Respiration of Grand Rapids lettuce (Lactuca sativa L.) seeds in relation to chemical and photocontrol of germination

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A 10-min irradiation with red light (R) of 'Grand Rapids' Lettuce (Lactuca sativa L.) seeds increased respiratory rates (QO_2 and QCO_2) over those of far red (FR)-irradiated seeds within 2 to 3 hr. Differences in respiration between R- and FR-irradiated seeds became more pronounced with time. The respiration, in darkness at 25℃, of seeds air dried after germination promoting impregnation treatments with 1.0 mM GA_3+0.5 mM kinetin in acetone was stimulated slightly by the 6th hour after planting and markedly by the 12th and 24th hour. Results with seeds in GA_3+kinetin dissolved in water were similar. ABA, which inhibits germination and seedling growth, prevented stimulation in respiration of light-induced seeds. ABA also repressed respiration when used with GA_3+kinetin. The germination and growth retardant, isopropyl N-(3-chlorophenyl) carbamate (CIPC), did not affect the respiration of either R- or FR-treated seeds. A comparison of the effects of chemical and light treatments on respiration indicate that chemical and photocontrol mechanisms are not identical.
日本植物生理学会の論文