There is considerable literature on the ecology of seeds with impermeable coats, ie, physical
dormancy (PY), but the factors controlling the development of PY and their ecological …

Seed germination and dormancy are vital components of seed quality; hence,
understanding these processes is essential for a sound seed production system. The two …

Background For species that produce seeds with a water-impermeable coat, ie physical
dormancy (PY), it has been widely recognized that (1) seeds shed at a permeable state …

Species producing seeds with a water‐impermeable seed coat, ie, physical dormancy (PY),
dominate the dry tropical forests. Despite increasing interest and understanding of the …

Physical dormancy (PY) occurs in at least 18 angiosperm plant families and is caused by
water-impermeable palisade cells in seed (or fruit) coats. Breaking of PY involves disruption …

Under natural conditions, large seeds with physical dormancy (PY) may become water
permeable earlier than small ones. However, the mechanism for this difference has not been …

Cycling of physically dormant (PY) seeds between states insensitive and sensitive to
dormancy-breaking factors in the environment has recently been demonstrated in Fabaceae …

Background and Aims The involvement of two steps in the physical dormancy (PY)-breaking
process previously has been demonstrated in seeds of Fabaceae and Convolvulaceae …

Many studies have claimed that fire acts as the chief ecological factor cueing dormancy
break in seeds with a water-impermeable seed coat, ie physical dormancy (PY), in …

Abstract Background and Aims Physical dormancy (PY)-break in some annual plant species
is a two-step process controlled by two different temperature and/or moisture regimes. The …