Abstract
The evolutionary path of Asian wild rice (Oryza perennis Moench) to cultivated rice (O. sativa L.) was investigated embryologically. Exponential growth of the embryo of every strain or species started at the 100-200-cell stage and showed wider variation in embryo shape at the globular than at the following stage. The variation in embryo shape decreased in conjunction with the evolutionary path. The number of cells of a final globular embryo gradually decreased from O. perennis toward O. sativa through the intermediate Jeypore strains. These observations indicate that the advanced species gain developmental stability by shortening the unstable globular stage. Such a reduction of the globular stage also occurs in the evolutionary process in monocotyledons at the order level.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
