TY - JOUR
T1 - Evolutionary considerations of the presence of both morphophysiological and physiological seed dormancy in the highly advanced euasterids II order Dipsacales
AU - Baskin, Jerry M.
AU - Hidayati, Siti N.
AU - Baskin, Carol C.
AU - Walck, Jeffrey L.
AU - Huang, Zhen Ying
AU - Chien, Ching Te
PY - 2006/12
Y1 - 2006/12
N2 - Although the underdeveloped embryo, and thus morphological (MD) or morphophysiological (MPD) seed dormancy, is basal in angiosperms, it also occurs in advanced groups. A synthesis of the literature, combining phylogeny and the kind of seed dormancy in the highly evolutionary advanced order Dipsacales, shows that MPD (or MD) occurs throughout all clades except the most advanced one, Valerina. Seeds of taxa in the Valerina clade have fully developed embryos and physiological dormancy (PD) or are non-dormant (ND); thus, PD and ND are derived conditions in Dipsacales. Assuming that types of seed dormancy have not changed since the Early Tertiary, the fossil record suggests that MPD (or MD) was present in extant genera of Dipsacales by the Palaeocene, but PD (or ND) not until the Miocene. Molecular dating indicates that the ages of dipsacalean lineages with MPD and PD are older than those indicated by the fossil evidence.
AB - Although the underdeveloped embryo, and thus morphological (MD) or morphophysiological (MPD) seed dormancy, is basal in angiosperms, it also occurs in advanced groups. A synthesis of the literature, combining phylogeny and the kind of seed dormancy in the highly evolutionary advanced order Dipsacales, shows that MPD (or MD) occurs throughout all clades except the most advanced one, Valerina. Seeds of taxa in the Valerina clade have fully developed embryos and physiological dormancy (PD) or are non-dormant (ND); thus, PD and ND are derived conditions in Dipsacales. Assuming that types of seed dormancy have not changed since the Early Tertiary, the fossil record suggests that MPD (or MD) was present in extant genera of Dipsacales by the Palaeocene, but PD (or ND) not until the Miocene. Molecular dating indicates that the ages of dipsacalean lineages with MPD and PD are older than those indicated by the fossil evidence.
KW - Dipsacales
KW - Evolution of seed dormancy
KW - Fossil fruits and seeds
KW - Morphophysiological dormancy
KW - Phylogeny
KW - Physiological dormancy
KW - Underdeveloped embryo
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U2 - 10.1017/SSR2006256
DO - 10.1017/SSR2006256
M3 - Review article
AN - SCOPUS:33846828393
SN - 0960-2585
VL - 16
SP - 233
EP - 242
JO - Seed Science Research
JF - Seed Science Research
IS - 4
ER -