若いクサギ植栽群落における花粉生産

概要

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We measured the annual production rates of Clerodendrum trichotomum pollen grains in a young C. trichotomum plantation in the nursery of the Kyoto Prefectural University Campus, Kyoto. Pollen production rates were determined on a land-area basis from the number of 4-staminate flowers/corollas that opened in the study community and the mean number and dry weight of pollen grains contained in the flowers before pollen release. The mean number of pollen grains per stamen was 3,459. The mean dry weight of pollen per stamen determined from the difference between the mean weight of anthers before and after pollen release was 0.4311mg, giving a mean single pollen grain dry weight of 125×10^<-6>mg. The mean numbers and dry weight of pollen grains per flower were 13,840 and 1.724mg, respectively, for the four stamens borne by each flower. The ratio of pollen grain number to a single ovule was calculated to be 3,459 grains, as there were 4 ovules per flower. In 2003 the yield of opened flowers per 1m^2 land area of the study community, measured using litter traps plus the clipping method at the end of the study, was 1,585.0/m^2. Therefore, the rates of pollen grain production by this C. trichotomum community in terms of grain number and dry weight were estimated to be 21.9×10^6/m^2 and 2.73g/m^2, respectively.
2005-12-31