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Published in Crop Sci 12:206-208 (1972)
© 1972 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Effect of Tillering and Cool Nights on Photosynthesis and Chloroplast Starch in Pangola1

N. J. Chatterton, G. E. Carlson, W. E. Hungerford and D. R. Lee2

Clonal propagviles of Digitaria decumbens Stent. were given night-temperature treatments of 30, 10, 8, and 6 C, with day temperatures of 30 C. Chloroplasts of actively tillering plants accumulated little starch and NCE (net carbon dioxide exchange) rates showed no effect of cool nights. However, chloroplasts of nontillering plants accumulated starch during the day. When night temperatures were cool translocation was apparently reduced and the starch remained within the chloroplasts. The greater chloroplast starch content of nontillering plants after cool nights was negatively correlated (1% level) with NCE rates. Plants developing new tillers and therefore possessing large assimilate sinks had faster NCE rates than nontillering plants.

Key Words: Growth reduction • Digitaria decumbens • Temperature

1 Contribution from (he Plant Science Research Division, Agricultural Research Service, USDA, Beltsville, Md. 20705.

2 Plant Physiologist, Research Agronomist, and Agricultural Research Technicians, respectively. PSRD, ARS, USDA, Beltsville, Md. 20705.

Received for publication September 10, 1971.




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