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Published in Crop Sci 9:794-796 (1969)
© 1969 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Effect of Photoperiod and Light Intensity on Flowering in Sugarcane1

Norman I. James and Carry A. Smith2

Photoperiods of 9, 11, and 14 hr drastically reduced the number of panicles that emerged in several sugarcane clones (Saccharum spp.), as compared to a photoperiod of 12.5 hr. A light intensity of 1399 lux tended to reduce the number of panicles that emerged more than light intensity of 86 lux when the photoperiod was 12.5 or 14 hr. The higher light intensity (1399 lux) caused significantly greater delay of panicle emergence than the lower light intensity (86 lux).

Increasing the duration of the 12.5-hr photoperiod from 0 to 12 weeks resulted in increased delay of panicle emergence; and 4 weeks of this treatment caused maximum delay when started as inflorescences were just beginning to form or were up to 1.25 cm long.

Key Words: Flower inhibition • synchronization of flowering

2 Research Agronomist and Research Geneticist (present address: Crops Research Laboratory, Colorado State University, Fort Collins, Colorado 80521), Tobacco and Sugar Crops Research Branch, Crops Research Division, U. S. Department of Agriculture, Agricultural Research Service. Canal Point, Florida 33438.

Received for publication May 12, 1969.




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Copyright © 1969 by the Crop Science Society of America.