THE GROWTH PERCENTAGE OF POLLEN TUBES BY INTERSPECIFIC CROSSING GENUS CUCURBITA I
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概要
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The author experimented on following articles.1) Cross % in interspecies would be varieble on account of an ability of pollen pistil caused by the temperature and other conditions.2) According to the reports published up to present, set % is lower comparatively and has some difference respectively, therefore, he compared difficulty and simplicity of interspecific crossing. As the result of field experiment which was done to find the reason was not successful, he investigated by the growth ratio of pollen tubes into ovary, in the laboratory under the most suitable temperature which is considered to be the chief condition for the growth of pollen tubes and the function of pistil.3) moschata×Pepo 26.2% The growth % of pollen tubes is higher, in variety of species moschata, when _??_ crosses with Aizu line as _??_ than it does with Higata line as _??_.4) Pepo×moschata 20.5% The growth % is higher, in variety of Pepo species, when _??_ crosses with Running plant line as _??_ than it does with Bush plant line an _??_.5) Pepo×maxima 29.4%The growth % in variety of Pepo species is the same as (4).6) maxima×Pepo 37.50% The growth % is higher, in variety of maxima species, when _??_ crosses with Delicious line as _??_ thant does with Hubbard line as _??_.7) maxima×moschata 40.5% The growth % in variety of maxima species is the same as (6).8) moschata×maxima 77.4% The growth % is higher, in variety of moschata species, when _??_ crosses with Higata line as _??_ than it does Aizu line as _??_.9) The affinity of hybridity between different species brings a great difference on account of species. Even in the same species, it shows a different affinity on account of the line of different variety.
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