germination-biology
Germination biology examines the physiological and molecular processes that drive a seed's transition from dormancy to active growth, including water uptake, hormone signaling, and metabolic activation. Understanding these mechanisms is essential for improving crop establishment, predicting plant responses to environmental conditions like temperature and moisture, and developing strategies to enhance seed viability and agricultural productivity. This research also sheds light on evolutionary adaptations that allow plants to time their emergence for optimal survival and reproduction.
open_in_new WikipediaPubMed · 2026-07-04
A new review maps how a large family of plant proteins called R2R3-MYB transcription factors controls when seeds stay dormant versus when they sprout. These proteins act as molecular switches, reading hormone signals to decide whether a seed should wait or grow.
R2R3-MYB transcription factors have expanded dramatically in land plants and regulate dormancy, germination, seed size, and seed-coat pigmentation across species.
Specific members including MYB56, MYB62, MYB96, and MYB30 integrate signals from at least four hormones (ABA, GA, jasmonates, and nitric oxide) to balance dormancy and germination.
A phylogenetic analysis revealed lineage-specific gene groupings and conserved evolutionary clades within the R2R3-MYB family, tracing its origins to roughly one billion years ago in early eukaryotes.