Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 12:621-623 (1972)
© 1972 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Suboptimal Temperature and Assimilate Accumulation in Leaves of ‘Pangola’ Digitgrass (Digitaria decumbens Stent.)1

L. A. Garrard and S. H. West2

This study was conducted to determine the effect of metabolic sink activity on mobilization at low temperature of chloroplast starch in a tropical grass. Entire plants or partially shaded plants of ‘Pangola’ digitgrass (Digitaria decumbens Stent.) accumulated photosynthate during a 12-hr period of illumination of 30 klux at 30C. Plants were then either entirely or partially subjected to a suboptimal temperature of 10C for a dark period of 12 hr. Temperature treatments provided metabolic sinks at 30C in locations proximate to areas containing low temperature- immobilized assimilate. Distribution of reducing sugar, sucrose, and starch was determined. No evidence was found that the presence of active metabolic sinks negated the influence of suboptimal temperature in causing assimilate immobilization. Further, the action of suboptimal temperature in causing assimilate immobilization appeared to be located at the area of accumulation, the leaf or perhaps the chloroplas.

Key Words: Translocation • Mobilization • Metabolic sink • Photosynthate • Starch • Sucrose • Reducing sugar

1 Florida Agricultural Experiment Station Journal Series No. 4338.

2 Associate Plant Physiologist, Agronomy Department, University of Florida and Plant Physiologist, Plant Science Research Division, Agricultural Research Service, U. S. Department of Agriculture, and Department of Agronomy, University of Florida, Gainesville, Florida 32601.

Received for publication March 13, 1972.




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