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Temperature and the Flowering Intensity of Ladino Clover Stolons¹

Clones of Ladino clover were grown in the greenhouse and in growth chambers to investigate the effect of temperature on flowering. Temperatures of 15, 21, or 32 C were used during photoperiodic induction. Flowering intensity was positively associated with induction temperatures. The higher temperatures increased whereas the lower decreased flowering. Temperature during the latter portion of the daily light exposure and the dark portion of the long-day cycles was found to be most critical. Air temperature at the stolon apex affected flowering more than did temperature at the expanded leaves.

Key Words: floral induction • flowering persistence

² Formerly Research Assistant (now Assistant Crop Physiologist, Department of Plant Sciences, University of Idaho, Moscow 83843) and Professor of Agronomy, University of California, Davis.

Received for publication May 22, 1967.