Aspen Bibliography

Ejection and dissemination of ascospores of Hypoxylon pruinatum

Document Type

Article

Journal/Book Title/Conference

Canadian Journal of Botany

Volume

45

Issue

9

First Page

1507

Last Page

1517

Publication Date

1967

Abstract

The duration of ejection of ascospores of Hypoxylon pruinatum was dependent on the moisture condition of perithecial stromata, which in turn was affected by relative humidity and air temperature. Times of peak spore collection were usually correlated with times of high relative humidity and low air temperature, but when stromata were kept moist, peak spore collections occurred on a 12-h cycle regardless of relative humidity and air temperature, presumably because of overcrowding of perithecia with spores. Felling aspen bearing Hypoxylon cankers did not significantly reduce the numbers of spores liberated from these cankers until after 23 months. Eradicating cankers from an isolated aspen stand over a several year period did not reduce the number of new infections in that stand because cankers overlooked in the surveys continued to liberate spores, and probably because spores were brought in by wind from outside the stand. The pattern of ascospore movement in a deciduous forest was traced from a known source and the significance of this movement in relation to long distance dissemination is discussed.

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