49.ニホンナシにおける自家摘果性機構の解析(口頭発表)  [in Japanese] 49. Mechanism of the fruit self-thinning trait of Japanese pear  [in Japanese]

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Abstract

To grow Japanese pears in big size and with high quality, it is necessary to restrict the number of flowers. Usually, Japanese pears bear six to eight flowers within a flower cluster. It is known that some of the cultivars, Chojuro, Niitaka, Akiakari and a breeding line, 162-29 show fruit self-thinning, that is active dropout of several to many flowers (fruits) within a cluster in two to four weeks after anthesis. Until now however, the mechanism of the fruit self-thinning was rarely investigated. Thus we analyzed how the fruit self-thinning occurred, in detail. We also analyzed whether the levels of the two plant hormones, auxin and abscisic acid participate in the fruit self-thinning action. The average number of the flowers after the fruit self-thinning was approximately four both in Chojuro and 162-29, however the position of the remained flowers/fruits was random in Chojuro, while in 162-29, it was determined by the order of the pollination. These results suggest that the regulation of the number and the position of the remained flowers/fruits was independent from the fruit self-thinning action. The levels of auxin and abscisic acid were up-regulated and down-regulated, respectively, in fruit self-thinning variety 162-29 as compared to non-fruit self-thinning cultivar Kosui. The result implicates that the change of the levels of the two hormones, auxin and abscisic acid was involved in the mechanism of fruit self-thinning action.

Journal

  • The Janapese Society for Chemical Regulation of Plants, Abstract

    The Janapese Society for Chemical Regulation of Plants, Abstract 43(0), 63, 2008

    The Janapese Society for Chemical Regulation of Plants

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