Effect of Tillering and Cool Nights on Photosynthesis and Chloroplast Starch in Pangola1

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Abstract
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.

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