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Science 24 August 1984:
Vol. 225. no. 4664, pp. 801 - 808
DOI: 10.1126/science.225.4664.801
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Articles
Crop Productivity and Photoassimilate Partitioning
Roger M. Gifford 1,
J. H. Thorne 2,
W. D. Hitz 2, and
Robert T. Giaquinta 2
1 Research scientist with E. I. du Pont de Nemours & Company, Central Research and Development Department, Experimental Station, Wilmington, Delaware 19898., Division of Plant Industry, Commonwealth Scientific and Industrial Research Organization, Post Office Box 1600, Canberra City, A.C.T. 2601, Australia.
2 Research scientist with E. I. du Pont de Nemours & Company, Central Research and Development Department, Experimental Station, Wilmington, Delaware 19898.
Research Manager, Agricultural Sciences.
The photosynthetic basis for increasing the yield of major field crops is examined in terms of improving the interception of seasonal solar radiation by crop foliage, the efficiency of conversion of intercepted light to photosynthetic assimilates, and the partitioning of photoassimilates to organs of economic interest. It is concluded that, in practice, genetic and chemical manipulation of light interception over the season and of partitioning offer the most potential for achieving further increases in yield. During the history of improvement of genetic yield potential of crops, increase in the partitioning of photoassimilates to harvested organs has been of primary importance.
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