Flowering Phenology and Characteristics of Pollen Aeroparticles of <i>Quercus</i> Species in Korea
In recent decades, airborne allergens for allergic respiratory diseases have been found to increase significantly by a process of converting coniferous forests into broad-leaved forests in Korea. This study was conducted to evaluate factors, including airborne pollen counts, micromorphology, and flo...
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doaj-a8f1b32707f74f26ba4ac777563a4a7e2020-11-25T03:02:17ZengMDPI AGForests1999-49072020-02-0111223210.3390/f11020232f11020232Flowering Phenology and Characteristics of Pollen Aeroparticles of <i>Quercus</i> Species in KoreaIereh Kim0Myeong Ja Kwak1Jong Kyu Lee2Yeaji Lim3Sanghee Park4Handong Kim5Keum-Ah Lee6Su Young Woo7Department of Environmental Horticulture, University of Seoul, Seoul 02504, KoreaDepartment of Environmental Horticulture, University of Seoul, Seoul 02504, KoreaDepartment of Environmental Horticulture, University of Seoul, Seoul 02504, KoreaDepartment of Environmental Horticulture, University of Seoul, Seoul 02504, KoreaDepartment of Environmental Horticulture, University of Seoul, Seoul 02504, KoreaDepartment of Environmental Horticulture, University of Seoul, Seoul 02504, KoreaDepartment of Environmental Horticulture, University of Seoul, Seoul 02504, KoreaDepartment of Environmental Horticulture, University of Seoul, Seoul 02504, KoreaIn recent decades, airborne allergens for allergic respiratory diseases have been found to increase significantly by a process of converting coniferous forests into broad-leaved forests in Korea. This study was conducted to evaluate factors, including airborne pollen counts, micromorphology, and flowering phenology, that can affect oak pollen-related allergic symptoms. The catkin of Mongolian oak (<i>Quercus</i> <i>mongolica</i> Fisch. ex Ledeb.) showed the most rapidly blooming catkin on Julian day 104 in flower development. Among six species, the last flowering was observed on Julian day 119 in Korean oak (<i>Quercus</i> <i>dentata</i> Thunb.). The pollen dispersal was persisted for about 32 days from Julian day 104 to Julian day 136. Airborne pollen was observed about 2 weeks after flowering phase H, the senescence phase. Pollen size varied by species, with the largest from <i>Q. mongolica</i> (polar axis length, PL = 31.72 µm, equatorial axis length, EL = 39.05 µm) and the smallest from Jolcham oak (<i>Quercus</i> <i>serrata</i> Murray) (PL = 26.47 µm, EL = 32.32 µm). Regarding pollen wall structure, endexine of <i>Q. dentata</i> was coarsely laminated or fragmented. The endexine thicknesses of Sawtooth oak (<i>Quercus</i> <i>acutissima</i> Carruth.) and <i>Q. serrata</i> were thick and stable, whereas Galcham oak (<i>Quercus</i> <i>aliena</i> Blume), <i>Q. mongolica</i>, and Oriental cork oak (<i>Quercus</i> <i>variabilis</i> Blume) had thinner endexines. The area occupied by pollenkitt of <i>Q. variabilis</i> was significantly larger than that of <i>Q. acutissima</i>. Importantly, <i>Q. variabilis</i> had a distinctly thick 17 kDa protein band, a presumed major allergen. Oak species differ in pollen protein composition, and thus there is a possibility that the allergenic activity of pollen proteins vary depending on oak species. This study highlights the fact that native oak species in Korea differ in flowering pattern of male flowers, pollen morphology, and pollen chemical constituents. These discrepancies in flowering and pollen properties imply variable allergic responses to oak pollen from different species.https://www.mdpi.com/1999-4907/11/2/232aeroparticlesallergenphenologypollen grainspollenkitt<i>quercus</i> spp. |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Iereh Kim Myeong Ja Kwak Jong Kyu Lee Yeaji Lim Sanghee Park Handong Kim Keum-Ah Lee Su Young Woo |
