auxin-biology
Auxin biology is the study of auxins, a class of plant hormones—most notably indole-3-acetic acid (IAA)—that regulate fundamental aspects of plant growth and development, including cell elongation, root initiation, and tropic responses. These signaling molecules orchestrate how plants respond to environmental cues such as light and gravity by creating directional gradients that drive differential growth. Understanding auxin biology is central to plant science because it underpins processes ranging from embryonic patterning to organ formation, with implications for improving crop architecture, root development, and stress resilience.
open_in_new WikipediaPubMed · 2026-05-06
Scientists identified 104 copies of a plant growth gene called YUCCA across four cotton species and showed that one key version, GhYUC19, controls how tall cotton grows, how it branches, and whether its flowers form correctly. The findings open doors for breeding or engineering cotton with improved architecture and yield.
104 YUCCA auxin-biosynthesis genes were identified across four cotton species and grouped into four evolutionary clusters with highly conserved structures
Overexpressing GhYUC19 in a model plant increased plant height and caused downward-curling leaves, but shrank fruit size and sharply reduced fertility
Silencing GhYUC19 in cotton via gene knockdown produced flowers with missing petals and fewer stamens, confirming its essential role in floral organ formation
