Intra- and inter-populational variation of Imperata cylindrica var. koenigii on Kii-Ohshima Island of Japan.

概要

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To clarify the variation in intra- and inter-populations of I. cylindrica var. koenigii on Kii-Ohshima Island, the plant size, morphology, pollen fertility, and seed set were investigated in 11 populations. Five clones well separated each other within each population were collected. Five ramets of each clone, a total of 275 ramets were planted in about 6000cm3 pots filled with clay loam on June 10, 1983. The seed set in the natural population was investigated for three years, from 1982 to 1984.The seed set percentage in the natural populations greatly varied among populations and among the three years. The value of the foredune population was very low, 0.10 to 0.46%, because of male sterility. That of the other ten populations ranged from 1.05 to 59.07%, though the pollen fertility of each population reached 94.08 to 99.15%.Under a cultivated condition, the seed set percentage of bagged panicles varied 0.00 to 0.35% and 100 kernel weight was 11.07 to 13.15mg. The five clones did not differ within a population in plant length, total dry matter weight, the number of shoots, the total rhizome length, the weight of 1cm length rhizome, anther size and dry matter partitioning ratio to rhizome, though significant differences were obtained among populations. The variability was smaller within the foredune population than in the other ten populations.
日本雑草学会の論文