The angiosperm suspensor and the mammalian trophoblast: organs with similar cell structure and function?

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Abstract
The suspensor of Angiosperms (models: Phaseolus and Geranium) and the trophoblast of Mammals (models: Rattus and Mus) are compared. Striking similarities can be found in development, chromosome behaviour (endomitoses, DNA amplification, formation of polytcne chromosomes), and ultrastructure of cell membranes and walls (wall ingrowths and microvilli, intranuclear «ER» and intranuclear annulate lamellae, respectively). On the basis of these and further correspondences, similar functions of both organs, the suspensor and the trophoblast, can be assumed for embryonic development. Possibly, both organs are concerned with the synthesis of specific material (e.g. enzymes or hormones), and with the transport of nutritive substance.