A Contribution to the Life History of Apocynum androsaemifolium

Frye, T. C.; Blodgett, Eleanor B.

doi:10.1086/328645

Cited by 12 publications

(6 citation statements)

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“…In the majority of the Apocynaceae the simultaneous pollen mother cell division is predominant. Frye and Blodgett (1905) observed this in Apocynum, Tackholm and Soderberg (1918) in Vinca, Rau (1940) in Cerhera and Vallaris Mey iported in In the Periplocoideae of the Asclepiadaceae, the simuhaneous pollen cell division is predominant just as in Apocynaceae. The resulting tetrads are usually tetrahedral and isobilateral depending on the direction of the second meiotic spindle.…”

Section: Discussionmentioning

confidence: 87%

“…Several morphologists have investigated this problem â€" Frye (1901), Gager (1902), Richharia (1934) and others â€" but almost all agree that there is no evidence provided by ontogenetic studies of several genera. Engler (1876) came to the empiric conclusion that only the anterior locules are developed and believed that the posterior locules become diverted to the formation of the hyaline appendage of the anthers.…”

Section: Discussionmentioning

confidence: 99%

“…And, as one approaches the regions of the stigma head which bear the translators, not only the cells of the stigma head become protuberant but also the adjacent cells of the stamens; this is a well-known character in many Apocynaceae. Frye and Blodgett (1905) described the relationship between the anthers and the stigma head of Apocynum thus "Immediately beneath the anther locules is a beard of epidermal hairs extending transversely across the faces of the anthers, forming a ring around the stigmatic head (figs. 1, 2, b).…”

Section: Methodsmentioning

confidence: 99%

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The Floral Morphology of Secamone and the Evolution of the Pollinating Apparatus in Asclepiadaceae

Safwat¹

1962

Annals of the Missouri Botanical Garden

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The floral anatomy and morphology of several species of Secamone is discussed. Ontogenetic studies reveal that the anthers are 4-Ioculan In this respect Secamone differs from other members of the subfamily Cynanchoideae of Asclepiadaceae. The bilocular anthers of other Cynanchoideae are a result of phylogenetic suppression of the two outer locules of each anther, as shown by ontogenetic studies and by the origin and nature of the tapetal tissue. Ontogeny of the pollinum sacs is followed in Secamone. Pollen mother cells undergo considerable elongation before the formation of the tetrads. The two meiotic divisions are simultaneous, contrasting in this respect with the successive divisions of other Cynanchoideae and agreeing with the Periplocoideae and Apocynaceae. The resulting tetrads have different configurations depending on the direction of the second meiotic spindle; they are rhomboidal or T-shaped. This is in sharp contrast to the linear tetrads characteristic of all other members of Cynanchoideae, but similar to Periplocoideae and Apocynaceae. The ontogeny of the stigma head is followed, which reveals that at maturity the entire stigma head of Secamone is glandular, contrasting sharply with the five restricted glandular regions of this structure in other Asclepiadaceae and agreeing with similar structures of the Apocynaceae. The five glandular furrows of Secamone in which the simple translators are secreted are not well defined. Each translator consists of a more or less solid portion which is pushed upward and slightly outward by another more or less fluid substance. Thus the whole translator of Secamone is comparable to the stalk-adhesive disc of Periplocoideae and the corpusculum of higher Cynanchoideae. Secamone thus presents several primitive characters shared with Periplocoideae and Apocynaceae but not with other Cynanchoideae (where it has been placed by taxonomists). It shares with other Cynanchoideae, however, the presence of pollinium sacs and a primitive development of the translators. It is difficult to draw a sharp line between members of Apocynaceae and Aslepiadaceae since they apparently represent closely consecutive levels of floral evolution.

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Section: Discussionmentioning

confidence: 87%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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The Floral Morphology of Secamone and the Evolution of the Pollinating Apparatus in Asclepiadaceae

Safwat¹

1962

Annals of the Missouri Botanical Garden

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“…In addition, it has been shown that A. orientalis prefers slightly alkaline, sandy-loamy soils, saltys, mid-calcareous, with poor organic material, and very rich in iron and magnesium (Özen 2006). The noteworthy contributions to the embryological studies of the Apocynaceae were made by Fyre and Blodgett (1905), Guignard (1917), Anderson (1931), Schnarf (1931), Meyer (1938) and Rau (1940). While summarizing the embryological data on Apocynaceae, Davis (1966) mentioned the controversy concerning the nature of division of microspore mother cells, and due to the occurrence of different types of embryogeny Apocynaceae was termed a heterogeneous group by Maheshwari in 1971.…”

Section: Introductionmentioning

confidence: 99%

Investigation of mitosis, microsporogenesis and pollen germination in the critically endangered plantAmsonia orientalis(Apocynaceae)

2013

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Amsonia orientalis Decne. (Apocynaceae) is a medically useful and critically endangered plant which has very restricted distribution world-wide. The root tips and flower buds of A. orientalis were used as an experimental material and they were squashed in aceto-orcein. Fresh flowers and a liquid medium were used for pollen germination tests. In spite of the small size of the cells and chromosomes, all phases of mitosis and meiosis were observed. Generally the phases of mitosis were regular but there were a few abnormalities, such as laggard chromosome in metaphase and bridge formation in anaphase. There was a good relationship between the stages of pollen development and floral bud length. As a result of the cytokinesis, tetrahedral types of tetrads were occurred in microsporogenesis. The tetrad nuclei resulting from the simultaneous type of meiosis were found to be of equal size. Pollen germination had started from the first hour and pollen tube lengths and germination percentages regularly increased with increasing time. This is the first study that identifies mitotic and meiotic cycles and pollen germination in A. orientalis. Our findings about the mitosis and reproduction biology of this critically endangered plant will be useful for in vitro and in situ conservation, taxonomic and genetic studies.

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“…Hier ist eine Untersuchung von FRYE und BLODGETT (1905) bei Apocynum androsaemifolium ausge fuhrt worden; auf Tafel II, Figur 8 wird eine sukzedane Teilungs figur abgebildet.…”

unclassified

Zytologische Untersuchungen über die Haploidgeneration der Apocynaceen

Schürhoff¹,

Müller²

1937

CYTOLOGIA

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A Contribution to the Life History of Apocynum androsaemifolium

Cited by 12 publications

References 0 publications

The Floral Morphology of Secamone and the Evolution of the Pollinating Apparatus in Asclepiadaceae

The Floral Morphology of Secamone and the Evolution of the Pollinating Apparatus in Asclepiadaceae

Investigation of mitosis, microsporogenesis and pollen germination in the critically endangered plantAmsonia orientalis(Apocynaceae)

Zytologische Untersuchungen über die Haploidgeneration der Apocynaceen

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