Insights into a hydration regulating system in Cupressus pollen grains

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Insights into a hydration regulating system in Cupressus pollen grains.

BACKGROUND AND AIMS Hydration, rupture and exine opening due to the sudden and large expansion of intine are typical of taxoid-type pollen grains. A hemispheric outgrowth external to the exine was observed on Cupressus and Juniperus pollen grains before the intine swelling and exine release. However, the actual existence of this permanent or temporary structure and its precise role in pollen hy...

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Pollen-stigma interactions in Brassica. IV. Structural reorganization in the pollen grains during hydration.

With the aid of osmium tetroxide vapour, dry pollen and pollen at various stages of hydration has been fixed anhydrously for examination with the transmission electron microscope (TEM). In addition to establishing features characteristic of grains at different states of hydration, this technique has enabled the detection of a superficial layer investing both the exine and the pollen coating. Th...

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Pollen-stigma interaction in Brassica. III. Hydration of the pollen grains.

A method is described by which the changes in shape that accompany hydration of Brassica pollen grains may be rapidly measured. Using this technique it has proved possible to chart the small amount of hydration that takes place on anthesis, in addition to the response of pollen to a range of relative humidities in vitro and in vivo. Such measurements, together with pollen transfer experiments, ...

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The Most Common Allergenic Tree Pollen Grains in the Middle East: A Narrative Review

Allergy is becoming a major disease burden globally. Pollens are considered as the main component of aeroallergens that lead to rhinitis and asthma. Due to the lack of a comprehensive investigation on most allergic pollens of trees in the Middle East, the present study aimed to conduct a comprehensive literature review on this topic. The main goal of the study was to provide a checklist for all...

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ژورنال

عنوان ژورنال: Annals of Botany

سال: 2011

ISSN: 1095-8290,0305-7364

DOI: 10.1093/aob/mcr144