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Published in Crop Sci 18:443-446 (1978)
© 1978 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Gibberellin Studies with Sugarcane. I. Cultivar Differences in Growth Responses to Gibberellic Acid1

P. H. Moore and L. L. Buren2

The lowered radiation and temperatures of the subtropical winter season induce a physiological dwarfism in sugarcane (Saccharum spp.). This reduction in growth can be overcome to increase yields by application of gibberellic acid (GA3).

In Hawaii, cultivars are commercially developed for culture in specific environmental zones defined by their mean daily radiation. In this study, cultivars selected for culture under leeward conditions of high radiation and temperatures were more dwarfed by the adverse winter conditions and gave a greater response to GA3 than did cultivars selected for culture under the lower radiation and temperatures of higher elevations and windward zones.

Key Words: Growth regulators • Sugarcane yields • Physiological dwarfism • Mean daily radiation • Saccharum

1 Contribution from the ARS, USDA, and the Hawaiian Sugar Planters' Assoc. Exp. Stn., Aiea, HI 96701. Published with the approval of the Director as Paper No. 408 in the Journal Series of the Exp. Stn., Hawaiian Sugar Planters' Assoc.

2 Plant physiologst, ARS, USDA, Hawaiian Sugar Planters' Assoc., Aiea, HI 96701 and associate agronomist, Present address: Stauffer Chemical Company, Sunnyvale, CA 94087.

Received for publication March 14, 1977.




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