TY - JOUR T1 - Die Zweihäusigkeit bei der Blütenpflanze A1 - Rispens, Jan Albert JA - Elem. d. Naturw. JF - Elemente der Naturwissenschaft PY - 1991 VL - 55 SP - 1 EP - 20 DO - 10.18756/edn.55.1 SN - p-ISSN 0422-9630 LA - de N2 -

Bei einer Anzahl von Blütenpflanzen wird die Einheit in der Blüte mit Staubgefässen und Samenanlagen aufgehoben, indem zwei verschiedene Blütentypen auftreten: Blüten welche nur Staubgefäße tragen und solche die nur Fruchtknoten zeigen. Arten bei denen die Einzelpflanze beide Blütentypen trägt nennt man «einhäusig». Tragen Pflanzen entweder nur Staubgefäß- oder nur Fruchtknotenblüten, wird die Art «zweihäusig» genannt. [...] Obwohl vielleicht der Eindruck entstehen kann, daß die Zweihäusigkeit - wegen des Zerfalls der Einheit in der Blüte - eine «primitive» Stufe im Blütenpflanzenbereich darstellt‚ zeigt das oft rudimentär Vorhandensein von Fruchtknoten in männlichen Blüten, oder von Staubgefäßen in weiblichen, daß es hier um eine Höherentwicklung geht. Weiterhin läßt sich das Phänomen Zweihäusigkeit wiederfinden in manchen Familien welche als «hochentwickelt» bezeichnet werden, wie zum Beispiel die Korbblütler (Antennaria dioica), die Doldengewächse (Trinia glauca) oder die Rosengewächse (Amncus dioicus). Außerdem findet man die Zweihäusigkeit in unserer krautigen Flora vor in Familien wie z.B. den Ampfergewächsen, den Nesselgewächsen, den Baldriangewächsen, den Nelkengewächsen, den Gänsefußgewächsen, aber auch in manchen Bäumen (Salix, Populus, Fraxinus ) und Sträuchern (Hippophaë). [...]

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Sexual dimorphism can be found in many dicotyle plant—families. This research shows that great differences can be observed in the morphology and development between pollen (male)- and seed (female) plants. The pollen plant suppresses vegetative growth in favour of the flowering impuls. The latter penetrates the plant in all its aspects: it develops relatively few and small leaves, big inflorescences and well formed flowers. This can be expressed as an «appearing for the senses». The seed plant emphasises vegetative growth in the beginning of its development. Here, the flowering impuls remains in the background. Many big leaves are formed, inflorescences are retained and frequently wrapped with leaves. The flowers themselve are less formed, often smaller than male flowers and interpenetrated by vegetative growth. After pollination seed plants show induration processes inwardly by wich very distinct substances can be produced that can not be found - or in very lesser amount - in male plants. This can be interpreted as a fructification process extending over the entire plant. The pollen plant becomes flower, the seed plant as a whole becomes fruit. This has considerable consequences for the substantial quality of both plant-types and can be of great importance for pharmaceutical preparations. It is also purpose of this article to find a suitable expression for the masculine and feminine quality in plants.
 

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Sexual dimorphism can be found in many dicotyle plant—families. This research shows that great differences can be observed in the morphology and development between pollen (male)- and seed (female) plants. The pollen plant suppresses vegetative growth in favour of the flowering impuls. The latter penetrates the plant in all its aspects: it develops relatively few and small leaves, big inflorescences and well formed flowers. This can be expressed as an «appearing for the senses». The seed plant emphasises vegetative growth in the beginning of its development. Here, the flowering impuls remains in the background. Many big leaves are formed, inflorescences are retained and frequently wrapped with leaves. The flowers themselve are less formed, often smaller than male flowers and interpenetrated by vegetative growth. After pollination seed plants show induration processes inwardly by wich very distinct substances can be produced that can not be found - or in very lesser amount - in male plants. This can be interpreted as a fructification process extending over the entire plant. The pollen plant becomes flower, the seed plant as a whole becomes fruit. This has considerable consequences for the substantial quality of both plant-types and can be of great importance for pharmaceutical preparations. It is also purpose of this article to find a suitable expression for the masculine and feminine quality in plants.
 

ST - Die Zweihäusigkeit bei der Blütenpflanze UR - https://dx.doi.org/10.18756/edn.55.1 Y2 - 2024-05-03 10:18:24 ER -