Cucurbita-crosses. VI. Relationship between pollen ages and the optimum conditions (saccharose concentrations and pH values), of the artificial media.

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  • 南瓜属の交雑に関する研究 : VI.花粉の成熟に伴う発芽床の最適条件(蔗糖濃度とpH)の変化

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1. Cross-compatibility in three cultivated cucurbita species varies when crossed reciprocally. In order to study the cause of this phenomenon, the authors attempted to investigate the physiology of pollen germination on the artificial media and the influence of stigmata or ovules of different species upon polleh germination. 2. The optimum condition of artificial media for pollen germination varies with different pollen ages during the period from the afternoon of the day before anthesis to the noon of flowering day. 3. Pollen germination increases as pollen maturates. The optimum pH for pollen germination undergoes the following change : weak acid-weak alkali-weak acid-acid. 4. The gtowth rate of pollen-tubes is classified into twelve groups according to the mixing ratio of short, middle and long pollen-tubes. 5. The viability index of pollen has been obtained from the following fcrmula : (Germination rate of pollen) x (Growth rate of pollen-tubes) x 1/100. 6. The highest viability index of pollen by the pH experiment of C. maxima has been observed at pH 5.6 of 2 a.m. (Table 3). 7. The optimum saccharose concentrations of artificial media changes with different pollen ages from high to low percentages (Table 4, 5 and 6).

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