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Role of leaf position in carbon assimilation and transport in white clover trifolium repens l


Agronomie (Paris) 7(8): 599-606
Role of leaf position in carbon assimilation and transport in white clover trifolium repens l
The authors have studied photosynthetic assimilation and assimilate transport in white clover to try to determine the role of leaf position on the establishment of source-sink relations. Short pulse labelling with 14CO2 was applied to the 8 leaves formed on stolons obtained by suckering of a stem apex. An effect of "age of the source" was shown on 14CO2 assimilation. Leaf numbers 2, 3 and 4 were the most efficient, the youngest leaf showing a low photosynthetic level and the lowest carbon assimilation rate. It was also a major sink for assimilate coming from the other leaves. Preferential source-sink relations were established between the growing apex and the young leaves. Carbon allocation to nodulated roots was due to the oldest leaves. Whatever the position of the labelled leaf, the stolon was the organ which accumulated the most newly synthesized carbon. The stolon governed carbon flow towards the apex and the nodules. We did not observed a clear positive correlation between assimilation and the transport of new carbon by the source leaf.


Accession: 006351370



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