Origin of the angiosperm gynoecium by gamoheterotopy

Meyen, Sergei V.

doi:10.1111/j.1095-8339.1988.tb02459.x

Cited by 39 publications

(13 citation statements)

References 14 publications

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“…Various hypotheses on the homologies of its parts with those of other seed plants have been proposed (e.g. Long, 1977Long, , 1984Doyle, 1978Doyle, , 1994Doyle & Donoghue, 1986;Retallack & Dilcher, 1981;Crane, 1985;Meyen, 1988;Friis & Endress, 1990;Kato, 1990Kato, , 1991Lloyd & Wells, 1992;Matsui, Imaichi & Kato, 1993;Taylor, Del Fueyo & Taylor, 1994;Nixon et al, 1994;Taylor & Kirchner, 1996). These hypotheses need to be continually reevaluated, as more data appear from different approaches to the problem.…”

Section: Introducttonmentioning

confidence: 99%

Gynoecium diversity and systematics of the Magnoliales and winteroids

Igersheim¹

1997

Botanical Journal of the Linnean Society

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Section: Introducttonmentioning

confidence: 99%

Gynoecium diversity and systematics of the Magnoliales and winteroids

Igersheim¹

1997

Botanical Journal of the Linnean Society

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Section: Introducttonmentioning

confidence: 99%

Gynoecium diversity and systematics of the Magnoliales and winteroids

Igersheim

Endress

1997

Botanical Journal of the Linnean Society

107

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Carpel and ovule structure was compared in representatives of all 11 families of the Magnoliales (Annonaceae, Canellaceae, Degeneriaceae, Eupomatiaccae, Himantandraceae, Magnoliaceae, Myristicaceae) and winteroids (Austrobaileyaceae, Illiciaceae, Sehisandraceae, Winteraceae). Special attention was paid to features that are constant at family level. Bisexual flowers are always protogynous. In all representatives studied the carpels are closed at anthesis. Caipel closure is attained in three different ways: (1) postgenital fusion of inner surfaces (Degeneriaceae, Eupomatiaccae. Winteraceae), or (2) occlusion by secretion (Austrobaileyaceae, Sehisandraceae), or (3) a combination of (1) and (2): in Annonaceae, Canellaceae, Myristicaceae there is a conspicuous secretory canal in the innermost part of the ventral slit; in Illiciaceae and Magnoliaceae there is a narrow canal in the innermost part of the ventral slit; and in Himantandraceae the ventral slit is postgenilally fused in the style but completely open in the ovary. In most families the carpels have a double stigmalic crest or they have two tips in the transversal symmetry plane (i.e. at right angles to the median plane). Stigmas are unicellular papillate in most families but the papillae are bi‐to multicellular (uniseriate) in Degeneriaceae and Eupomatiaceae. An unusual cryptic exlracarpellary compitum was found in Himantandraceae and Sehisandraceae. Intrusive oil cells were found in the carpel epidermis of Illiciaceae and Sehisandraceae. Mature ovules vary in length between 0.15 and 1.1 mm. The outer integument is fully annular (not semiannular) in Degeneriaceae, Himantandraceae, Canellaceae, Myristicaceae, and Illiciaceae. A rudimentary aril occurs in Canellaceae, and originates at the same site as in arillate Annonaceae and Myristicaceae. The results most strongly support an Annonaceae‐Myristicaceae‐Canellaceae alliance, to some degree also an Eupomatiaccac‐Degeneriaceae‐Himantandraceae‐Magnoliaceae alliance, and an Illiciaceae‐Schisandraceae‐Winteraccae‐Austrobaileyaceae alliance.

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“…In particular, he proposed that angiosperms may have originated from bennettites (Meyen, 1988, 1992). He viewed the development of a carpel and reception of the pollen by the stigmatic surface as most important features of angiosperms, even more important than the presence of a flower (Meyen, 1984a).…”

Section: Combining Laws Of Polymorphism With Other Factors Of Evolmentioning

confidence: 99%

Inferring directions of evolution from patterns of variation: The legacy of Sergei Meyen

Sharov¹,

Igamberdiev²

2014

Biosystems

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In the era of the Extended Evolutionary Synthesis, which no longer considers natural selection as the only leading factor of evolution, it is meaningful to revisit the legacy of biologists who discussed the role of alternative factors. Here we analyze the evolutionary views of Sergei Meyen (1935-1987), a paleobotanist who argued that the theory of evolution should incorporate a “nomothetical” approach which infers the laws of morphogenesis (i.e., form generation) from the observed patterns of variation in living organisms and in the fossil records. Meyen developed a theory of “repeated polymorphic sets” (RPSs), which he applied consistently to describe inter-organism variation in populations, intra-organism variation of metameric organs, variation of abnormalities, heterotopy, changes during embryo development, and inter-species variation within evolutionary lineages. The notion of RPS assumes the active nature of organisms that possess hidden morphogenic and behavioural capacities. Meyen's theory is compatible with Darwin's natural selection; however Meyen emphasized the importance of other forms of selection (e.g., selection of developmental trajectories, habitats, and behaviours) in choosing specific elements from the RPS. Finally, Meyen developed a new typological concept of time, where time represents variability (i.e., change) of real objects such as living organisms or geological formations.

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Origin of the angiosperm gynoecium by gamoheterotopy

Cited by 39 publications

References 14 publications

Gynoecium diversity and systematics of the Magnoliales and winteroids

Gynoecium diversity and systematics of the Magnoliales and winteroids

Gynoecium diversity and systematics of the Magnoliales and winteroids

Inferring directions of evolution from patterns of variation: The legacy of Sergei Meyen

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