Effect of Rate of Photosynthesis on the Pattern of Assimilate Distribution in the Graminaceous Plant |
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Authors: | RYLE, G. J. A. POWELL, C. E. |
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Abstract: | Infrared gas analysis and a quantitative radiocarbon tracertechnique were used to measure photosynthesis and the distributionof 14C-labelled assimilate in Lolium temulentum and a uniculmbarley exposed continuously or intermittently to contrastinglight intensities. Plants grown for 1020 d in low light(<50 W m2 of visible light) exported a greater proportionof their assimilate to growing leaves at the terminal meristemand a smaller proportion to their roots and tillers than equivalentplants in high light (150 W m2). A single day's exposure(8.4 h photoperiod) to a contrasting light regime elicited achange in the pattern of assimilate distribution in the samediurnal period, but 23 d exposure was required for asubstantial shift in the pattern of supply of assimilate tomeristems. The data indicated that in terms of assimilate distributioncomplete adaption to a new light regime is attained in about7 d. |
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