What is the role of $PGR$?

(N/A) $PGR$ (Plant Growth Regulators) play a vital role in every phase of plant growth,differentiation,and development.
These roles can be complementary or antagonistic,and they may act individually or synergistically.
In many physiological events,such as seed or bud dormancy,abscission,senescence,and apical dominance,multiple $PGRs$ interact to regulate the process.
$PGRs$ represent a form of intrinsic control within the plant.
Along with genomic control and extrinsic factors,they are essential for regulating plant growth and development.
Many extrinsic factors,such as temperature and light,influence plant growth and development by modulating the activity of $PGRs$.
Examples of such processes include vernalization,flowering,dormancy,seed germination,and plant movements.