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Plant and Cell Physiology, 1970, Vol. 11, No. 4 609-619
© 1970

Article

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

M. G. CLINE1 and A. O. AGATEP

Division of Biology, California Institute of Technology Pasadena, California 91109, U.S.A.

Two strongly differentiated climatic races of the Mimulus cardinalis-lewisii complex were grown at a variety of temperatures (3–27°C) and photoperiods (8 and 16 hr) under controlled environmental conditions. M. cardinalis (the lowland race, 400 m) and M. lewisii (the sub-alpine race, 3200 m) were found to differ in their physiological responses to the varied environments in several significant ways: 1) At 27°C (16 hrphotoperiod), 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°C in M. cardinalis; 3) At low temperatures (7–15°C), 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 photoperiodic tolerance than has the sub-alpine race. Applications of gibberellic acid to rosette Mimulus plants under non-inductive conditions (15°C, 8 hr photoperiod) promoted vigorous stem elongation without flowering. The application of steroids, other hormones and metabolites had no observable effects.

1Present address: Faculty of Botany, Ohio State University, Columbus, Ohio, U.S.A.

(Received March 16, 1970; )
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