Relationship between pollen production and airborne pollen dispersal for grass species in Morioka city center

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  • 盛岡市中心部におけるイネ科植物の花粉生産量と空中飛散花粉の関係
  • モリオカシ チュウシンブ ニ オケル イネカ ショクブツ ノ カフン セイサンリョウ ト クウチュウ ヒサン カフン ノ カンケイ

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Abstract

To estimate the composition of grass species represented in airborne pollen dispersed during the spring and early summer, daily pollen production of grass species was compared with daily pollen dispersal in central Morioka (39°42'N, 141°09'E), in 2007. Initially a count of the number of flowering heads for each of the ten species observed was undertaken at each of the five investigation sites every 3-4 days. From these counts, daily pollen production was calculated by multiplying the number of heads, number of florets per head, number of anthers per floret, and number of pollen grains per anther. The results show that the seasonal pattern of pollen production coincides with that of pollen dispersal collected with Durham samplers. From mid April to mid May the rate of pollen dispersal was low, but from mid May pollen dispersal increased rapidly, peaking from late May until mid June, subsequently decreasing in early July. The main grass species in the early stage of pollen dispersal was identified as Sweet Vernal Grass (Anthoxanthum odoratum L.). While, respectively, during the early to late stages of the pollen dispersal peak, Orchard Grass (Dactylis glomerata L.) and Tall Fescue (Festuca arundinacea Schreb.) were identified. However, the seasonal pattern of pollinosis cases for 2007 did not entirely coincide with the seasonal pollen dispersal pattern. 71% of the total number of patients reported for 2007 suffered only during the early stage of pollen dispersal. Thus it was indicated that the pollen of Anthoxanthum odoratum was strongly associated with the symptoms of Gramineae pollinosis.

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