Temperature and photoperiodic control of developmental responses in climatic races of Mimulus

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Two strongly differentiated climatic races of the Mimulus cardinalis-lewisii complex were grown at a variety of temperatures (3-27℃) and photoperiods (8 and 16 hr) under controlled environmental conditions. M. cardinalis (the lowland race, 400m) and M. lewisii (the sub-alpine race, 3200m) were found to differ in their physiological responses to the varied environments in several significant ways: 1) At 27℃ (16 hr photoperiod), M. lewisii sustained 100% mortality in contrast to the substantial growth and flowering of M. cardinalis under these conditions; 2) In 8 hr photoperiods at all temperatures, there was little growth and no flowering in M. lewisii whereas there was considerable growth at all temperatures, and flowering at 23 and 27℃ in M. cardinalis; 3) At low temperatures (7-15℃), 16 hr photoperiods, flowering occurred a week or two earlier in M. lewisii than in M. cardinalis. The lowland race has a significantly wider temperature and photo-periodic. tolerance than has the sub-alpine race. Applications of gibberellic acid to rosette Mimulus plants under non-inductive conditions (15℃, 8 hr photoperiod) promoted vigorous stem elongation without flowering. The application of steroids, other hormones and metabolites had no observable effects.
日本植物生理学会の論文