人為四倍体アカマツの花粉の形態と稔性

概要

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A tetraploid plant of Japanese red pine (Pinus densiflora SIEB. et ZUCC.), which was induced by the seed treatment method with 0.3% colchicine solution in 1950.Pollens of the tetraploid plant were compared with those of the diploid plants.Pollen grains of the tetraploid plant were larger than those of diploid plants in size.37.3% of the pollen of the tetraploid plant had from 3 to 5 air-sacs, as shown in Table 2,whereas in the diploid plants such ones were not hardly observed.The pollen with 4 or 5 air-sacs had 1 or 2 nuclei and perfect or imperfect partition wall was formed in the centre of the pollen grain. These pollens seemed to be induced by irregularity on meiosis. However, from the facts that the pollen with 3 air-sacs appeared as many as 35.3% and was normal on the appearance, it may be supposed that the number of air-sac was related to increment of cytoplasm.The pollen fertility of the tetraploid plant was lower than that of the diploid plants. Some irregularities as to the behavior of chromosomes, which were frequently observed at first or second meiotic anaphase and telophase, are supposed as among the causes of the lower fertility.
日本森林学会の論文
1953-08-25