Light and temperature control of germination in Agropyron smithii seeds

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In darkness, A. smithii seeds germinated poorly at constant temperatures but well at alternating temperatures. Prolonged periods on the high part of the temperature cycles reduced germination; the higher the temperature the shorter was the period required on the high part of the temperature cycles for optimum germination. Continuous, unfiltered, incandescent illumination and intermittent far red at 15°-25℃ alternation also inhibited germination; the inhibitory effects were similar to those caused by the high intensity reaction. Far red inhibited germination when applied after 1 and 2 complete 15°-25℃ cycles in darkness but not after 3 cycles. Less than 20% of the seeds were under phytochrome control at constant 20℃. When red light was applied directly after far red that was applied in intermittent cycles at 15°-25℃, however, 50% of the seeds caused to germinate by the alternating temperature were shown to be controlled by the reversible phytochrome reaction. The induced high-temperature dormancy was overcome by gibberellic acid (GA_3) plus kinetin. The hormonal treatment was much more effective than light for breaking dormancy. Inhibition from prolonged illumination was alleviated or eliminated by GA_3+kinetin. The failure of red light to promote good germination at 20℃ was also overcome with GA_3+kinetin; effects of light plus the hormone treatments were more than additive. These data suggest that optimum alternating temperatures facilitate a proper balance and interaction of hormones, enzymes, substrates and possibly preexistent P_<fr> so that the germination of A. smithii seeds can proceed without benefit of a light treatment.
日本植物生理学会の論文
1976-12-00

Light and temperature control of germination in Agropyron smithii seeds

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