Exine

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exine

[′ek‚sēn]

(botany)

The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Exine

(also exosporium), in seed plants, the outer layer of the wall of pollen grains (microspores). In many plants the outside of the exine has nodules or reticular enlargements, which form specific patterns characteristic of a particular species and are there fore often used to identify the species to which a pollen grain belongs.

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13) imply that pollen in the common ancestor of Canrightia and Chloranthaceae was globose and monosulcate, with a reticulate-columellar exine, smooth muri, and a sculptured sulcus membrane, as in Canrightia and Zlatkocarpus, all features inherited from lower in the tree (Doyle, 2005).

Phylogenetic Analyses of Cretaceous Fossils Related to Chloranthaceae and their Evolutionary Implications

Yang, "RUPTURED POLLEN GRAIN1, a member of the MtN3/saliva gene family, is crucial for exine pattern formation and cell integrity of microspores in Arabidopsis," Plant Physiology, vol.

Identification of Wheat Inflorescence Development-Related Genes Using a Comparative Transcriptomics Approach

Regarding to figure 4, (a) shows an oval homogeneous morphology without fissures, while (b) differs in being circular and having three wade edges in the primary wall, although in these morphologies is evident a well-defined structure where exine is highlighted.

Evaluacion de la digestibilidad y disponibilidad de nutrientes del polen apicola al aplicar diferentes pretratamientos

The apocolpium (t) of Cornus mas's pollen grains ranges from 3.97 to 5.85 [micro]m and their exine thickness (Ex) ranges from 0.99 to 1.77 [micro]m.

Pollen morphology of Cornus mas L. and Cornus sanguinea L

Description:Pollen grain, monocolpate, amb oblong to oval elliptical, extremities rounded or blunt, colpus distinct, extending full length of grain, colpus broad in middle with sharp ends, usually marked by parallel, exinal folds on sides, folds Plano convex or biconcave in some cases additional intexinal folds may accompany the major folds, exine laevigate, 1.5 m thick.

SOME MIOSPORES FROM THE EARLY PERMIAN TOBRA FORMATION, SALT RANGE, PAKISTAN

Notably, the pollen grains of Passiflora typically have large amounts of lipophilic substances associated with exine (SOUZA et al., 2004) in the form of large drops (exudate) or with a fibrillar aspect between the free columellae of the reticulum, called pollenkitt (Figure 2F).

In vitro pollen germination and pollen viability in passion fruit (Passiflora spp.)/ Germinacao de polen in vitro e viabilidade polinica em maracujazeiro (Passiflora spp.)

Pollutants make the surface of the exine more fragile, triggering a mucosal reaction and making them more exposed to pollen allergens.

Allergic conjunctivitis--does urbanization influence?

The pollen grains are light yellow, sticky, tricolporate with smooth exine and 66.4 [micro]m in size (Fig.

Entomophily, ornithophily and anemochory in the highly self-incompatible Boswellia ovalifoliolata Bal. & Henry (Burseraceae), an endemic and endangered medicinal tree species

The exine is intectated with a scabrate or microgemate sculpturing (MOORE & al., 1991; Beug, 2004), and is very sensitive to corrosion (HAVINGA, 1964, 1967), so it is not a very common taxon in pollen records.

Holocene history of Taxus baccata in the Basque Mountains (Northern Iberian Peninsula)/Historia holocena de Taxus baccata en las Montanas Vascas (Norte de la Peninsula Iberica)

Mature pollen grain size, exine sculpturing, and number of pores are the most distinctive features [6, 7].

Identification, characterization, and palynology of high-valued medicinal plants

18th Ave., for Exine Anderson Bailey, a retired UO music professor and one of the first soloists to perform with the Oregon Bach Festival.