spellingShingle |
Iereh Kim Myeong Ja Kwak Jong Kyu Lee Yeaji Lim Sanghee Park Handong Kim Keum-Ah Lee Su Young Woo Flowering Phenology and Characteristics of Pollen Aeroparticles of <i>Quercus</i> Species in Korea Forests aeroparticles allergen phenology pollen grains pollenkitt <i>quercus</i> spp. |
author_facet |
Iereh Kim Myeong Ja Kwak Jong Kyu Lee Yeaji Lim Sanghee Park Handong Kim Keum-Ah Lee Su Young Woo |
author_sort |
Iereh Kim |
title |
Flowering Phenology and Characteristics of Pollen Aeroparticles of <i>Quercus</i> Species in Korea |
title_short |
Flowering Phenology and Characteristics of Pollen Aeroparticles of <i>Quercus</i> Species in Korea |
title_full |
Flowering Phenology and Characteristics of Pollen Aeroparticles of <i>Quercus</i> Species in Korea |
title_fullStr |
Flowering Phenology and Characteristics of Pollen Aeroparticles of <i>Quercus</i> Species in Korea |
title_full_unstemmed |
Flowering Phenology and Characteristics of Pollen Aeroparticles of <i>Quercus</i> Species in Korea |
title_sort |
flowering phenology and characteristics of pollen aeroparticles of <i>quercus</i> species in korea |
publisher |
MDPI AG |
series |
Forests |
issn |
1999-4907 |
publishDate |
2020-02-01 |
description |
In recent decades, airborne allergens for allergic respiratory diseases have been found to increase significantly by a process of converting coniferous forests into broad-leaved forests in Korea. This study was conducted to evaluate factors, including airborne pollen counts, micromorphology, and flowering phenology, that can affect oak pollen-related allergic symptoms. The catkin of Mongolian oak (<i>Quercus</i> <i>mongolica</i> Fisch. ex Ledeb.) showed the most rapidly blooming catkin on Julian day 104 in flower development. Among six species, the last flowering was observed on Julian day 119 in Korean oak (<i>Quercus</i> <i>dentata</i> Thunb.). The pollen dispersal was persisted for about 32 days from Julian day 104 to Julian day 136. Airborne pollen was observed about 2 weeks after flowering phase H, the senescence phase. Pollen size varied by species, with the largest from <i>Q. mongolica</i> (polar axis length, PL = 31.72 µm, equatorial axis length, EL = 39.05 µm) and the smallest from Jolcham oak (<i>Quercus</i> <i>serrata</i> Murray) (PL = 26.47 µm, EL = 32.32 µm). Regarding pollen wall structure, endexine of <i>Q. dentata</i> was coarsely laminated or fragmented. The endexine thicknesses of Sawtooth oak (<i>Quercus</i> <i>acutissima</i> Carruth.) and <i>Q. serrata</i> were thick and stable, whereas Galcham oak (<i>Quercus</i> <i>aliena</i> Blume), <i>Q. mongolica</i>, and Oriental cork oak (<i>Quercus</i> <i>variabilis</i> Blume) had thinner endexines. The area occupied by pollenkitt of <i>Q. variabilis</i> was significantly larger than that of <i>Q. acutissima</i>. Importantly, <i>Q. variabilis</i> had a distinctly thick 17 kDa protein band, a presumed major allergen. Oak species differ in pollen protein composition, and thus there is a possibility that the allergenic activity of pollen proteins vary depending on oak species. This study highlights the fact that native oak species in Korea differ in flowering pattern of male flowers, pollen morphology, and pollen chemical constituents. These discrepancies in flowering and pollen properties imply variable allergic responses to oak pollen from different species. |
topic |
aeroparticles allergen phenology pollen grains pollenkitt <i>quercus</i> spp. |
url |
https://www.mdpi.com/1999-4907/11/2/232 |
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