Abstract
ABSTRACT Background : Airborne Cryptomeria japonica pollen has been detected from July to September, after the main pollen dispersal season (during florescence), in Toyama and Niigata prefectures, Japan. Methods : To identify the source of the pollen, two possible pathways were investigated: (i) secondary pollen dispersal from the ground; and (ii) release from male flowers remaining on the tree crown in C. japonica forests. Results : Secondary pollen dispersal from the ground ceased just after the main pollen dispersal season ended. However, male flowers remained on the crown until the end of September and released significant amounts of pollen, which contained as much allergenic Cry j 1 as normal pollen dispersed during the spring. There is a significant positive correlation between airborne pollen counts in the spring (February-May) and summer (June-September). Conclusions : These results indicate that the main sources of airborne pollen grains during the summer are male flowers remaining on the tree crown after their florescence.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
