
TY  - JOUR
A1  - Yamada, Toshihiro 
A1  - Imaichi, Ryoko 
A1  - Prakash, Nallamilli 
A1  - Kato, Masahiro 
T1  - Developmental morphology of ovules and seeds of Austrobaileyales
JF  - Australian Journal of Botany
JO  - Aust. J. Bot.
Y1  - 2003
VL  - 51
IS  - 5
SP  - 555
EP  - 564
KW  - 
UR  - https://doi.org/10.1071/BT03056 
N2  - Development of ovules of Illicium anisatum (Illiciaceae), Trimenia moorei (Trimeniaceae), and Austrobaileya scandens (Austrobaileyaceae) (Austrobaileyales) was observed. In Austrobaileya scandens and Trimenia moorei the outer integument is hood-shaped, while it is cup-shaped in Illicium anisatum. On the basis of a phylogeny, the ovule with the hood-shaped outer integument is suggested to be primitive in Austrobaileyales. Seed development of Austrobaileyales was also examined. In Austrobaileya scandens the seed is mesotestal, ruminated, not pachychalazal, and has a micropyle&#8211;hilum complex. In Trimenia moorei the seed is exotestal, perispermous, not pachychalazal, and has a micropyle&#8211;hilum complex and a circular cap. The seed of Illicium anisatum is exotestal, not pachychalazal, and has a circular cap. Taking the character states of other basal angiosperms into account, primitive seeds of angiosperms are inferred to have such characters as the unilayered exotestal mechanical tissue, circular cap, micropyle&#8211;hilum complex and non-pachychalazy. The inferred primitive seed is very simple, suggesting that a great diversity of seeds is established through elaboration of organs/tissues of seeds, and not through reduction as hypothesised previously. 
ER  -

