ISHS Acta Horticulturae 137: Growth Regulators, XXI IHC
FRUIT SET AND DEVELOPMENT OF THREE PEAR SPECIES INDUCED BY GIBBERELLINS |
| Authors: | E. Yuda, M. Hirakawa, S. Nakagawa, I. Yamaguchi, N. Murofushi, N. Takahashi |
| Abstract:
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. | |
Download Adobe Acrobat Reader (free software to read PDF files) | |
