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Sink-Source Relations in Cassava: Effects of Reciprocal Grafting on Yield and Leaf Photosynthesis

Published online by Cambridge University Press:  03 October 2008

Didier Pellet  and
Mabrouk A. El-Sharkawy
Didier Pellet
Affiliation:
Centro International de Agricultura Tropical (CIAT), AA 6713, Cali, Colombia
Mabrouk A. El-Sharkawy
Affiliation:
Centro International de Agricultura Tropical (CIAT), AA 6713, Cali, Colombia
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Summary

Two contrasting clones of cassava (Manihot esculenta) were reciprocally grafted to test the hypothesis that the yield of cassava is limited by the number of storage roots. Effects of the root sink on leaf gas exchange were also tested under field conditions using a portable infra-red gas analyzer. Storage root number and root yield were affected by stock size and root yield was associated with the number of storage roots. The harvest index and sink-source ratio (root numberz/leaf area index) were correlated with root number. A feedback effect of root number on single-leaf photosynthesis was observed in one clone. It is concluded that the number of storage roots may be used as an indicator of sink strength.

Type
Research Article
Information
Experimental Agriculture , Volume 30 , Issue 3 , July 1994 , pp. 359 - 367
Copyright
Copyright © Cambridge University Press 1994

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