone that plays a key role in the formation of roots from cuttings. In plant development, the ability of a cutting to regenerate roots depends on an interaction between various internal substances, including auxins, carbohydrates, and nitrogenous compounds.123

When applied to the cut surface of a stem, auxins stimulate the plant to produce adventitious roots. While some plants root easily on their own, difficult-to-root species often require the application of synthetic auxins, such as indolebutyric acid, to achieve success. These synthetic compounds are highly valued in horticulture because they can resist the enzymatic destruction that naturally occurs with the primary plant auxin, indolylacetic acid, thereby prolonging the growth-promoting effect. Additionally, researchers have identified "rooting cofactors" that interact with auxin to further enhance the stimulation of root development.3412