Exogenous abscisic acid suppresses the lignification and changes the growth, root anatomical structure and related gene profiles of carrot

Exogenous abscisic acid suppresses the lignification and changes the growth, root anatomical structure and related gene profiles of carrot: Plant hormones are essential elements that control a great number of cellular processes that occur during plant growth. Abscisic acid (ABA) is a plant hormone known for its roles in regulating growth/development and response to biotic/abiotic stresses of the plant. It modulates plant growth and development in many aspects, such as seed dormancy, stomata movement, and xylem fiber differentiation [1]. Furthermore, ABA can inhibit stem elongation and shoot growth, as well as reduce shoot weight, which results in the repression of the overall growth of the plant. It has been postulated that ABA inhibits shoot growth by restricting the synthesis of gibberellin [2].