Germination of seeds in Hyptis suaveolens Poit

概要

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Seeds of Hyptis suaveolens require long illumination periods to promote full germination, both light and dark germination being controlled by the phytochrome system. Germination in this species is inhibited both by relatively low (up to 20℃) and high temperatures (45℃). Experiments in which seeds were transferred after different periods from sub-optimal or supra-optimal temperatures to a favourable one, suggest that both high and low temperature inhibition may be explained on the basis of phytochrome action. Thus, a temperature of 20℃ induces dark dormancy due, probably, to dark reversion of phytochrome to the inactive form; whereas, at 45℃ the dominant process seems to be phytochrome decay. No phytochrome loss has been observed at 10℃. If, however, phytochrome levels are reduced by a particular treatment, no irreversible alteration is produced; seeds simply require longer illumination periods under these circumstances. A low initial concentration of phytochrome could account for the requirement of long illumination periods. Other factors affecting germination in this species, such as alternating temperatures, gibberellic acid and time of storage, arc discussed.
日本植物生理学会の論文