Ontogeny of pollen wall of<i>leontodon autumnalis</i>(hypochoeridinae, compositae)

El‐Ghazaly, Gamal

doi:10.1080/00173138209427686

Cited by 18 publications

(1 citation statement)

References 12 publications

(9 reference statements)

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“…Amongst taxa with acaveate pollen Gerbera jamesonii (Southworth, 1966) and Artemisia vulgaris (Rowley and Dahl, 1977) have been investigated. The development of caveate pollen has been studied in Cosmos bipinnatus {Dickinson and Potter, 1976), Helianthus annuus (Homer and Pearson, 1978), Leontodon autumnalis (EI-Ghazaly, 1982), Scorzonera hispanica and S. humilis (Blackmore and Dickinson, in prep.). The latter three species, members of tribe Lactuceae, have very narrow caveae traversed in places by a few slender columellae.…”

Section: Ontogeny and Evolutionmentioning

confidence: 99%

On the terminology, origins and functions of caveate pollen in compositae

Blackmore¹,

Helvoort²,

Punt³

1984

Review of Palaeobotany and Palynology

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Section: Ontogeny and Evolutionmentioning

confidence: 99%

On the terminology, origins and functions of caveate pollen in compositae

Blackmore¹,

Helvoort²,

Punt³

1984

Review of Palaeobotany and Palynology

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Plesiomorphic and apomorphic pollen structure characteristics of anthemideae (Asteroideae: Asteraceae)

Vezey

Watson

Skvarla

et al. 1994

American J of Botany

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Anthemideae (Asteroideae: Asteraceae) pollen grains have basal columellae, a structural type called “anthemoid” in earlier publications. To survey structure variation in Anthemideae pollen, we examined freeze‐sectioned grains from 45 species within 23 representative genera using scanning electron microscopy (SEM). From resulting data and a literature review, we concluded that: 1) pollen of Anthemideae taxa is qualitatively identical except for Ursinia (grains essentially lack basal columellae) and the Artemisia group (branches of basal columellae are complex and interwoven); 2) the double tectum (a term introduced in this study) is a synapomorphy of Asteroideae and plesiomorphic in Anthemideae; 3) apomorphies of Anthemideae grains include large basal columellae, a thick foot layer, and absence of internal foramina; and 4) Anthemideae pollen is qualitatively different from similar pollen in Lactucoideae, a distinction we recognized by restricting “anthemoid” to Anthemideae grains. Ursinia grains have occasional basal columellae and features resembling rolled‐up columellae; we consider these vestiges of a reversal to the plesiomorphic condition. To assess quantitative structural variation, 2,200 image‐analysis measurements were taken from 73 SEM micrographs. Intrageneric variation was analyzed by standard deviation, and intergeneric variation by principal components analysis. Compared to other Anthemideae taxa, the structural elements of Artemisia grains have reduced dimensions and variability. Otherwise, structural radiation of Anthemideae pollen has produced a phenetic continuum.

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Oberflächenskulpturen bei höheren Pflanzen

Barthlott

Schill

1985

Progress in Botany

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Ontogeny of pollen wall ofleontodon autumnalis(hypochoeridinae, compositae)

Cited by 18 publications

References 12 publications

On the terminology, origins and functions of caveate pollen in compositae

On the terminology, origins and functions of caveate pollen in compositae

Plesiomorphic and apomorphic pollen structure characteristics of anthemideae (Asteroideae: Asteraceae)

Oberflächenskulpturen bei höheren Pflanzen

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