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Published in Crop Sci 13:80-81 (1973)
© 1973 Crop Science Society of America
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Effect of Photoperiod and Temperature On Rosette Habit in Safflower1

L. H. Zimmerman2

The effect of photoperiod and temperature on duration of rosette habit in safflower was evaluated. Carthamus tinctorius L. and Carthamus flavescens Spreng were grown in the greenhouse at bimonthly planting dates and in controlled environment chambers at different photoperiods and temperatures. In the greenhouse, duration of rosette habit generally increased with decrease in temperature and photoperiod except for the December plantrag. Under high temperature (20/10 C with 10 hr in the light period at 20 C and 14 hr at 10 C regardless of the photoperiod) in controlled environment rooms, rosette habit of both species persisted longer in short photoperiod (10 hr) than in long (14 hr); response proportionately greater in C. tinctorius than in C. flavescens - 68% and 11% longer duration of rosette habits, respectively. These species also responded differently to temperature. In low temperature (15/5 C) and long photoperiod (14 hr), duration of rosette habit of C. tinctorius was 13% longer than under high temperature (20/10 C) and short photoperiod (10 hr), while rosette habits were similar for these treatments in C. flavescens. In both species, genotypes responded differently to the photoperiod-temperature treatments.

Key Words: Carthamus tinctorius L. • Carthamus flavescens Spreng • Controlled environment • Genotype

1 Contribution from Plant Science Research Division, Agricultural Research Service, USDA, and Department of Agronomy and Plant Genetics, University of Arizona. Arizona Agricultural Experiment Station Journal Paper 1948.

2 Research Agronomist, PSRD, ARS, USDA, and Professor in the Department of Agronomy and Plant Genetics, University of Arizona, Tucson, Ariz. 85721.

Received for publication June 24, 1972.




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