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Reproductive unit

Strong chemical defenses of reproductive units such as seeds, bulbs, or tubers, as opposed to the vegetative parts, are commonplace. For instance, potatoes, which have to survive in the ground from one growing season to the next. [Pg.300]

Spatial separation and developmental divergence of male and female reproductive units in gymnosperms, and their relevance to the origin of the angiosperm flower... [Pg.8]

Yet the earliest fossil seed-plants from the Upper Devonian, such as Elkinsia polymorpha (Fig 2.6b Rothwell and Serbet, 1992) and Moresnetiazalesskyi (Fairon-Demaret and Scheckler, 1987), not only have unisexual reproductive units but may also be dioecious. If so, the onset of strong segregation of male and female reproductive organs coincides with, and hence maybe implicated in, the origin of the seed (Bateman and DiMichele, 1994). [Pg.27]

Although reproductive units undoubtedly develop at different locations in different pteridosperm groups (reviewed by Retallack and Dilcher, 1988), present evidence... [Pg.27]

The development ofmale and female reproductive units directly on the large fronds traditionally attributed to the conceptual whole-plant MeduZZosa is confidently illustrated in most palaeobotany textbooks, but appeared developmentally improbable... [Pg.29]

We offer this section as a reminder that the angiosperms are not the only seed-plant lineage to have evolved hermaphrodite reproductive units (i.e. flowers) plant morphology textbooks routinely feature the remarkable hermaphrodite... [Pg.30]

Rudall, P. J., Remizowa, M. V., Prenner, G. et al. (2009). Non-flowers near the base of extant angiosperms Spatiotemporal arrangement of organs in reproductive units of Hydatellaceae, and its bearing on the origin of the flower. American Journal of Botany, 96,67-82. [Pg.43]


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See also in sourсe #XX -- [ Pg.11 ]




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