Abstract.
Far-red light (FR) inhibition of seed germination of tomato (Solanum lycopersicum L.) was studied with the phytochrome (phy)-hypersensitive mutants, hp-1 w, hp-1 w,fri 1, a phyA-deficient double mutant, and hp-1 w,tri 1, a phyB1-deficient double mutant. Seeds of all mutants germinated readily in the dark at 25 °C, and the germination was retarded by a single 100-s FR pulse given 1–3 h after sowing. The effect of an FR pulse was red-light reversible in all mutants used. After 24 h where a single FR pulse was no longer effective, prolonged FR exposure or hourly FR pulses suppressed germination in hp-1 w and hp-1 w,tri 1, whereas in hp-1 w,fri 1 the suppressive effect of FR was almost absent. The effect of the prolonged FR was greater than that of the hourly 3-min FR pulses having equal photon fluence, and was fluence-rate dependent. Thus we conclude that the germination inhibition by FR in tomato seed consists of a low-fluence response and a high irradiance response (HIR); the latter is controlled by phyA, but not phyB1. This is the first indication of phyA being involved in the HIR of seed germination inhibition.
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Shichijo, C., Katada, K., Tanaka, O. et al. Phytochrome A-mediated inhibition of seed germination in tomato. Planta 213, 764–769 (2001). https://doi.org/10.1007/s004250100545
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DOI: https://doi.org/10.1007/s004250100545