Photoregulation of seed germination of wild-type and of an aurea-mutant of tomato |
| |
Authors: | B Lercari M Lipucci di Paola |
| |
Institution: | Dipart, di Biologia delle Piante Agrarie, Sezione di Orticoltura e Floricoltura, Univ. di Pisa, Viale delle Piagge, 23, I-56124 Pisa, Italy. |
| |
Abstract: | Seed germination of an aurea mutant of tomato ( Lycopersicon esculentum Mill.) is promoted by continuous irradiation with red, far-red or long-wavelength far-red (758 nm) light as well as by cyclic irradiations (5 min red or 5 min far-red/25 min darkness). Far-red light applied immediately after each red does not change the germination behaviour. Seed germination of the isogenic wild-type, cv. UC-105, is promoted by continuous and cyclic red light while it is inhibited by continuous and cyclic far-red light and by continious 758 nm irradiation. Far-red irradiation reverses almost completely the promoting effect of red light. The promoting effect (in the aurea mutant) and the inhibitory effect (in the wild-type) of continuous far-red light do not show photon fluence rate dependency above 20 nmol m?2 s?1. It is concluded that phytochrome controls tomato seed germination throgh low energy responses in both the wild type and the au mutant. The promoting effect of continuous and cyclic far-red light in the au mutant can be attributed to a greater sensitivity to Pfr. |
| |
Keywords: | Aurea mutant germination Lycopersicon esculentum phytochrome seeds tomato |
|
|