Zur Kenntnis des Befruchtungsvorganges bei Impatients Glanduligera Lindl

Steffen, Kurt

doi:10.1007/bf01909396

Cited by 31 publications

(2 citation statements)

References 91 publications

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“…This matter as it affects angiosperms in general has been a topic for speculation for many years. Whereas STEFFEN (1951) and others have argued that in some plants the guidance must be purely mechanical, experimental evidence from other species -notably that adduced by ROSEN (1961) and WELK, MILLINGTON & ROSEN (1965) from observations on Lilium -suggests that diffusible chemotropic factors originating from the vicinity of the micropyle are responsible for the final directionality ofgrowth. These factors could be the products of the tissues of the nucellus, or of the adjacent integuments.…”

Section: Introductionmentioning

confidence: 99%

The Pollen-Stigma Interaction in the Grasses. 7. Pollen-Tube Guidance and the Regulation of Tube Number in Zea Mays L.

Heslop‐Harrison

Reger³

1985

Acta Botanica Neerlandica

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SUMMARY The stigma of Zea mays can support the hydration and germination of considerable numbers of pollen grains, yet, in general, only one tube enters the micropyle to effect fertilisation. The numbers are reduced at various points in the pollen tube pathway, (1) by competition on the receptive trichomes and in the transmitting tracts, (2) by elimination of late‐entering tubes at the stigma abscission zone, (3) at a constricted zone of the transmitting tracts in the upper ovary wall, and (4) in the vicinity of the micropyle. The control imposed at the abscission zone is higly effective. The entry of the first few tubes into the ovary wall induces a loss of turgidity of the cells of the zone and a disruption of the vasculation, and thereafter further tubes are irrevocably blocked in the main body of the stigma. The device maximises the period available for pollen capture and yet provides for the strict regulation of the number of tubes ultimately entering the ovary once pollination has taken place. Pollen tubes enter the ovary cavity by breaking through the inner epidermis of the ovary wall, which, like the contiguous inner integument, bears a thin discontinuous cuticle. Further passage is between the inner epidermis and the integument. Growth is irregular, but not wholly random, the tubes orienting themselves in the general direction of the micropyle following lines demarcated by the elongated cells of the epidermis and the integument. Almost throughout the pollen tube pathway, the cells in the vicinity show characteristics suggestive of a secretory function. The significance of this for pollen tube nutrition and guidance is briefly discussed.

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Section: Introductionmentioning

confidence: 99%

The Pollen-Stigma Interaction in the Grasses. 7. Pollen-Tube Guidance and the Regulation of Tube Number in Zea Mays L.

Heslop‐Harrison

Reger³

1985

Acta Botanica Neerlandica

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“…So weil3 man z . B. beim rein mutterlichen Erbgang immer no& nicht genau daruber Bescheid, wann und auf welche Weise die Eliminierung der extrachromosomalen Erbtrager des Vaters erfolgt (siehe auch STEFFEN, 1951, JFNSEN 1972.…”

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Das Zahlenverhältnis von mütterlichen und väterlichen Piastiden in den Zygoten von Oenothera erythrosepala Borbas (syn. Oe. lamarckiana )

Meyer

Stubbe

1974

Berichte der Deutschen Botanischen Gesellschaft

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A Periodic Acid‐schiff's Substance Related to the Directional Growth of Pollen Tube Into Embryo Sac in Paspalum Ovules

Chao

1971

American J of Botany

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The presence of a periodic acid‐Schiff's (PAS) substance at the micropylar portion of the ovules of Paspalum orbiculare and three other species of Paspalum has been revealed by improved cytological techniques. The substance is located in the distal portion of the outer integument, especially at its edges, and in the micropyle, which is formed by the inner integument. A study of the origin of this substance in P. orbiculare indicates that it is produced from the cellular material of the dissolved cells in situ. The PAS substance is highly water soluble and may contain some protein. The final directional growth of the pollen tube into the filiform apparatus of the degenerated synergid is related to this substance. The role of the synergids in its formation is discussed.

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Zur Kenntnis des Befruchtungsvorganges bei Impatients Glanduligera Lindl

Cited by 31 publications

References 91 publications

The Pollen-Stigma Interaction in the Grasses. 7. Pollen-Tube Guidance and the Regulation of Tube Number in Zea Mays L.

The Pollen-Stigma Interaction in the Grasses. 7. Pollen-Tube Guidance and the Regulation of Tube Number in Zea Mays L.

Das Zahlenverhältnis von mütterlichen und väterlichen Piastiden in den Zygoten von Oenothera erythrosepala Borbas (syn. Oe. lamarckiana )

A Periodic Acid‐schiff's Substance Related to the Directional Growth of Pollen Tube Into Embryo Sac in Paspalum Ovules

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