FRUIT SET AND DEVELOPMENT OF THREE PEAR SPECIES INDUCED BY GIBBERELLINS

E. Yuda, M. Hirakawa, S. Nakagawa, I. Yamaguchi, N. Murofushi, N. Takahashi
Parthenocarpy was readily induced in two cultivars of Japanese pear when GA4+7 (500 ppm) in combination with or without other plant growth substances were applied on the emasculated and decapitated (stigma removed) flowers in full bloom and 3 weeks after. While GA3 did not induce parthenocarpy in these cultivars. Gibberellin was not necessary for the second treatment (3 weeks after bloom), but could be replaced with NAA and/or BA. The parthenocarpic fruit was small and generally elongated-obovoid, different from the round seeded fruit. Parthenocarpic fruit set of European pear induced by GA3, GA4+7 or GA45 was 42, 45 and 46%, respectively.

The identification of endogenous GA-like substances in the immature seeds of these pear species detected by the rice seedling test or barley half-seed test was conducted through high pressure liquid chromatography (HPLC) and selected ion monitoring (GC-SIM). Only GA3 was identifified in the immature seeds of 3 pear species.

Yuda, E., Hirakawa, M., Nakagawa, S., Yamaguchi, I., Murofushi, N. and Takahashi, N. (1983). FRUIT SET AND DEVELOPMENT OF THREE PEAR SPECIES INDUCED BY GIBBERELLINS. Acta Hortic. 137, 277-284
DOI: 10.17660/ActaHortic.1983.137.31
https://doi.org/10.17660/ActaHortic.1983.137.31

Acta Horticulturae