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Relations of Photosynthetic Rates and Leaf and Canopy Characters to Sugarcane Yield¹

Simple correlations showed photosynthetic rates at low air velocities to be closely associated with leaf width, porosity, and specific leaf weight, and less closely associated with stomatal number, plant fresh weight, and, probably spuriously, leaf thickness. Photosynthetic rates/unit of leaf area did not increase with increasing yield, and selection of cultivars for these or for leaf characters related to high photosynthetic rates would be of little practical value to the sugarcane (Saccharum sp.) breeder. Photosynthetic rates/unit of land area are more likely to be related to yield. Leaf-area index was positively associated with tonnage in two field tests. Leaf arrangement was associated with higher sugar/metric ton in one test, but not in a second. Selection by breeders for higher leaf-area indices and for optimum leaf arrangement is recommended.

Key Words: Leaf-area index • Porosity • Canopy • Stomata • Sugar yields

² Plant physiologist, U.S. Sugarcane Lab., ARS, USDA, Houma, LA 70360.

Received for publication November 18, 1974.

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